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Effect of Ausforming on the Stability of Retained Austenite in a C-Mn-Si Bainitic Steel
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논문 기본 정보

Type
Academic journal
Author
Guang Xu (Wuhan University of Science and Technology)
Journal
The Korean Institute Of Metals And Meterials Metals and Materials International Metals and Materials International Vol.21 No.5 KCI Accredited Journals
Published
2015.1
Pages
929 - 935 (7page)

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Effect of Ausforming on the Stability of Retained Austenite in a C-Mn-Si Bainitic Steel
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The effect of ausforming on the stability of retained austenite in a C-Mn-Si bainitic steel was investigated through metallography, X-ray diffraction and dilatometry. The geometrical relationships of the amount of bainite transformation and the volume fractions of retained austenite with deformation strains were studied. The results show that the degree of promotion of small strains on bainite transformation is nonlinear because of the dual effects of accelerated nucleation and retarded growth caused by ausforming. The transformed bainite fraction first increased and then decreased with increased small strains. It indicates that there is a maximum degree of the promotional function corresponding to a certain small strain at low temperature. Although small strains promote bainite transformation, a larger quantity of retained austenite exists at room temperature due to the suppressed martensite transformation during the cooling process after bainite transformation. The carbon content in retained austenite increases with the amount of baintie transformation, which contributes to the stability of austenite. Compared with the stabilizing effect due to carbon enrichment, mechanical stabilization caused by ausforming has a decisive effect on determining the volume fraction of retained austenite after isothermal bainite transformation.

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J. Speer / 2003 / Acta Mater 51:2611 google schola J. Shi / 2010 / Scripta Mater 63:815 google schola H. K. D. H. Bhadeshia / 2005 / Mater. Sci. Forum 500-501:63 google schola Y. F. Shen / 2013 / Mater. Sci. Eng. A 583:1 google schola J. Wang / 2001 / Metall. Mater. Trans. A 32:1527 google schola

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