Microstructure and texture evolution under strain-path changes in low-carbon interstitial-free steel
Microstructure and texture evolution under strain-path changes in low-carbon interstitial-free steel
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DOI：
10.1007/s11661-001-0042-9
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发表时间：
2001-10-01
影响因子：
2.8
通讯作者：
Teodosiu, C
中科院分区：
文献类型：
--
作者：
Nesterova, EV;Bacroix, B;Teodosiu, C
本文研究了一种低碳ti淬灭无间隙钢（IF）在单轴拉伸/单轴剪切和单轴拉伸/单轴剪切应变路径随晶粒取向变化后的透射电镜显微结构。讨论了微观组织与织构演变的相互关系及其对力学行为的共同影响。在鲍辛格简单剪切序列中，预应变组织的部分消失导致了反向加载早期加工硬化的停滞。在逆向变形过程中，取向不稳定晶粒的破碎仍会减慢加工硬化速率。在具有发育良好的应变前位错边界和属于特定取向群的晶粒内，出现了在正交应变路径变化后的微带内塑性流动的强烈局部化。
The transmission electron microscopy (TEM) microstructure of a low-carbon Ti-killed interstitial free (IF) steel has been examined after simple-shear/simple-shear and uniaxial-tension/simple-shear strain path changes in connection with the crystallographic orientation of the grains. The results are discussed in the context of the inter-relation between the microstructure and texture evolutions and their joint influence on the mechanical behavior. A partial disappearance of prestrain microstructures is shown to cause the stagnation of work hardening at earlier stages of reversed loading during Bauschinger simple-shear sequences. Under progressing reversed deformation, a fragmentation of the grains of unstable orientations still slows down the work-hardening rate. A strong localization of plastic flow within microbands following an orthogonal strain-path change is shown to occur within the grains containing well-developed prestrain dislocation boundaries and belonging to certain orientation groups.