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首页> 外文期刊>Metals and Materials International >Effect of Ausforming on the Stability of Retained Austenite in a C-Mn-Si Bainitic Steel
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Effect of Ausforming on the Stability of Retained Austenite in a C-Mn-Si Bainitic Steel

机译：奥氏体化对C-Mn-Si贝氏体钢中残余奥氏体稳定性的影响

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摘要

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.
机译：通过金相，X射线衍射和膨胀法研究了奥氏体化对C-Mn-Si贝氏体钢中残余奥氏体稳定性的影响。研究了贝氏体相变量与残余奥氏体体积分数与形变应变的几何关系。结果表明，小应变对贝氏体转变的促进程度是非线性的，这是由于奥氏体形成加速成核和延缓生长的双重作用。随着小应变的增加，转变的贝氏体分数首先增加，然后减少。这表明在低温下存在最大程度的促进功能，对应于一定的小应变。尽管小的应变促进贝氏体相变，但由于在贝氏体相变后的冷却过程中马氏体相变受到抑制，因此在室温下存在大量残留奥氏体。残余奥氏体中的碳含量随贝氏体转变量的增加而增加，这有助于奥氏体的稳定性。与由于碳富集而产生的稳定作用相比，由奥氏体形成的机械稳定作用对确定等温贝氏体转变后残留奥氏体的体积分数具有决定性作用。

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