电焊机2024，Vol.54Issue(10)：53-60,8.DOI:10.7512/j.issn.1001-2303.2024.10.06
铁镍基合金HT700P焊接接头力学性能和微观组织研究
Mechanical Properties and Microstructure of Iron-nickel Based Alloy HT700P Welded Joint
摘要
Abstract
The mechanical TIG was used to weld the large diameter pipe ring seam of iron-nickel based alloy HT700P.After the welding and stabilization heat treatment(980℃/3 h/AC)was qualified by non-destructive testing(100%PT+100%RT+100%PAUT),the welded joint was subjected to tensile strength,bending,hardness performance,impact,high temperature endurance performance,and microstructure tests.The test results showed that the tensile strength and yield strength of the welded joint at room temperature were higher than the lower limit of the HT700P alloy,and the bending test was qualified.The hardness of the BM and HAZ in the welded joint is significantly higher than weld seam,while there is no significant dif-ference in hardness between the base metal and heat affected zone.The average room temperature impact at the weld seam is 160.7 J,and at the HAZ is 102.3 J,both of which are higher than the lower limit of the HT700P alloy.The persistent strength of the welded joint for 105 hours is σ=138.3 MPa.The macro and micro metallographic structure of the welded joint is qualified,and the microstructure of the weld is austenite without the precipitation of harmful phases such as TCP.关键词
HT700P铁镍基合金/TIG/力学性能/微观组织/650℃超超临界电站Key words
HT700P iron-nickel based alloy/TIG/mechanical property/microstructure/650℃ultra-supercritical power plant分类
矿业与冶金引用本文复制引用
刁旺战,张松,王萍,徐祥久,黄超,李晓峰..铁镍基合金HT700P焊接接头力学性能和微观组织研究[J].电焊机,2024,54(10):53-60,8.基金项目
国家重点研发计划(2023YFB4102303) （2023YFB4102303）
黑龙江省自然科学基金(LH2022E077) （LH2022E077）
