Temat: steel grade - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Identification of Relevant Work Parameters of Ladle Furnace While Melting the High Ductility Steel and High-Carbon Steel
Autorzy:: Warzecha, M.
Garncarek, S.
Merder, T.
Skuza, Z.
Powiązania:: https://bibliotekanauki.pl/articles/356374.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ladle furnace
steel grade
high-carbon steels
high ductility steels
Opis:: In the present paper, secondary metallurgical treatment in ladle furnace during smelting the high carbon steel and steel with improved ductility for cold-deforming, under industrial conditions were analyzed. Common features of these steels are high requirements/strict standards imposed for their metallurgical purity; however they are especially exorbitant for improved ductility steels. In addition, it is widely used to specify alloying additives having significant weights- such as carbon and manganese - and explicitly restricted content of nitrogen requiring metal bath cover prior nitriding.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 275-278
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of Acoustic Emission Data Acquired During Tensile Deformation of Maraging Steel M250 Welded Specimens
Autorzy:: Wuriti, Gowri Shankar
Chattopadhyaya, Somnath
Krolczyk, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/176765.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: maraging steel M250 grade
AE
Acoustic Emission
stress strain
Opis:: Safety and reliability are primary concerns in launch vehicle performance due to the involved costs and risk. Pressure vessels are one of the significant subsystems of launch vehicles. In order to have minimal weight, high strength material viz. maraging steel M250 grade is used in realizing the pressure vessel casing hardware. Despite the best efforts in design methodology, quality evaluation in production and effective structural integrity assessment is still a farfetched goal. The evolution of such a system requires, first, identification of an appropriate technique and next its adoption to meet the challenges posed by advanced materials like maraging steels. In fact, a quick survey of the available Non-Destructive Evaluation (NDE) techniques suggests Acoustic Emission (AE) as an effective structural integrity assessment tool capable of identifying any impending failure or degradation at an earlier stage. Experience shows that the longitudinal welds in the pressure vessels are quite vulnerable to failure due to the fact that they experience the maximum stress (i.e. hoop stress). Loading welded tensile samples are quite synonymous to the hoop stress experienced by longitudinal welds. An attempt is made to compare the Acoustic Emission data acquired during tensile deformation of maraging steel welded specimens. A total of 16 welded specimen’s with known defects were studied for their tensile behaviour is in connection with Acoustic Emission data. The lowest failure load was 70.5 kN and the highest being 84.8 kN. AE activity graphs viz. cumulative AE activity, hit rate, energy rate, count rate, AE amplitude history, AE count history, AE energy history, amplitude-count correlation and hit amplitude distribution have been investigated and salient features with respect to the data have been critically studied and relevant correlations are arrived at.
Źródło:: Archives of Acoustics; 2020, 45, 2; 221-231
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Assessment of the Cold Plastic Workability of 20MnB4 Steel Wire Rod
Ocena zdolności do przeróbki plastycznej na zimno walcówki ze stali 20MnB4
Autorzy:: Laber, K.
Dyja, H.
Stradomski, G.
Kawałek, A.
Powiązania:: https://bibliotekanauki.pl/articles/352115.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: technological properties
plasticity
cold upsetting test
microscopic examination
20MnB4 steel grade
właściwości technologiczne
plastyczność
badanie mikroskopowe
stal 20MnB4
obróbka plastyczna na zimno
Opis:: The paper presents the results of cold upsetting testing of 16.5 mm-diameter 20MnB4 steel wire rod. The main purpose of the study was to evaluate the ability of wire rod produced in industrial conditions for further cold metal forming. Due to the fact that cracks occurred in the test material at different strain values, the authors made an attempt to answer the question whether there are any crack initiators in the material structure, or the observed cracks are due to the manufacturing process parameters. In order to determine the causes of cracks appearing during upsetting tests, micro- and macroscopic observation techniques were used. For the macroscopic examination, an Olympus SZ-31 microscope was used, while a Nikon Ma-200 microscope was employed for the microscopic examination. The microscopic examination was carried out both in a light and dark fields. To evaluate the effect of surface topography on the crack formation tendency, the results of macroscopic observation under a magnification from 6.7x to 45x were used.
W pracy przedstawiono wyniki badań próby spęczania na zimno walcówki o średnicy 16,5 mm ze stali 20MnB4. Głównym celem pracy była ocena zdolności do dalszej przeróbki plastycznej na zimno walcówki produkowanej w warunkach przemysłowych. W związku z tym, że w badanym materiale pojawiały się pęknięcia przy różnych wartościach odkształcenia, autorzy podjęli próbę odpowiedzi czy istnieją inicjatory pękania w strukturze materiału, czy też zaobserwowane pęknięcia są skutkiem procesu wytwarzania. W celu określenia przyczyn pojawiających się pęknięć w takcie próby spęczania zastosowano techniki obserwacji mikro i makroskopowej. Do oceny makroskopowej zastosowano mikroskop firmy Olympus SZ-31, natomiast do oceny mikro - mikroskop Nikon Ma-200. Badania mikroskopowe przeprowadzono w polu jasnym i ciemnym. Do oceny wpływu topografii powierzchni na skłonność do tworzenia pęknięć wykorzystano wyniki obserwacji makroskopowej z powiększeniami od 6,7x do 45x.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 4; 2791-2796
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Size of Non-Metallic Inclusions in High-Grade Medium Carbon Steel
Autorzy:: Lipiński, T.
