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    Wyświetlanie 1-14 z 14
    Tytuł:
    The Role of Microstructure in High Temperature Tribology of Iron Alloys
    Autorzy:
    Krawczyk, J.
    Rożniata, E.
    Zimowski, S.
    Kot, M.
    Dąbrowski, R.
    Dziurka, R.
    Frocisz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/355366.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    tribology
    iron alloys
    cast steel
    wear
    cementite
    Opis:
    The present paper describe the issue of tool materials wear in a high temperature conditions. The investigations were performed at the cast steel tool material at the tribological contact to the structural steel. The investigations aim was to determine the role of microstructure in a tribological properties between the structural steel and tool material. The results of such investigation could be referenced to the industry conditions and could answer about the problems of tool materials wear. The observations of the wear mechanisms were referred to the microstructure of the mill rolls. The laboratory tests ware aimed at evaluating the thermal treatment modification effect on the cast steels properties. A significant role of the morphology of ledeburitic cementite and secondary cementite on the tribological properties was exhibited. The investigations assumed the presence of an austenitic matrix with primary and secondary cementite. Influence of varying morphology carbides was described. in the cast steel microstructure. The investigation results make possible to point to a direction of carbide morphology change with the purpose of obtaining the assumed properties of hot operation tools.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 915-920
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-temperature oxidation of cast steel in water vapour
    Wysokotemperaturowe utlenianie staliwa w parze wodnej
    Autorzy:
    Zapała, R.
    Pach, S.
    Górny, M.
    Homa, M.
    Siewiorek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/391690.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    cast heat-resistant steel
    microstructure
    high-temperature corrosion
    water vapour
    staliwo żaroodporne
    mikrostruktura
    korozja wysokotemperaturowa
    para wodna
    Opis:
    The article presents the results of studies of the oxidation process conducted at 900°C for 12 hours in an atmosphere of water vapour on cast heat-resistant steel with a diversified structure (ferritic-austenitic, austenitic, and austenitic with carbides). Based on the studies of oxidation kinetics, it was found that samples were oxidized in approximation with the rules of linear law. Depending on the chemical composition and structure of tested alloys, the scale formed on the alloy surface had different properties. In the tested material characterised by a ferritic-austenitic structure, the tendency of the scale to detach from the surface of the metallic substrate was observed. It was probably due to different coefficients of the thermal expansion of austenite and ferrite.
    Praca prezentuje wyniki badań utleniania w atmosferze pary wodnej staliwa żaroodpornego o różnej strukturze (ferrytyczno-austenitycznej, austenitycznej i austenitycznej z węglikami) w temperaturze 900°C w ciągu 12 godzin. Na podstawie badań kinetyki utleniania stwierdzono, że badane próbki utleniały się w przybliżeniu zgodnie z prawem liniowym. W zależności od składu chemicznego i struktury badanych stopów obserwowano odmienne właściwości powstałych zgorzelin. W przypadku materiału o strukturze ferrytyczno-austenitycznej stwierdzono odpadanie zgorzeliny od powierzchni rdzenia metalicznego związane prawdopodobnie z różnym współczynnikiem rozszerzalności cieplnej austenitu i ferrytu.
    Źródło:
    Prace Instytutu Odlewnictwa; 2015, T. 55, nr 3, 3; 61-70
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Oxidation Property of Ni Based Superalloy CM247LC Produced Via Selective Laser Melting Process
    Autorzy:
    Lee, Jung-Uk
    Kim, Young-Kyun
    Seo, Seong-Moon
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/2203720.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-based superalloy
    selective laser melting
    directional solidification
    microstructure
    high temperature oxidation property
    Opis:
    CM247LC alloy was manufactured by using selective laser melting (SLM) process, one of the laser powder bed fusion (L-PBF) methods. The hot isostatic pressing (HIP) process was additionally conducted on the SLM-built CM247LC to control its microstructures and defects. The high temperature oxidation property was investigated, and it was compared with conventional DS247LC sample (reference) prepared via the directional solidification process. The L-PBF HIP sample showed blocky-type MC carbides generated along the grain boundary with average size of about 200 nm. A semi-spherical primary γ' phase of size 0.4-1.0 μm was also observed inside the grains. Moreover, the DS247LC sample displayed a coarse eutectic γ' phase and many script-type MC carbides. Furthermore, cuboidal-type γ' with an average size of about 0.5 μm was detected. High-temperature oxidation tests were conducted at 1000°C and 1100°C for 24 hours. The results at 1100°C oxidation temperature showed that the measured oxidation weight gains for HIP and DS247LC were 1.96 mg/cm2 and 2.26 mg/cm2, respectively, indicating the superior high-temperature oxidation resistance of the L-PBF HIP sample. Based on the above results, a high-temperature oxidation mechanism of the CM247LC alloys manufactured by the SLM process and the directional solidification process has been proposed.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 107--112
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Chemical Composition of Fe-Cr Alloy Tempered in High Temperature and Atmosphere Containing Ar-SO2
    Autorzy:
    Radziszewska, A.
