Carbon content evolution in austenite during austenitization studied by in situ synchrotron X-ray diffraction of a hypoeutectoid steel

Denand, Benoît; Esin, Vladimir А.; Dehmas, Moukrane; Géandier, Guillaume; Denis, S.; Sourmail, Thomas; Aeby‐Gautier, Elisabeth

doi:10.1016/j.mtla.2020.100664

Cited by 14 publications

(7 citation statements)

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“…Consequently, the coefficient of thermal expansion (CTE) of the 06CV steel is calculated as 2.2641 × 10 −5 K −1 , which is consistent with previous studies [ 6 , 40 , 41 , 42 , 43 ] showing CTEs in the range of 2.0–2.5 (×10 −5 K −1 ) independent of the initial microstructure and chemical composition.…”

Section: Resultssupporting

confidence: 89%

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Kinetics of Carbon Enrichment in Austenite during Partitioning Stage Studied via In-Situ Synchrotron XRD

et al. 2023

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The present study reveals the microstructural evolution and corresponding mechanisms occurring during different stages of quenching and partitioning (Q&P) conducted on 0.6C-1.5Si steel using in-situ High Energy X-Ray Diffraction (HEXRD) and high-resolution dilatometry methods. The results support that the symmetry of ferrite is not cubic when first formed since it is fully supersaturated with carbon at the early stages of partitioning. Moreover, by increasing partitioning temperature, the dominant carbon source for austenite enrichment changes from ongoing bainitic ferrite transformation during the partitioning stage to initial martensite formed in the quenching stage. At low partitioning temperatures, a bimodal distribution of low- and high-carbon austenite, 0.6 and 1.9 wt.% carbon, is detected. At higher temperatures, a better distribution of carbon occurs, approaching full homogenization. An initial martensite content of around 11.5 wt.% after partitioning at 280 °C via bainitic ferrite transformation results in higher carbon enrichment of austenite and increased retained austenite amount by approximately 4% in comparison with partitioning at 500 °C. In comparison with austempering heat treatment with no prior martensite, the presence of initial martensite in the Q&P microstructure accelerates the subsequent low-temperature bainitic transformation.

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Section: Resultssupporting

confidence: 89%

“…In all of them, the weight of the carbon content is much greater than that of the substitutional elements. In this study, the Equation (3) proposed by Dyson and Holmes [ 41 ] was used:

…”

Section: Resultsmentioning

confidence: 99%

Kinetics of Carbon Enrichment in Austenite during Partitioning Stage Studied via In-Situ Synchrotron XRD

et al. 2023

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“…. Figura 10 -(a) MEV -Bainita granular e bainita em ripas -Aço ARBL ao Mo, Cr, V com 0,356% C em peso -Bainita isotérmica por 30 min em 450 -Extraído de Denand et al [68]; (b) MEV -Bainita em ripas e ferrita bainítica (BF) -Aço ARBL ao Nb-B-Ti com 0,060% C em peso -Resfriamento contínuo a 60 /s a partir de 1000 -Extraído de Sun et al [65] . .…”

Section: Lista De Figurasunclassified

“…O comportamento de formação da austenita em duas etapas condiz com o observado por outros autores [68,76,[100][101][102][103][104][105] para aços ARBL, geralmente compostos de uma microestrutura inicial mista de ferrita e perlita. No caso do aço JFE, como discutido anteriormente, o agregado eutetóide assemelha-se à perlita não lamelar.…”

Section: Análise Dilatométrica -Temperaturas Críticasunclassified

“…Quando comparamos com a literatura, as microestruturas de 5 e 10 /s assemelhamse bastante às dos aços ARBL com composições químicas similares. A morfologia da bainita encontrada nas Figuras 60 e 59 é muito similar à do trabalho de Denand et al [68], apresentada na Figura 10a. Analogamente, o aspecto dos agregados MA são próximos do encontrado por outros autores como Larzabal et al [70] como na mostrado na Figura 12b.…”

Section: Resfriamentos Intermediários -Entre 5 /S E 10 /Sunclassified

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Transformações de fase, microestruturas, e propriedades mecânicas de um aço resistente ao incêndio.

