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304不锈钢修复焊接的微观结构、残余应力及应力腐蚀开裂研究：第一部分——热输入的影响

A Study on Microstructure, Residual Stresses and Stress Corrosion Cracking of Repair Welding on 304 Stainless Steel: Part I-Effects of Heat Input.

作者信息

Luo Yun, Gu Wenbin, Peng Wei, Jin Qiang, Qin Qingliang, Yi Chunmei

机构信息

College of New Energy, China University of Petroleum (East China), Qingdao 266580, China.

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.

出版信息

Materials (Basel). 2020 May 25;13(10):2416. doi: 10.3390/ma13102416.

DOI:10.3390/ma13102416
PMID:32466186
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7288292/
Abstract

In this paper, the effect of repair welding heat input on microstructure, residual stresses, and stress corrosion cracking (SCC) sensitivity were investigated by simulation and experiment. The results show that heat input influences the microstructure, residual stresses, and SCC behavior. With the increase of heat input, both the -ferrite in weld and the average grain width decrease slightly, while the austenite grain size in the heat affected zone (HAZ) is slightly increased. The predicted repair welding residual stresses by simulation have good agreement with that by X-ray diffraction (XRD). The transverse residual stresses in the weld and HAZ are gradually decreased as the increases of heat input. The higher heat input can enhance the tensile strength and elongation of repaired joint. When the heat input was increased by 33%, the SCC sensitivity index was decreased by more than 60%. The macroscopic cracks are easily generated in HAZ for the smaller heat input, leading to the smaller tensile strength and elongation. The larger heat input is recommended in the repair welding in 304 stainless steel.

摘要

本文通过模拟和实验研究了补焊热输入对微观组织、残余应力及应力腐蚀开裂（SCC）敏感性的影响。结果表明，热输入会影响微观组织、残余应力和应力腐蚀开裂行为。随着热输入的增加，焊缝中的铁素体和平均晶粒宽度略有减小，而热影响区（HAZ）的奥氏体晶粒尺寸略有增加。模拟预测的补焊残余应力与X射线衍射（XRD）测量结果吻合良好。随着热输入的增加，焊缝和热影响区的横向残余应力逐渐降低。较高的热输入可以提高补焊接头的抗拉强度和伸长率。当热输入增加33%时，应力腐蚀开裂敏感性指数降低超过60%。热输入较小时，热影响区容易产生宏观裂纹，导致抗拉强度和伸长率较小。对于304不锈钢补焊，建议采用较大的热输入。

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