期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141852
关键词
Intercritical rolling; Cold rolling; Intercritical annealing; Medium Mn steel; Retained austenite
类别
资金
- In-house Project Support Group (i-PSG)
The effect of intercritical annealing on medium-Mn steel processed through different routes showed distinct variations in grain structure, mechanical properties, and deformation behavior after annealing. Higher fraction of retained austenite was found in CR-annealed samples compared to IR-annealed samples due to extensive recrystallization. IR-annealed samples exhibited higher yield strength and ultimate tensile strength, while CR sample annealed at 800 degrees C showed a high elongation of 57% with a strength-ductility combination of 47.7 GPa%.
In the present work, the effect of intercritical annealing on Fe-8Mn-4Al-3.5Ni-0.8Si-0.25C (wt.%) medium-Mn steel, processed through two different processing routes viz. intercritical rolling (IR) and cold rolling (CR), has been studied. The microstructure, mechanical properties, austenite stability and deformation behavior of the steel, after intercritical annealing (IA) at different temperatures (760, 800 and 840 degrees C), has been investigated. It has been observed that different rolling regimes (intercritical rolling and cold rolling) give rise to distinct variation in the grain structure owing to different recrystallization behavior during intercritical annealing. The IR-annealed samples showed a mixture of lath and equiaxed grains while the CR-annealed samples showed mostly equiaxed grain morphology. Due to extensive recrystallization in CR-annealed samples, a higher fraction of retained austenite was formed, as compared to IR-annealed samples. The yield strength (YS) and ultimate tensile strength (UTS) was found to be higher for IR-annealed samples, as compared to CR-annealed samples, at all annealing temperatures. However, a high elongation (EL) of 57 % with (UTS x %El) product of 47.7 GPa% was obtained in CR sample, annealed at 800 degrees C. The mechanical stability of retained austenite was found to influence the work hardening behavior of the annealed samples. The CR-annealed samples exhibited strain-induced transformation to alpha '-martensite, as compared to epsilon-martensite transformation in IR-annealed samples. A sustained three-stage strain hardening behavior during deformation, comprising combined TWIP and discontinuous TRIP effect, led to excellent strength-ductility combination in CR sample annealed at 800 degrees C.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据