固态相变对P91钢焊接残余应力的影响

发布时间：2018-04-27 06:38

本文选题：P钢 + 固态相变　；参考：《焊接学报》2015年09期

【摘要】：基于SYSWELD软件,首先模拟了P91的Satoh试验,得到加热、冷却过程中的温度-应力曲线.通过Satoh试验探讨了因固态相变引起的体积变化、屈服强度的变化和相变过程中的超塑性对残余应力形成过程的影响.随后,以平板TIG重熔模型为研究对象,系统讨论了固态相变对焊接残余应力分布和大小的影响.结果表明,体积膨胀对焊接残余应力的形成过程和最终应力的大小与分布有显著影响,它不仅可改变焊缝及HAZ处的应力大小,甚至可能改变应力的符号.相变引起的屈服强度变化对残余应力的形成及最终应力值的大小也有较明显的影响.相变塑性的影响比前两者小,它在相变过程中有一定的"应力松弛"效应.
[Abstract]:Based on SYSWELD software, the Satoh test of P91 is simulated, and the temperature-stress curves during heating and cooling are obtained. The effects of volume change, yield strength change and superplasticity on the formation of residual stress were investigated by Satoh test. Then, the influence of solid phase transition on the distribution and size of welding residual stress was discussed systematically, taking the TIG remelting model of flat plate as the research object. The results show that volume expansion has a significant effect on the formation process and final stress distribution of welding residual stress. It can not only change the stress size of weld and HAZ, but also possibly change the symbol of stress. The change of yield strength caused by phase transformation also has a significant influence on the formation of residual stress and the value of final stress. The effect of transformation plasticity is less than that of the former two, and it has a certain "stress relaxation" effect in the process of transformation.
【作者单位】：重庆大学材料科学与工程学院;东方汽轮机有限公司制造技术处;哈尔滨工业大学先进焊接与连接国家重点实验室;
【基金】：国家自然科学基金资助项目(51275544) 先进焊接与连接国家重点实验室开放课题重点项目中央高校基金(CDJZR12130036)
【分类号】：TG404

【共引文献】