摘要
在不同焊接热输入(9,13,17 kJ·cm^(-1))下对0Cr13Ni4Mo马氏体不锈钢板进行多层多道电弧焊,研究了焊接热输入对焊接接头显微组织与力学性能的影响。结果表明:不同焊接热输入下所得焊接接头焊缝和热影响区的组织均为板条马氏体、少量δ铁素体和残余奥氏体;随着焊接热输入的增大,焊缝和热影响区的板条马氏体变粗大,δ铁素体含量增多;不同焊接热输入下焊接接头的抗拉强度和屈服强度分别约为810,600 MPa,均高于母材且符合项目规定,屈强比均小于0.9,接头的拉伸性能良好,拉伸后均在母材处断裂;随着焊接热输入增大,冲击吸收能量减小,焊接热输入为9,13 kJ·cm^(-1)下冲击断口中的韧窝尺寸略大且均匀,接头的冲击韧性更好;不同焊接热输入下焊缝的硬度为310~340 HV,其平均硬度高于热影响区和母材,随着焊接热输入的增加,焊缝和热影响区的硬度均略微降低。
Multi-layer and multi-pass arc welding was conducted on 0Cr13Ni4Mo martensitic stainless steel plates under different welding heat inputs(9,13,17 kJ·cm^(-1)),and the effect of welding heat input on the microstructure and mechanical properties of the welded joints was studied.The result show that the microstructures of welded joints under different welding heat inputs were all composed of lath martensite,a small amount ofδferrite and residual austenite.With the increase of welding heat input,the lath martensitic structure of the weld and the heat-affected zone became coarse,and theδferrite content increased.Under different welding heat inputs,the tensile strength and yield strength of the welded joints were approximately 810,600 MPa,respectively,which were higher than those of the base metal and complied with the project specification.The yield ratio was less than 0.9.The joints had good tensile properties,and fractured at the base metal after tension.With the increase of welding heat input,the impact absorption energy decreased.When the welding heat inputs were 9,13 kJ·cm^(-1),the size of the dimples in the impact fracture was slightly larger and more uniform,indicating the better impact toughness of the joint.The hardness of the weld under different welding heat inputs was 310‒340 HV,and the average hardness was higher than that of the heat affected zone and base metal.With increasing welding heat input,the hardness of the weld and the heat affected zone slightly decreased.
作者
周新宇
胡志华
栾道成
王正云
林绍斌
ZHOU Xinyu;HU Zhihua;LUAN Daocheng;WANG Zhengyun;LIN Shaobin(School of Materials Science and Engineering,Xihua University,Chengdu 610039,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2024年第9期38-43,共6页
Materials For Mechanical Engineering
基金
四川省科技支撑项目(20ZDYF2461,20ZDZX0042)
攀西试验区第六批项目(高成形性钒钛微合金化超高强汽车板开发及应用)
西华大学重点科研基金资助项目(Z203121)
西华大学校级教育教学改革项目(xjjg2023032)。