Wach, A.
Powiązania:: https://bibliotekanauki.pl/articles/381358.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: quality management
environment protection
high-grade steel
steel
non-metallic inclusions
quantitative metallography
zarządzanie jakością
ochrona środowiska
stal wysokiej jakości
Opis:: Non-metallic inclusions found in steel can affect its performance characteristics. Their impact depends not only on their quality, but also, among others, on their size and distribution in the steel volume. The literature mainly describes the results of tests on hard steels, particularly bearing steels. The amount of non-metallic inclusions found in steel with a medium carbon content melted under industrial conditions is rarely presented in the literature. The tested steel was melted in an electric arc furnace and then desulfurized and argon-refined. Seven typical industrial melts were analyzed, in which ca. 75% secondary raw materials were used. The amount of non-metallic inclusions was determined by optical and extraction methods. The test results are presented using stereometric indices. Inclusions are characterized by measuring ranges. The chemical composition of steel and contents of inclusions in every melts are presented. The results are shown in graphical form. The presented analysis of the tests results on the amount and size of non-metallic inclusions can be used to assess the operational strength and durability of steel melted and refined in the desulfurization and argon refining processes.
Źródło:: Archives of Foundry Engineering; 2014, 14, 4; 55-60
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Welded joint cracking in martensitic stainless steel precipitation-sthregthened with copper
Pękanie złącz spawanych stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią
Autorzy:: Ziewiec, A.
Czech, J.
Tasak, E.
Powiązania:: https://bibliotekanauki.pl/articles/356169.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: 17-4PH grade
Weldability Testing
copper
liquid metal embrittlement
stainless steel
GTAW
fracture
Opis:: Problem of welded joint cracking in the HAZ of Cu strengthened 17-4PH grade precipitation hardening martensitic stainless steel is presented. Hypothesis concerning hydrogen embrittlement origin of the cracks is opposed. It was concluded that the cracks located in the high-temperature zone of the HAZ exhibit characteristics of hot cracks which originated as a result of steel embrittlement in the presence of Cu rich liquid phase. The mechanism of steel surface enrichment in Cu is proposed. Practical methods of cracks elimination are presented.
W artykule przedstawiono problem pękania w strefie wpływu ciepła stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią. Podważono literaturowe informacje wskazując, ze sa to pęknięcia zimne spowodowane kruchością wodorowa. Stwierdzono, ze pęknięcia zlokalizowane w wysokotemperaturowym obszarze SWC maja charakter pęknięć gorących i powstały w wyniku kruchości stali w obecności cieczy bogatej w miedz. Wyjaśniono mechanizm wzbogacania się powierzchni stali w miedz oraz podano technologiczny sposób eliminacji pęknięć.
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 4; 1055-1061
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Concrete grade change in the layers of three-layer steel fibre reinforced concrete beams
Autorzy:: Lam, T. Q. K.
Do, T. M. D.
Ngo, V. T.
Nguyen, T. T. N.
Pham, D. Q.
Powiązania:: https://bibliotekanauki.pl/articles/1818828.pdf
Data publikacji:: 2020
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: steel fibre concrete
stress-strain
crack
material nonlinear
multi-layer beams
concrete grade
beton
włókno stalowe
naprężenie-odkształcenie
pęknięcie
materiał nieliniowy
belki wielowarstwowe
klasa betonu
Opis:: Purpose: Determine the state of stress-strain, formation and development cracks, three-layer beam diagrams of load-compression stress, load-tension stress, load-vertical displacement relationships with a change in concrete grade. Design/methodology/approach: This paper presents the results of an ANSYS numerical simulation analysis involving stress-strain state and cracking of the steel fiber concrete layers of three-layer reinforced concrete beams with the upper and lower layers. With a cross-section of 150x300 mm, a total span of 2200 mm and an effective length of 2000 mm, the middle is a normal concrete layer. Under two-point loads, all the beam samples were tested. The research simulated three-layer concrete beams in different layers of beams with a change in concrete grade, and compared with and without the use of steel fibers in layers of concrete beams, including the nonlinearity of the material considered. Findings: A diagram of the formation and development of cracks in three-layer concrete beams has been constructed by the study results, determining the load at which the concrete beams begin to crack, the load at which the concrete beams are damaged. In the middle of three-layer steel fiber reinforced concrete beams, load-compression stress, loadtension stress, load-vertical displacement relationships are established. Study results show that these three-layer concrete beams appear to crack earlier than in other cases in cases 2 and 3, but the beam bearing capacity is damaged at 67 kN, the earliest in case 3. And case 6 at 116 kN is the latest. The effects of case 1 and case 3 are small compared with and without the use of steel fibers in cases, while the effects of case 5 and case 6 are very high. Research limitations/implications: The research focuses only on the change of concrete grade in the layers, but the input parameters affecting three-layer steel fiber concrete beams have not been researched, such as the number of tensile steel bars, tensile steel bar diameter, steel fiber content in concrete, thickness variation in three-layer concrete beam layers, etc. Practical implications: Provides a result of experimental study and ANSYS numerical simulation in multi-layer steel fiber concrete beams. Originality/value: The analysis of multi-layered steel fiber concrete beams using experimental and simulation methods shows that other parameters influencing the beams will continue to analysis the working stages of three-layer beams.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2020, 102, 1; 16--29
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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