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    Wyświetlanie 1-12 z 12
    Tytuł:
    Dilatometric Study of High Strength Steels Hardenability
    Autorzy:
    Di Schino, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351965.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high strength steel
    quenching
    hardenability
    microstructure
    Opis:
    The effect of low-alloy additions on low-C steels hardenability is reported. Various as-quenched materials with microstructures consisting of low-C (granular) bainitic (B), mixed bainitic (B)/martensitic (M) and fully martensitic microstructures were produced. Results show that for a given cooling rate, an increase of austenite grain size (AGS) and of Mo and Cr contents decreases the transformation temperatures and promotes martensite formation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 457-460
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of Structural Steel Containing 3÷5 wt% Al with Microlaminated Microstructure
    Autorzy:
    Garbarz, B.
    Adamczyk, M.
    Niżnik-Harańczyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/351953.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high strength steel
    alloying with aluminium
    microlaminated microstructure
    Opis:
    The aim of this work was to develop basic parameters of hot rolling and controlled cooling technology allowing to obtain the microlaminated (lamellar) microstructure in a lean-alloy structural steel containing 3÷5 wt % Al. Thermo-mechanical rolling tests of two experimental steels were carried out in a semi-industrial line comprising a one – stand reversing rolling mill. The final microstructure of the specimens subjected to rolling in the γ + α stability region characterised with the microlaminated morphology composed of lamellae of ferrite with thickness down to 1 μm or less and lamellae or grains of phases developed during transformation of the austenite. Determined parameters of the thermo-mechanical processing allowed to achieve very attractive mechanical properties of the experimental steels: tensile strength over 1.0 GPa and ductility level (total elongation) better than 15%.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2309-2315
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of microstructure of resistance spot-welded joints made of HSLA340 and DP600 steels
    Badanie mikrostruktury złączy zgrzewanych punktowo ze stali HSLA340 I DP600
    Autorzy:
    Ignasiak, A.
    Korzeniowski, M.
    Ambroziak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/356179.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    resistance spot welding
    high-strength steel
    metallographic examination
    Opis:
    The paper presents results of metallographic investigations of spot welds made of high-strength steel HSLA340 and dual-phase DP600 steel. Low-carbon martensite microstructure was found in the weld nugget of HSLA steel. The DP600 steel shows martensite and bainite microstructure. For both steels, no carbides of microadditives were found because they dissolved in liquid nugget and could not precipitate again because of rapid heat abstraction. Moreover, no transcrystallisation was found in both steels, which proves good mixing of the materials within the weld.
    W artykule opisano wyniki badań metalograficznych zgrzein punktowych wykonanych ze stali o podwyższonej wytrzymałości HSLA340 i dwufazowej stali DP600. Badania wykazały, ze jądro zgrzeiny dla stali HSLA ma mikrostrukture martenzytu niskowęglowego, a dla stali DP600 martenzytu i bainitu. Dla obu gatunków stali w zgrzeinie nie obserwowano węglików mikrododatków stopowych, gdyż w czasie tworzenia ciekłego jądra zostały one rozpuszczone, a w wyniku szybkiego odprowadzania ciepła do elektrod nie zdołały sie ponownie wydzielić. Ponadto dla obu gatunków stali zaobserwowano brak transkrystalizacji, co świadczy o dobrym wymieszaniu sie materiałów w obrebie zgrzeiny.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 4; 1081-1086
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Welding Thermal Cycles on Microstructure and Mechanical Properties of Simulated Heat Affected Zone for a Weldox 1300 Ultra-High Strength Alloy Steel
    Autorzy:
    Węglowski, M. St.
    Zeman, M.
    Grocholewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355256.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultra-high strength steel
    weldability
    Weldox 1300 steel
    physical simulation
    Opis:
    In the present study, the investigation of weldability of ultra-high strength steel has been presented. The thermal simulated samples were used to investigate the effect of welding cooling time t8/5 on microstructure and mechanical properties of heat affected zone (HAZ) for a Weldox 1300 ultra-high strength steel. In the frame of these investigation the microstructure was studied by light and transmission electron microscopies. Mechanical properties of parent material were analysed by tensile, impact and hardness tests. In details the influence of cooling time in the range of 2,5 ÷ 300 sec. on hardness, impact toughness and microstructure of simulated HAZ was studied by using welding thermal simulation test. The microstructure of ultra-high strength steel is mainly composed of tempered martensite. The results show that the impact toughness and hardness decrease with increase of t8/5 under condition of a single thermal cycle in simulated HAZ. The increase of cooling time to 300 s causes that the microstructure consists of ferrite and bainite mixture. Lower hardness, for t8/5 ≥ 60 s indicated that low risk of cold cracking in HAZ for longer cooling time, exists.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 127-132
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the DRECE Process of Severe Plastic Deformation on the Mechanical Properties of the Ultra-Low Carbon Interstitial Free Steel
    Autorzy:
    Kowalczyk, K.
    Jabłońska, M.
    Rusz, S.
    Bednarczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/352805.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sheet metal
    high strength steel
    interstitial free steel
    SPD process
    Opis:
    This research paper shows the influence of a repeated SPD (Severe Plastic Deformation) plastic forming with the DRECE technique (Dual Rolls Equal Channel Extrusion) on hardening of low carbon IF steel. The influence of number of passes through the device on change of mechanical properties, such as tensile strength TS and yield stress YS, of tested steel was tested. The developed method is based on equal channel extrusion with dual rolls and uses a repeated plastic forming to refinement of structure and improve mechanical properties of metal bands [1-2]. For the tested steel the increase of strength properties after the DRECE process was confirmed after the first pass in relation to the initial material. The biggest strain hardening is observed after the fourth pass.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 2095-2100
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties and Structure of X30MnAlSi26-4-3 High Strength Steel Subjected to Dynamic Compression Processes
    Autorzy:
    Śmiglewicz, A.
    Jabłońska, M.
    Moćko, W.
    Kowalczyk, K.
    Hadasik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355215.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high strength steel
    dynamic compression
    split Hopkinson bar
    share bands
    Opis:
    The paper presents the results of investigation on X30MnAlSi26-4-3 austenitic steel subjected to dynamic compression using the split Hopkinson pressure bar. The strain rate was 3700 s-1. The compression test was also carried out without the use of breaking rings and then true strain was about 0.3. The split Hopkinson pressure bar test take only few milliseconds to complete during which time it is impossible to transfer the excess heat out of the specimen, therefore the test must be carried out in adiabatic conditions and so the increase of the temperature caused by the work of plastic deformation had to be calculated. The stepping load method was used in order to evaluate the effect of adiabatic heating on the properties of steel which allowed to maintain the isothermal deformation conditions. The paper presents the comparison of results obtained during deformation under adiabatic and isothermal conditions in correlation to structure changes occurring in course of dynamic compression.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2255-2260
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlations of Mechanical Properties and Microstructure at Specific Zones of Welded Joint of High-Strength Low-Alloy Steels
    Autorzy:
    Ivanović, L.
    Marjanović, V.
    Ilić, A.
    Stojanović, B.
    Lazić, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/354032.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-strength low-alloy steel
    welded joint
    mechanical properties
    microstructure
    Opis:
    This paper presents experimental testing of the mechanical characteristics and properties of samples made of high-strength low-alloy steel with two different multi pass V grove butt welded joint. Two sample groups are tested: the root pass is made by manual metal arc welding process for the former and metal inert gas welding process for the latter. Other passes of those multi passes welded joints are made by metal active gas welding process. Further, the research included analyses of the experimentally obtained mechanical properties and load response of the samples in correlations to microhardness distribution and microstructural state at specific zones of the welded joints. Since both the chemical composition and microstructural state of high-strength low-alloy steel originate from special production processes their nature must be fully understood. Accordingly, the nature of the steels should directly impact not only the selection and definition of welding but the design process of mechanical constructions, too. From the practical aspect, mechanical characteristics and properties as well as load response of welded joints are crucial. But, sensitivity of those steels to inadequate welding technology and improper parameters or filler metal is high. On the other side, design codes and recommendations are not yet fully developed and precise. Results obtained in this research implicate that even small changes of welding technology causes the change of characteristics itself. Consequently, the steels development must be accompanied with the improvement of the welding processes and design modifications.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 285-292
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Characterization and Mechanical Properties of Electron Beam Welded Joint of High Strength Steel Grade S690QL
    Autorzy:
    Błacha, S.
