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首页> 外文会议>Nanomaterials by sever plastic deformation IV >Strain Rate Sensitivity of 31Mn-3AI-3Si TWIP steel with Partially Recrystallized Fine Grained Structure
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Strain Rate Sensitivity of 31Mn-3AI-3Si TWIP steel with Partially Recrystallized Fine Grained Structure

机译：部分重结晶细晶组织的31Mn-3Al-3Si TWIP钢的应变率敏感性

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摘要

Strain rate sensitivity of the strength of TWIP (Twinning Induced Plasticity) steel with the mixture of recrystallized fine grains and rolling-deformation microstructures was studied. The 31mass%Mn-3%Al-3%Si TWIP steel sheet was severely cold-rolled to a reduction of 92% and subsequently annealed at various temperatures ranging from 600℃ to 700℃ in order to obtain the partial recrystallized microstructure with various fraction of recrystallized microstructure. The 600℃ annealed specimen keeps similar morphologies as observed in the as-rolled structure consisting of both the fine lamellar dislocation cell structure and the twin/matrix lamellar structure; whereas, in the specimen annealed at 625℃ or 675℃ , the partially recrystallized fine grains (d~1μm) with a few dislocations evolve. The volume fraction of recrystallized fine grains increases with increasing of the annealing temperature while the mean diameter of the recrystallized grains is not changed largely. The tensile deformation behaviors were measured at various strain rates ranging from 10~(-3)sec~(-1) to 10~2sec~(-1). The strength and elongation become smaller and larger, respectively, with increasing the fraction of the recrystallized microstructure. The activation volume of dislocations becomes larger with increasing the fraction of recrystallized microstructure.
机译：研究了重结晶细晶粒与轧制变形组织混合的TWIP（孪生感应塑性）钢强度的应变率敏感性。将31质量％Mn-3％Al-3％Si TWIP钢板严格冷轧至压下率达到92％，然后在600℃至700℃的不同温度下进行退火，以获得具有不同分数的部分再结晶组织。重结晶的微观结构。 600℃退火的试样保持与由细层状位错细胞结构和孪晶/基体层状结构组成的轧制结构中观察到的相似的形态。而在625℃或675℃退火的试样中，出现了部分位错的部分再结晶细晶粒（d〜1μm）。再结晶细晶粒的体积分数随着退火温度的升高而增加，而再结晶晶粒的平均直径没有很大变化。在10〜（-3）sec〜（-1）至10〜2sec〜（-1）的不同应变速率下测量了拉伸变形行为。强度和伸长率分别随着再结晶组织的分数的增加而变小和变大。位错的激活体积随着重结晶微结构分数的增加而变大。

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