    Kranzmann, A.
    Dörfel, I.
    Mosquera Feijoo, M.
    Solecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354072.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    high-temperature corrosion
    X20Cr13 steel
    Opis:
    The paper presents the microstructure, chemical and phase composition of thin scale, obtained as a result of high-temperature corrosion of X20Cr13 stainless steel. Samples were exposed to gas atmosphere of the following composition: 0.25 vol.% of SO2 and 99.75 vol.% of Ar at 600 °C for 5 h. As a consequence, thin compact scale was formed on steel surface. This scale consisted of three different zones. An amorphous zone was formed close to steel surface. Then, nanocrystalline zone could be observed. Finally, larger grains were formed during the corrosion process. The analysis of the chemical composition revealed higher concentration of chromium near steel surface. In contrast, to chromium, the content of iron, increased near the scale surface. It was found out that the (Cr, Mn, Fe)5O12 phase appeared in the thin scale.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1607-1612
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and High Temperature Oxidation Properties of Fe-Cr-Ni HK30 Alloy Manufactured by Metal Injection Molding
    Autorzy:
    Wi, Dong-Yeol
    Kim, Young-Kyun
    Yoon, Tae-Sik
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/356708.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal injection molding
    HK30
    microstructure
    high temperature oxidation
    Opis:
    This study investigated the microstructure and high temperature oxidation properties of Fe-25Cr-20Ni-1.5Nb, HK30 alloy manufactured by metal injection molding (MIM) process. The powder used in MIM had a bi-modal size distribution of 0.11 and 9.19 μm and had a spherical shape. The initial powder consisted of γ-Fe and Cr23C6 phases. Microstructural observation of the manufactured (MIMed) HK30 alloy confirmed Cr23C6 along the grain boundary of the γ-Fe matrix, and NbC was distributed evenly on the grain boundary and in the grain. After a 24-hour high temperature oxidation test at air atmospheres of 1000, 1100 and 1200°C, the oxidation weight measured 0.72, 1.11 and 2.29 mg/cm2, respectively. Cross-sectional observation of the oxidation specimen identified a dense Cr2O3 oxide layer at 1000°C condition, and the thickness of the oxide layer increased as the oxidation temperature increased. At 1100°C and 1200°C oxidation temperatures, Fe-rich oxide was also formed on the dense Cr2O3 oxide layer. Based on the above findings, this study identified the high-temperature oxidation mechanism of HK30 alloy manufactured by MIM.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 525-530
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Welded Joints Structure of the Inconel 617 Alloy Designed for High Temperature Operation in Supercritical Parameters Boilers
    Autorzy:
    Adamiec, J.
    Konieczna, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/353494.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Inconel 617
    nickel alloys
    welded joint
    macrostructure
    microstructure
    etching
    TIG method
    Opis:
    The development of power industry obligates designers, materials engineers to create and implement new, advanced materials, in which Inconel 617 alloy is included. Nowadays, there are a lot of projects which describe microstructure and properties of Inconel 617 alloy. However, the welded joints from mentioned material is not yet fully discussed in the literature. The description of welded joints microstructure is a main knowledge source for designers, constructors and welding engineers in estimating durability process and degradation assessment for elements and devices with welds of Inconel 617 alloy. This paper presents the analysis and assessment of advanced nickel alloy welded joints, which have been done by tungsten inert gas (TIG). Investigations have included analysis made by light microscope and scanning electron microscope. The disclosed precipitates were identified with Energy Dispersive Spectroscopy (EDS) microanalysis, then it were done X-Ray Diffraction (XRD) phases analysis. To confirm the obtained results, a scanning-transmission electron microscope (STEM) analysis was also performed. The purpose of the article was to create a comprehensive procedure for revealing the Inconel 617 alloy structure. The methodology presented in this article will be in future a great help for constructors, material specialists and welding engineers in assessing the structure and durability of the Inconel 617 alloy.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 243-255
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Long-Term Impact of Elevated Temperature on Changes in Microstructure and Mechanical Properties of HR3C Steel
    Autorzy:
    Zieliński, A.