Gomes¹

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Agradeço à quem eu mais amo: minha mãe Maria Helena, ao meu pai Silvio (in memoriam), ao meu irmão André, e à minha família, e que sempre fizeram de tudo para priorizar minha educação, meu caráter, e minha pessoa.Agradeço ao meu orientador Professor Dr. Hélio Goldenstein pelo extremo carinho, apoio, confiança, cordialidade, simpatia, oportunidade e por ter me guiado nesse início dessa jornada da vida acadêmica.Ao Professor Dr. André Paulo Tschiptschin pelo cordial suporte, ajuda, e por oferecer a oportunidade de conhecer, crescer, discutir e trabalhar com os melhores.Ao meu coorientador, Dr. Julian Escobar David Atehortua pelas conversas, críticas, amizade, compreensão, aprendizado, e por acreditar em mim. Sem a sua ajuda este trabalho não seria o mesmo.Ao Mestre Felipe Moreno pela forte amizade e companheirismo durante o projeto. Ao Dr. Edwan Anderson Ariza Echeverri pelas frutíferas discussões e pela constante injeção de motivação, melhorando-me como pessoa. Ao Professor Dr. Julián Arnaldo Ávila Diaz por acompanhar, ajudar, apoiar e criticar quando necessário.Aos amigos e amigas da pós-graduação do PMT-USP e do Laboratório de Transformação de Fases (LTF) pelo ensino, ajuda, amizade, discussões e por propiciarem um ambiente incrível de se conviver. À República Masmorra pela amizade.Aos colegas do IPT, em especial a Dra. Ana Paola Villalva e ao Dr. Mario Boccalini Jr., por acompanharem, e estarem sempre presentes nas reuniões, tornando-as mais leves e produtivas.

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Formation Mechanism and Influence of Heating Temperature and Holding Time on Surface Decarburization of 40Cr Steel during Hot Forging Process

Yuan,

Wu,

et al. 2024

steel research int.

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During hot forging and heat treatment of 40Cr steel, a decarburized layer emerges on the surface, affecting fatigue life. However, the decarbonization of 40Cr steel has not been reported so far. The experiment mainly studies the effect of holding temperature and time on decarbonization. The 40Cr steel undergoes complete decarburization at 700 and 750 °C while experiencing a combination of complete and partial decarburization at 800 °C, transitioning solely to partial decarburization above 850 °C. The decarburized layer thickness measured at 750 and 800 °C is 140 and 200 μm respectively; the total decarburization layer thickness exhibits an exponential increase with the temperature. The thickness of the completely decarburized layer, influenced by varying factors across temperature ranges, initially rises and subsequently declines with the escalation of temperature, reaching its maximum at ≈750 °C. The maximum value of complete decarburization is 146 μm. Simultaneously, the total depth of decarburization is found to be proportional to the square root of time, adhering to Fick's second law. The fitting result is expressed as x = 165.47t1/2 at 750 °C. Notably, the existence of the decarburized layer results in a decrement in both the tensile strength and yield strength of the component, albeit accompanied by a marginal improvement in ductility.

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Carbon content evolution in austenite during austenitization studied by in situ synchrotron X-ray diffraction of a hypoeutectoid steel

Cited by 14 publications

References 45 publications

Kinetics of Carbon Enrichment in Austenite during Partitioning Stage Studied via In-Situ Synchrotron XRD

Kinetics of Carbon Enrichment in Austenite during Partitioning Stage Studied via In-Situ Synchrotron XRD

Transformações de fase, microestruturas, e propriedades mecânicas de um aço resistente ao incêndio.

Formation Mechanism and Influence of Heating Temperature and Holding Time on Surface Decarburization of 40Cr Steel during Hot Forging Process

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