Tensile Properties of Friction Sir Welded Joint of Fe-32Mn-7Cr-1Mo-0.3N Steel at Cryogenic Temperature
In this study,the microstructures and cryogenic tensile properties of fiction stir welded and post-weld heat treated joints of 32Mn-7Cr-1Mo-0.3N steel were investigated.The particles containing residual tungsten distributed in the band structure of the joint were observed.And it caused the cryogenic brittle fracture of the as-welded joint.Post-weld water toughening resulted in the cryogenic intergranular brittleness of the joint.It can be speculated that the cryogenic intergranular brittleness is related to the non-equilibrium segregation of the solute atoms during the post-weld water toughening.The annealing at 550℃ for 30 minutes can effectively inhibit the cryogenic intergranular brittleness of the post-weld water toughening joint.The yield strength,ultimate tensile strength and the uniform elongation of the annealed joint are nearly about 95%,87% and 94% to the corresponding data of the base metal.
nitrogen-strengthened high manganese steel friction stir welding post-weld heat treatment abnormal grain growth tensile properties cryogenic intergranular fracture
LI Yijun FU Ruidong SANG Deli
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China;College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004,Hebei, China
国际会议
成都
英文
83-86
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）