    Sroka, M.
    Hernas, A.
    Kremzer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353972.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HR3C steel
    high temperature aging
    microstructure
    mechanical properties
    Opis:
    The HR3C is a new steel for pressure components used in the construction of boilers with supercritical working parameters. In the HR3C steel, due to adding Nb and N, the compounds such as MX, CrNbN and M23C6 precipitate during service at elevated temperature, resulting in changes in mechanical properties. This paper presents the results of microstructure investigations after ageing at 650, 700 and 750°C for 5,000 h. The microstructure investigations were carried out using scanning and transmission electron microscopy. The qualitative and quantitative identification of the existing precipitates was carried out using X-ray analysis of phase composition. The effect elevated temperature on microstructure and mechanical properties of the examined steel was described.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 761-766
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aggregate Type Influence on Microstructural Behavior of Concrete Exposed to Elevated Temperature
    Autorzy:
    Belkadi, Ahmed Abderraouf
    Kessal, Oussama
    Bensalem, Sara
    Aggoun, Salima
    Amouri, Chahinez
    Khouadjia, Mohamed Lyes Kamel
    Powiązania:
    https://bibliotekanauki.pl/articles/27314710.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    types of aggregates
    high temperature
    compressive strength
    microstructure
    mercury porosimeter
    kruszywo
    temperatura wysoka
    wytrzymałość na ściskanie
    mikrostruktura
    porozymetr rtęciowy
    Opis:
    Exposure of concrete to high temperatures affects its mechanical properties by reducing the compressive strength, bending… etc. Factors reducing these properties have been focused on by several studies over the years, producing conflicting results. This article interested an important factor, that is the type of aggregates. For this, an experimental study on the behavior of concrete based on different types of aggregates: calcareous, siliceous and silico-calcareous subjected to high temperatures. In addition, the particle size distribution of the aggregates was chosen to be almost identical so that the latter does not affect the behavior of the concrete. Aggregates and concrete samples were subjected to a heating/cooling cycle of 300, 600 and 800°C at a speed of 1°C/ min. The mechanical and physical properties of concrete before and after exposure to high temperatures were studied. In addition, a microstructural study using a scanning electron microscope and a mercury porosimeter was performed. Thus, a comparative study between various researches on the mechanical properties of concrete exposed to high temperatures containing different types of aggregates was carried out. The compressive strength test results showed that the concrete based on siliceous aggregates (C-S) has better mechanical performance up to 300°C. However, above 300°C, the compressive strength decreases faster compared to calcareous-based concrete (C-C). According to the mercury porosimeter test, at 600°C, C-SC and C-S concretes have the highest number of pores compared to C-C concretes. The microstructure of concrete at high temperatures was influenced mainly by the aggregate’s types and the paste-aggregate transition zone. This study reinforces the importance of standardizing test procedures related to the properties of concrete in a fire situation so that all the results obtained are reproducible and applicable in other research.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 1; 19--42
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural investigations and determination of current and voltage characteristics in htsc 2G SF12050 tapes
    Badania strukturalne oraz wyznaczanie charakterystyk prwo-napięciowych dla taśm htsc 2GSF12050
    Autorzy:
    Jędryka, J.
    Szota, M.
    Nabiałek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352918.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nadprzewodniki wysokotemperaturowe
    charakterystyka prądowo-napięciowa
    prąd krytyczny
    analiza składu chemicznego
    mikrostruktura
    high-temperature superconductors
    current and voltage characteristics
    critical current
    analysis of chemical composition
    microstructure
    Opis:
    Investigations of a state-of-the art high-temperature ceramic superconducting tape of SF 12050 series are presented. The study focuses on current and voltage characteristics, examination of microstructure and analysis of chemical composition in superconducting tapes of SF series. In order to measure current parameters, a measuring system was designed to investigate sections of the tapes at the temperature of liquid nitrogen. The system is powered with direct current with parameters I= 0 ÷ 580A and U= 0 ÷ 8V. Measurements of critical current were taken by means of determination of the decline in voltage along the measurement section for the tape with accuracy of 1nV. Analysis of chemical composition was carried out using scanning microscope which features chemical composition microanalyser EDX. The paper presents microscope images which are a result of examination of the structures by means of light microscope and scanning microscope. The method of preparation of superconducting tapes for soldering and the method of selection of solder were also presented.
