Solid-state phase transformation and strain hardening on the residual stresses in S355 steel weldments
Solid-state phase transformation and strain hardening on the residual stresses in S355 steel weldments
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DOI：
10.1016/j.jmatprotec.2018.10.018
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发表时间：
2019-03-01
影响因子：
6.3
通讯作者：
Dilger, Klaus
中科院分区：
文献类型：
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作者：
Sun, Jiamin;Hensel, Jonas;Dilger, Klaus
为了研究不同材料模型下焊接残余应力的变化规律，进行了一系列的数值模拟。进行了一项实验，以测量热循环和WRS在铁素体钢5355焊接件进行验证。由于固态相变（SSPT）影响位错密度，从而也应变硬化，应变硬化恢复所造成的SSPT应考虑WRS的准确预测，特别是在单道焊缝。混合硬化模型提供了更准确的WRS预测。建议在数值模拟中考虑SSPT而不考虑应变硬化，以简化计算，但仍具有可接受的精度。
A series of numerical simulations were performed to examine the variability in welding residual stresses (WRS) for different material models. An experiment was carried out to measure thermal cycles and WRS in the ferritic steel 5355 weldment for validation. Since solid-state phase transformation (SSPT) affects the dislocation density and thereby also the strain hardening, strain hardening recovery caused by SSPT should be considered for the accurate prediction of WRS, especially in single-pass welds. The mixed hardening model provides the more accurate prediction of WRS. It is recommended to consider SSPT regardless of strain hardening in numerical simulation of WRS for simplification but still with acceptable accuracy.