Coupled effects of texture, hardening and non-proportionality of strain on ductility in ferritic steel
Coupled effects of texture, hardening and non-proportionality of strain on ductility in ferritic steel
复制标题
织构、硬化和非比例应变对铁素体钢延展性的耦合影响
DOI：
10.1016/j.commatsci.2013.03.002
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发表时间：
2013
影响因子：
3.3
通讯作者：
Erinosho T
中科院分区：
文献类型：
--
作者：
Erinosho T
使用晶体塑性有限元框架研究了多晶 BCC 钢的应变、初始织构和硬化的非比例性。研究了两种极端形式的硬化；即各向同性潜在硬化和各向异性自硬化。计算了所有独立滑移系统上的位错密度演化，以研究位错分布的建立及其对非比例性、硬化和初始织构的依赖性。此外，两种硬化规则下的极限应变已沿着非比例应变路径预测到相同的最终单轴和双轴状态。此外，还引入了非比例性测量，可以区分初始纹理的效果。讨论了两种织构（初始随机织构和织构多晶）的结果，并研究织构、硬化和非比例性对成形极限的耦合影响。对经受非比例应变的初始随机织构的位错分布进行检查表明，结构差异在单轴应变下比双轴应变下更为明显。应变路径中的非比例性对应变局部化有显着影响，根据非比例性水平导致延展性增加或减少。这种行为的基础是位错分布发展的路径依赖性。因此，有可能选择预成型纹理和非比例路径，以最大化成型极限应变。
Non-proportionality of straining, initial texture and hardening have been investigated in polycrystal BCC steel using a crystal plasticity finite element framework. Two extreme forms of hardening are investigated; namely, isotropic latent hardening and anisotropic self-hardening. Dislocation density evolutions on all independent slip systems have been calculated in order to investigate the establishment of dislocation distributions and their dependence on non-proportionality, hardening and initial texture. Also, the limit strains under both hardening rules have been predicted along the non-proportional strain paths to identical final uniaxial and biaxial states. Further, a measure of non-proportionality has been introduced which enables differentiation of the effects of initial texture. The results for two textures (initially random and textured polycrystal) are discussed and the coupled effects of texture, hardening and non-proportionality on forming limit investigated.Examination of dislocation distributions for an initially random texture subjected to non-proportional straining shows that differences in structures develop which are more pronounced under uniaxial as opposed to biaxial straining. Non-proportionality in strain path is shown to have a significant effect on strains to localization, leading both to increases and decreases in ductility depending upon level of non-proportionality. The basis for this behavior is the path dependence of the development of dislocation distributions. There is the potential, therefore, for the selection of pre-forming texture and non-proportionality path in order to maximize forming limit strains.
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DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
W. Volk;A. Wahlen;P. Hora;L. Kessler;W. Hotz
通讯作者：
W. Hotz
DOI：
10.1007/s11661-010-0284-5
发表时间：
2010-10-01
影响因子：
2.8
作者：
Lewis, Alexis C.;Qidwai, Siddiq M.;Geltmacher, Andrew B.
通讯作者：
Geltmacher, Andrew B.
将与珠光体和贝氏体微观结构相关的长度尺度纳入粘塑性自洽模型
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
D. Canadinc;H. Sehitoglu;H. Maier;P. Kurath
通讯作者：
P. Kurath
多轴循环硬化行为的应变路径依赖性
DOI：
--
发表时间：
1998
期刊：
影响因子：
--
作者：
J. Betten;M. Waniewski
通讯作者：
M. Waniewski