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

Materials

Wei Peng¹  Yun Luo¹  Wenbin Gu¹  Qiang Jin¹  Qingliang Qin²  Chunmei Yi³ 

[1] College of New Energy, China University of Petroleum (East China), Qingdao 266580, China;School of Automation and Electronics Engineering, Qingdao University of Science and Technology, Qingdao 266061, China;Shandong Meiling Chemical Equipment Co., Ltd., Zibo 255430, China;

关键词: 304 stainless steel;    repair welding;    heat input;    residual stresses;    stress corrosion cracking;   

DOI  :  10.3390/ma13102416

来源: DOAJ

【 摘 要 】

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 δ-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.

【 授权许可】

Unknown