摘要
目的针对15-5PH钢零件再制造后性能调控缺乏试验和数据支撑的问题,研究热处理温度对15-5PH熔覆层微观组织及力学性能的影响。方法利用冷金属过渡(Cold Metal Transfer,CMT)工艺制备了连续、平整、无宏观缺陷的熔覆层,并采用不同温度对熔覆层进行了热处理。利用光学显微镜、XRD、SEM和EDS等手段分析了熔覆层的微观组织、物相组成,通过拉伸试验、剪切试验测试了熔覆层力学性能。结果焊态熔覆层主要由马氏体、铁素体、球状碳化物构成,不同区域的马氏体、铁素体形态有显著差异。随热处理温度的升高,焊道中间区域微观组织差异逐渐减小,尺寸有增加的趋势,经580℃、620℃热处理后,马氏体晶界上生成白色块状逆转变奥氏体,而且逆转变奥氏体含量和尺寸随温度的升高逐渐增加。此外,经450℃热处理后,熔覆层的屈服强度、抗拉强度、剪切强度达到最高,分别为1251、1318、674.9 MPa,伸长率仅为3.6%;当温度高于450℃时,随温度的升高,屈服强度、抗拉强度、剪切强度逐渐降低,伸长率增加。结论探明了热处理温度对再制造15-5PH熔覆层组织和性能的影响规律,为再制造15-5PH零件的热处理提供了依据。
To provide experimental and data support for performance control of remanufacturing 15-5PH steel parts,the work aims to study the effect of heat treatment temperature on the microstructure and mechanical properties of the 15-5PH cladding layer.Continuous,flat and macroscopic defect-free cladding layers were prepared by the Cold Metal Transfer(CMT)process,and the cladding layers were heat-treated at different temperatures.The microstructure and phase composition of the cladding layers were analyzed by means of optical microscope,XRD,SEM and EDS,and the mechanical properties of the cladding layers were tested by tensile test and shear test.The as-welded cladding layer was mainly composed of martensite,ferrite and spherical carbides,and the morphology of martensite and ferrite in different regions showed significant differences.With the increase of heat treatment temperature,the microstructure differences gradually decreased and the size showed an increasing trend.After heat treatment at 580℃and 620℃,white blocky reverse transformation austenite was formed on the martensite grain boundaries,and the content and size of reverse transformation austenite gradually increased with the increase of temperature.In addition,the yield strength,tensile strength and shear strength of the cladding layer reached the highest after heat treatment at 450℃,which were 1251,1318 and 674.9 MPa respectively,and the elongation was only 3.6%.When the temperature was higher than 450℃,the yield strength,tensile strength and shear strength gradually decreased with the increase of temperature,while the elongation increased.The effect law of heat treatment temperature on the microstructure and properties of the remanufactured 15-5PH cladding layer is clarified,providing a basis for the heat treatment of remanufactured 15-5PH parts.
作者
郭龙龙
刘浩然
张杰
吉效科
王仕强
张衡
陶桂红
黄建喜
GUO Longlong;LIU Haoran;ZHANG Jie;JI Xiaoke;WANG Shiqiang;ZHANG Heng;TAO Guihong;HUANG Jianxi(School of Mechanical Engineering,Xi'an Shiyou University,Xi’an 710065,China;School of Mechatronic Engineering Southwest Petroleum University,Chengdu 610500,China;General Machinery Manufacturing·Factory,Xi'an 710200,China;Safety and Environmental Quality Supervision and Testing Institute,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Sichuan Guanghan 618300,China;China Petroleum Bohai Equipment Research Institute,Tianjin 300280,China)
出处
《精密成形工程》
北大核心
2026年第3期165-172,共8页
Journal of Netshape Forming Engineering
基金
陕西省自然科学基础研究计划(2025JC-YBMS-545)
石油天然气装备教育部重点实验室开放基金(OGE202302-11)
西安市科技计划项目(23GXFW0076)。
