Grain size and shape dependent crystal plasticity finite element model and its application to electron beam welded SS316L
Grain size and shape dependent crystal plasticity finite element model and its application to electron beam welded SS316L
复制标题
晶粒尺寸和形状相关的晶体塑性有限元模型及其在电子束焊接 SS316L 中的应用
DOI：
10.1016/j.jmps.2023.105331
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发表时间：
2023
影响因子：
5.3
通讯作者：
Demir E
中科院分区：
文献类型：
--
作者：
Demir E
电子束焊接是一种自焊工艺，其导致微观结构不均匀性;晶体结构，相对于周围母材的细长和较大的晶粒尺寸。本研究的目的是预测焊缝熔合区的机械响应的变化作为晶粒形态和纹理的函数，通过使用母材性能，以避免广泛和昂贵的实验活动。出于这个原因，晶体塑性求解器，“布里斯托大学cryStal plasTicity sOLver”（BRISTOL），实现在一个有限元框架与新的本构关系，考虑到晶粒的尺寸和形状的长度尺度依赖。据发现，晶体织构支配的取向特定的弹性刚度和屈服应力的宏观响应的焊件在考虑的晶粒尺寸尺度上具有最显着的影响。至关重要的是，长度尺度相关的模型可以准确预测的屈服强度的焊件在一系列的微观结构，也突出了其他因素的存在，如在焊接过程中的应变硬化和残余应力。
Electron beam welding is an autogenous welding process that leads to microstructural heterogeneities; crystallographic texture, elongated and larger grain size relative to the surrounding parent material. The goal of this study is to predict the changes in mechanical response of the weld fusion zone as a function of grain morphology and texture by using the parent material properties to avoid extensive and costly experimental campaigns. For this reason, a crystal plasticity solver, “University ofBRIstol cryStal plasTicity sOLver” (BRISTOL), is implemented in a finite element framework with new constitutive laws to account for the length-scale dependence considering the size and shape of the grains. It is found that the crystallographic texture governs the orientation specific elastic stiffness and yield stress having the most dominant effect on the macroscopic response of the weldment at the grain size scales considered. Crucially the length-scale dependent model allows accurate prediction of the yield strength of the weldment over a range of microstructures, also highlighting the presence of other factors such as prior strain hardening during the welding process and residual stresses.