    W pracy zaprezentowano wyniki badań ceramicznej wysokotemperaturowej taśmy nadprzewodzacej najnowszej generacji z serii SF 12050. W artykule przedstawiono badania dotyczące wyznaczania charakterystyk prądowo-napięciowych, obserwacji mikrostruktury oraz analizy składu chemicznego taśm nadprzewodzących z serii SF. Do badań parametrow pradowych został zaprojektowany i zbudowany układ pomiarowy umożliwiający badanie odcinkow taśm w temperaturze ciekłego azotu. Układ ten jest zasilany źródłem prądu stałego o parametrach I= 0 580A oraz U= 0 8V. Pomiary prądu krytycznego sa wykonywane przez określenie spadku napięcia na odcinku pomiarowym tasmy z dokladnoscia do1 nV na odcinku pomiarowym nadprzewodnika. Analizę składu chemicznego przeprowadzono przy zastosowaniu mikroskopu skaningowego z mikro-analizatorem składu chemicznego EDX. W pracy zamieszczone zostały obrazy mikroskopowe bedace wynikiem obserwacji struktur za pomocą mikroskopu świetlnego oraz skaningowego. Przedstawiona została rownież metoda preparatyki tasmy nadprzewodzacej do lutowania oraz sposob doboru lutowia.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1045-1045
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Pouring Temperature on the Structure and Mechanical Properties of High-Chromium Cast Iron
    Wpływ temperatury odlewania na strukturę i właściwości mechaniczne żeliwa wysokochromowego
    Autorzy:
    Kopyciński, D.
    Siekaniec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382417.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high chromium cast iron
    pouring temperature
    bending strength
    cooling curves
    microstructure
    żeliwo wysokochromowe
    temperatura odlewania
    wytrzymałość
    chłodzenie
    Opis:
    The article presents the results of the influence of pouring temperature on the structure and selected properties of high-chromium cast iron. The study was performed on two different pouring temperatures 1490°C and 1460°C for cast iron of the same chemical composition. Melts were performed in the induction furnace crucible capacity of 15 kg located in the Department of Engineering Alloys and Composites in Foundry Engineering Faculty of AGH. For each temperature cast 2 sets of rollers with dimensions ø30mm, ø20mm, ø15mm x 250mm. During the heats poured cup with installed S type thermocouple to record the cooling curves. Rollers put to the static bending strength test. Samples were cut from the rollers for the test microstructure. The study shown that the pouring temperature has a significant impact on the way of crystallization of high-chromium cast iron and consequently, on the microstructure and mechanical properties. It follows that, by appropriate selection of the pouring temperature can control certain properties of the casting.
    W pracy przedstawiono wyniki badań wpływu temperatury odlewania na strukturę i wybrane właściwości wytrzymałościowe żeliwa wysokochromowego. W ramach badań wykonano dwa wytopy z różną wartością temperatury odlewania 1490 °C i 1460 °C, dla żeliwa o tym samym składzie chemicznym. Wytopy wykonano w piecu indukcyjnym o pojemności tygla 15 kg znajdującym się w Katedrze Inżynierii Stopów i Kompozytów Odlewanych na Wydziale Odlewnictwa AGH. Dla każdej temperatury odlano 2 zestawy wałków o wymiarach ø30 mm, ø20 mm, ø15 mm x 250 mm. Podczas wytopów zalano kubki pomiarowe z termoelementem typu S do rejestracji krzywej krystalizacji i stygnięcia. Wałki poddano statycznej próbie wytrzymałości na zginanie. Następnie z wałków wycięto próbki do badania mikrostruktury. Z przeprowadzonych badań wynika, że temperatura odlewania ma istotny wpływ na sposób krystalizacji odlewu z żeliwa wysokochromowego, a w konsekwencji na mikrostrukturę i właściwości wytrzymałościowe. Wynika z tego, że przez odpowiedni dobór temperatury odlewania można sterować niektórymi właściwościami mechanicznymi odlewu.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4 spec.; 63-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Deformation and Austenitization Temperature on the Kinetics of Phase Transformations During Cooling of High-Carbon Steel
    Autorzy:
    Kawulok, P.
    Podolinský, P.
    Kajzar, P.
    Schindler, I.