    Węglowski, M. S.
    Dymek, S.
    Kopuściański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354148.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electron beam welding
    high strength quenched and tempered steel
    microstructure
    Opis:
    In the paper the results of metallographic examination and mechanical properties of electron beam welded joint of quenched and tempered steel grade S690QL are presented. Metallographic examination revealed that the concentrated electron beam significantly affect the changes of microstructure in the steel. Parent material as a delivered condition (quenched and tempered) had a bainitic-martensitic microstructure at hardness about 290 HV0.5. After welding, the microstructure of heat affected zone is composed mainly of martensite (in the vicinity of the fusion line) of hardness 420 HV0.5. It should be noted, however, that the microstructure of steel in the heat affected zone varies with the distance from the fusion line. The observed microstructural changes were in accordance with the CCT-S transformation diagram for the examined steel.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1193-1200
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural and Mechanical Characterization of Electron Beam Welded Joints of High Strength S960QL and Weldox 1300 Steel Grades
    Autorzy:
    Błacha, S.
    Węglowski, M. S.
    Dymek, S.
    Kopyściański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356483.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electron beam welding
    high strength quenched and tempered steel
    weld microstructure
    Opis:
    The paper shows the results of metallographic examination and mechanical properties of electron beam welded joints of quenched and tempered S960QL and Weldox 1300 steel grades. The aim of this study was to examine the feasibility of producing good quality electron beam welded joints without filler material. Metallographic examination revealed that the concentrated electron beam significantly affects the changes of microstructure in the weld and the adjacent heat affected zone (HAZ) in both steel grades. The microstructure of the welded joints is not homogeneous. The four zones, depending on the distance from the weld face, can be distinguished. Basically, the microstructure of the weld consists of a mixture of martensite and bainite. However, the microstructure of HAZ depends on the distance from the fusion line. It is composed of martensite near the fusion line and a mixture of bainite and ferrite in the vicinity of the base material. Significant differences in mechanical properties of the welded joints were observed. For a butt welded joint of the S960QL steel grade the strength is at the level of the strength of the base material (Rm = 1074 MPa). During the bending test the required angle of 180° was achieved. The impact strength at –40°C was 71,7 J/cm2 . In the case of the Weldox 1300 steel grade butt welded joints exhibit high mechanical properties (Rm = 1470 MPa), however, the plastic properties are on the lower level than for the base material.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 627-634
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In-Situ Observation of Acicular Ferrite Transformation in High-Strength Low-Alloy Steel Using Confocal Laser Scanning Microscopy
    Autorzy:
    Lee, Sang-In
    Shin, Seung-Hyeok
    Park, Hyeonwoo
    Kim, Hansoo
    Lee, Joonho
    Hwang, Byoungchul
    Powiązania:
    https://bibliotekanauki.pl/articles/2174577.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acicular ferrite
    high-strength low-alloy steel
    confocal laser scanning microscopy
    CLSM
    phase transformation
    in-situ observation
    Opis:
    In-situ observation of the transformation behavior of acicular ferrite in high-strength low-alloy steel using confocal laser scanning microscopy was discussed in terms of nucleation and growth. It is found that acicular ferrite nucleated at dislocations and slip bands in deformed austenite grains introduced by hot deformation in the non-recrystallization austenite region, and then proceeded to grow into an austenite grain boundary. According to an ex-situ EBSD analysis, acicular ferrite had an irregular shape morphology, finer grains with sub-grain boundaries, and higher strain values than those of polygonal ferrite. The fraction of acicular ferrite was affected by the deformation condition and increased with increasing the amount of hot deformation in the non-recrystallization austenite region.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1497--1501
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some aspects of continuous casting of low carbon microalloyed steels with niobium and titanium
    Wybrane aspekty ciągłego odlewania niskowęglowych stali z mikrododatkami niobu i tytanu
    Autorzy:
    Derda, W.
