Characterization of the Factors Influencing Retained Austenite Stability in Q&amp;P Steels via In Situ EBSD

Adams, Derrik; Behling, M.; Miles, Michael; Homer, Eric R.; Sachdev, Anil K.; White, Emily V; Fullwood, David T.

doi:10.1007/s11661-023-06991-4

Cited by 6 publications

(1 citation statement)

References 32 publications

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“…Therefore, in cases where the yielding occurs by the stress-induced transformation of retained austenite, it is considered that the change in C γ can control the elastic limit of the martensitic steels containing retained austenite. However, not only C γ but also the size [34][35][36][37] , the shape [33][34][35][36] and the crystallographic orientation [34][35][36] of retained austenite possibly influence the , hence the further investigation is needed to clarify the influence of these factors on the S M σ yielding behavior of the low carbon martensitic steel containing retained austenite.…”

Section: Discussionmentioning

confidence: 99%

Yielding Behavior of Low Carbon Martensitic Steel Sheet Containing Retained Austenite

Tobata,

Minami,

Toji

et al. 2024

ISIJ Int.

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Quenching and Partitioning (Q&P) steel sheets, which utilize the transformation induced plasticity (TRIP) effect of retained austenite to improve the elongation of high strength steel sheets, are expected to become an important material for next-generation automotive structural parts. Although it has been reported that the yield strength (YS) of the Q&P steels consisting of tempered martensitic microstructure with retained austenite (hereafter "Q&P steels" in this study) is affected by retained austenite, the mechanism has not yet been discussed in detail. The purpose of this study is to clarify the effect of the carbon content in retained austenite on the yielding behavior of the Q&P steels. The chemical composition of the model steel used here was 0.18%C-1.5%Si-3.0%Mn (mass%). The steels were annealed at 1143K, then cooled to 473K, followed by holding at the temperatures between 523K and 673K for 600s. The increased carbon content in retained austenite increased the YS of the Q&P steels. It was found that the yielding of the Q&P steels was caused by the stress-induced transformation of retained austenite when the critical stress for the stress-induced transformation was lower than the elastic limit of tempered martensitic matrix. This result revealed that the increased carbon content in retained austenite was able to achieve the higher elastic limit of martensitic steels containing retained austenite.

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