    Kawulok, R.
    Ševčák, V.
    Opěla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/350975.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-carbon steel
    cooling
    transformation diagrams
    microstructure
    hardness
    Opis:
    The aim of the performed experiments was to determine the influence of deformation and of austenitization temperature on the kinetics of phase transformations during cooling of high-carbon steel (0.728 wt. % C). The CCT and DCCT diagrams for austenitization temperature 940°C and DCCT diagram for austenitization temperature 1000°C were constructed with the use of dilatometric tests. On the basis of obtained results, a featureless effect of austenitization temperature and deformation on the kinetics of phase transformations during cooling of investigated steel was observed. Critical cooling rates for the transformation of martensite in microstructure fluctuated from 5 to 7°C · s-1 (depending on the parameters of austenitization and deformation), but only at cooling rates higher than 8°C · s-1 a dominant share of martensite was observed in the investigated steel, which resulted in the significant increase of hardness.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1743-1748
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of the Coiling Temperature and Anisotropy on the Tensile Properties of High-Strength API X70 Linepipe Steel
    Autorzy:
    Oh, Dong-Kyu
    Shin, Seung-Hyeok
    Lee, Sang-Min
    Hwang, Byoungchul
    Powiązania:
    https://bibliotekanauki.pl/articles/2174576.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    linepipe steels
    anisotropy
    tensile property
    texture
    microstructure
    Opis:
    In this study, the effect of the coiling temperature on the tensile properties of API X70 linepipe steel plates is investigated in terms of the microstructure and related anisotropy. Two coiling temperatures are selected to control the microstructure and tensile properties. The API X70 linepipe steels consist mostly of ferritic microstructures such as polygonal ferrite, acicular ferrite, granular bainite, and pearlite irrespective of the coiling temperature. In order to evaluate the anisotropy in the tensile properties, tensile tests in various directions, in this case 0° (rolling direction), 30°, 45° (diagonal direction), 60°, and 90° (transverse direction) are conducted. As the higher coiling temperature, the larger amount of pearlite is formed, resulting in higher strength and better deformability. The steel has higher ductility and lower strength in the rolling direction than in the transverse direction due to the development of γ-fiber, particularly the {111}<112> texture.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1487--1490
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes In Properties and Microstructure of High-Chromium 9-12%Cr Steels Due to Long-Term Exposure at Elevated Temperature
    Autorzy:
    Zieliński, A.
    Dobrzański, J.
    Purzyńska, H.
    Golański, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/351104.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steel P91
    P92
    VM12
    microstructure
    mechanical properties
    long-term annealing
    Opis:
    This paper presents the characteristics of the performance of P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) and VM12 (X12CrCoWVNb12-2-2) steels used for condition assessment of the pressure components of boilers with supercritical steam parameters. Studies on the mechanical properties, microstructure tests using scanning and transmission electron microscopy, and X-ray analysis of the phase composition of precipitates were performed for selected steels in the as-received condition and after long-term annealing. These steel characteristics are used for the evaluation of the microstructural changes and mechanical properties of the material of components after long-term service. The result of this study is the database of material characteristics representing the mechanical properties related to the microstructure analysis and it can be used for diagnosis of the components of pressure parts of power boilers.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 957-964
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Finish Rolling Temperature and Niobium Microalloying on the Microstructure and Properties of a Direct Quenched High-Strength Steel
    Autorzy:
    Kaijalainen, A.
    Vähäkuopus, N.
    Somani, M.
    Mehtonen, S.
    Porter, D.
    Kömi, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/350880.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    direct quenching
    hot rolling
    Nb microalloying
    microstructure
    CCT diagram
    Opis:
    This paper comprehends the effects of finish rolling temperature (FRT) and Nb-microalloying on the microstructural evolution and resultant properties of a low carbon direct quenched steel in the yield strength category of ≥900 MPa. Results indicate that a decrease in FRT close to Ar3 temperature significantly influenced the microstructure following phase transformation, especially at the subsurface (~50-400 μm) of the rolled strip. On decreasing the FRT, the subsurface microstructure revealed a fine mixture of ferrite and bainite obviously as a result of strain-induced transformation, whereas the structure at the centreline remained essentially martensitic. Further, Nb-microalloying promoted the formation of ferrite and bainite even at higher FRTs, thus influencing the mechanical properties. The microstructures of the hot-rolled strips were further corroborated with the aid of CCT diagrams.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 619-626
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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