Influence of temperature- and phase-dependent yield strength on residual stresses in ultra-high strength steel S960 weldments
Influence of temperature- and phase-dependent yield strength on residual stresses in ultra-high strength steel S960 weldments
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DOI：
10.1016/j.jmrt.2021.09.050
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Jiamin Sun;T. Nitschke–Pagel;K. Dilger
中科院分区：
文献类型：
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作者：
Jiamin Sun;T. Nitschke–Pagel;K. Dilger
与温度和相相关的屈服强度在结构钢焊件残余应力的精确预测中起着决定性作用。由于通过实验方法直接测量给定钢的屈服强度非常昂贵且耗时，因此通常使用科学文献和材料数据库中相同钢种的可用屈服强度或使用基于给定钢的标准/规范中的经验公式的评估数据来进行数值模拟。然而，同一钢种的屈服强度通常不同，主要是由于化学成分和晶粒尺寸的差异。此外，根据给定钢的预测函数获得的高温屈服强度存在相当大的差异。因此，有必要阐明不同方法获得的温度和相位相关屈服强度的变化对数值模拟中预测的焊接残余应力的影响。在本研究中，进行了数值敏感性分析，以阐明屈服强度对超高强度钢 S960 焊件的预测残余应力的影响。此外，还进行了拉伸试验和焊接实验进行比较和验证。基于当前的工作，阐明了温度和相位相关的屈服强度对计算的焊接残余应力的影响。此外，针对最近开发的超高强度钢S960，评估了主要基于低碳钢和传统高强度钢的拉伸试验结果来评估屈服强度的所提出函数的可靠性。最后，提供了有关如何在数值焊接模拟中经济地确定 S960 钢可靠的温度和相相关屈服强度的指导。
The temperature- and phase-dependent yield strength plays a decisive role in the precise prediction of residual stresses in structural steel weldments. Since it is very expensive and time-consuming to directly measure the yield strength of a given steel by experimental method, numerical simulation has commonly been performed using the available yield strength of the same steel grades in scientific literature and material database or using the evaluated data based on the empirical formulations in standards/codes for the given steel. Nevertheless, the yield strengths of the same steel grades are usually different mainly due to the disparity in chemical composition and grain size. Furthermore, there are considerable differences in the yield strength at elevated temperatures obtained from the predictive functions for the given steel. Therefore, it is necessary to clarify the influence of the variation in temperature- and phase-dependent yield strength obtained from different methods on the predicted welding residual stresses in numerical simulation. In this study, numerical sensitivity analyses have been conducted to clarify the effect of yield strength on the predicted residual stresses in ultra-high strength steel S960 weldments. Furthermore, tensile tests and welding experiments were carried out for comparison and validation. Based on the current work, the effect of temperature- and phase-dependent yield strength on the calculated welding residual stresses is clarified. Besides, the reliability of the proposed functions to evaluate yield strength based on the tensile test results mainly from mild steels and conventional high strength steels is assessed for the recently developed ultra-high strength steel S960. Finally, guidance on how to economically determine the reliable temperature- and phase-dependent yield strength for S960 steel in numerical welding simulation is provided.