Microstructure evolution and mechanical properties of linear friction welded S31042 heat-resistant steel
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第4期
论文作者：Yanmo Li Yongchang Liu Chenxi Liu Chong Li Zongqing Ma Yuan Huang Zumin Wang Wenya Li
文章页码：653 - 659
摘 要：S31042 heat-resistant steel was joined by linear friction welding（LFW） in this study. The microstructure and the mechanical properties of the LFWed joint were investigated by optical microscopy, scanning electronic microscopy, transmission electron microscopy, hardness test and tensile test. A defect-free joint was achieved by using LFW under reasonable welding parameters. The dynamic recrystallization of austenitic grains and the dispersed precipitation of NbCrN particles resulting from the high stress and high temperature in welding, would lead to a improvement of mechanical property of the welded joint.With increasing the distance from the weld zone to the parent metal, the austenitic grain size gradually increases from 1μm to 150μm, and the microhardness decreases from 301 HV to 225 HV. The tensile strength（about 731 MPa） of the welded joint is comparable to that of the S31042 in the solution-treated state.
Yanmo Li1，Yongchang Liu1，Chenxi Liu1，Chong Li1，Zongqing Ma1，Yuan Huang1，Zumin Wang1，Wenya Li2
1. State Key Lab. of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University2. School of Materials Science and Engineering, Northwestern Polytechnical University
摘 要：S31042 heat-resistant steel was joined by linear friction welding（LFW） in this study. The microstructure and the mechanical properties of the LFWed joint were investigated by optical microscopy, scanning electronic microscopy, transmission electron microscopy, hardness test and tensile test. A defect-free joint was achieved by using LFW under reasonable welding parameters. The dynamic recrystallization of austenitic grains and the dispersed precipitation of NbCrN particles resulting from the high stress and high temperature in welding, would lead to a improvement of mechanical property of the welded joint.With increasing the distance from the weld zone to the parent metal, the austenitic grain size gradually increases from 1μm to 150μm, and the microhardness decreases from 301 HV to 225 HV. The tensile strength（about 731 MPa） of the welded joint is comparable to that of the S31042 in the solution-treated state.
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