    Wiedermann, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/354585.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ciągłe odlewanie stali
    stal niskostopowa
    pęknięcia narożne
    fazy niemetaliczne
    parametry odlewania
    continuous casting of steel
    high strength low alloy steel
    corner cracks
    non-metallic phases
    casting parameters
    Opis:
    An analysis of the causes of transverse corner and surface crack formation during continuous casting of low carbon niobium and titanium-containing steel into square billets is presented in this paper. Using X - ray analysis method, the chemical composition of non- metallic phases inside corner cracks was determined. The temperature ranges of the occurrence of nitrides and carbonitrides of Nb, Ti and Al were established using FactSage 6.2., a commercial computer program. The need for the precise selection of cooling conditions during casting of billets both in the mould and in spray cooling regions was pointed out with the aim of obtaining the optimum surface, and particularly corner temperature of the billet before its entrance to the straightening stand.
    W referacie przedstawiono na podstawie badań w warunkach przemysłowych, analizę przyczyn powstawania pęknięć na powierzchni i na narożach wlewków ciągłych o przekroju kwadratowym, odlewanych ze stali niskowęglowych z zawartością niobu i tytanu. Przy użyciu metody mikroanalizy rentgenowskiej dokonano oceny składu chemicznego faz niemetalicznych występujących wewnątrz pęknięć. Z wykorzystaniem programu komputerowego FactSage 6.2 wyznaczono zakresy temperatury występowania azotków i węglikoazotków Nb, Ti, Al. Wskazano na konieczność precyzyjnego doboru warunków chłodzenia odlewanych stali w krystalizatorze oraz w strefie chłodzenia natryskowego celem uzyskania optymalnej temperatury wlewka ciągłego w szczególności na narożach przed operacją jego prostowania w klatce walców ciągnąco - prostujących.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 1; 303-310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests
    Wpływ prędkości odkształcenia na właściwości i strukturę stali wysokomanganowej po testach deformacji dynamicznej
    Autorzy:
    Jabłońska, M. B.
    Śmiglewicz, A.
    Niewielski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/958229.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-manganese steel
    dynamic deformation test
    strain rate
    impact strength
    mechanical twinning
    structure
    stal wysokomanganowa
    testy deformacji dynamicznej
    prędkość odkształcenia
    siła uderzenia
    bliźniakowanie mechaniczne
    struktura
    Opis:
    The paper presents results of dynamic tensile investigations of high-manganese Fe – 20 wt.% Mn – 3 wt.% Al – 3 wt.% Si – 0.2 wt.% steel. The research was carried out on a flywheel machine, which enables to perform dynamic tensile tests and impact bending with a linear velocity of the enforcing element in the range of 5÷40 m/s. It was found that the studied steel was characterized by very good mechanical properties. Strength of the tested materials was determined in the static tensile test and dynamic deformation test, while its hardness was measured with the Vickers hardness test method. The surface of fractures that were created in the areas where the sample was torn were analyzed. These fractures indicate the presence of transcrystalline ductile fractures. Fractographic tests were performed with the use of a scanning electron microscope. The structure was analyzed by light optical microscopy. Substructure studies revealed occurrence of mechanical twinning induced by high strain rates. A detailed analysis of the structure was performed with the use of a transmission scanning electron microscope STEM.
    W pracy przedstawiono wyniki wstępnych badań dynamicznego rozciągania wysokomanganowej stali gatunku X20MnAlSi16-3-3. Badania przeprowadzono na młocie rotacyjnym, który posiada możliwość realizacji prób dynamicznego rozciągania i udarowego zginania w zakresie prędkości liniowej elementu wymuszającego od 5÷40 m/s. Badana stal charakteryzuje się bardzo dobrymi właściwościami mechanicznymi. Wyniki badań uzyskano na podstawie statycznej próby rozciągania, próby dynamicznego rozciągania na młocie rotacyjnym oraz pomiaru twardości metodą Vickersa. Przeanalizowano powierzchnie przełomów powstałych w miejscu zerwania podczas prób rozciągania, które wskazują na obecność przełomów transkrystalicznych ciągliwych. Badania strukturalne wykonano z wykorzystaniem techniki mikroskopii świetlnej, skaningowej mikroskopii elektronowej i skaningowej transmisyjnej mikroskopii elektronowej. Przeprowadzone badania substruktury ujawniły obecność mechanizmu bliźniakowania mechanicznego, indukowanego w warunkach dużych prędkości odkształcenia.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 577-580
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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