电焊机2026，Vol.56Issue(8)：97-104,8.DOI:10.7512/j.issn.1001-2303.2026.08.10
焊接热循环及焊后热处理对新型Fe-Ni基高温合金焊接接头的组织和力学性能的影响
Effects of Welding Thermal Cycle and Post-Weld Aging on the Micro-structure and Mechanical Properties of GH2070P Fe-Ni-Based Superalloy Welded Joints
摘要
Abstract
The gas tungsten arc welding(GTAW)of the precipitation-strengthened Fe-Ni-based superalloy GH2070P in the aged condition was investigated,with emphasis on the influence of welding thermal cycling and post-weld heat treatment(PWHT)on the microstructural evolution and room-temperature mechanical properties of the welded joints.The base metals on each side of the joint were pre-treated at 800℃for 20 h and 4 h,respectively,followed by post-weld aging at 800℃for 4 h.The results reveal that the as-welded joint is free of macroscopic and microscopic defects.The precipitates in the base metal(BM)and heat-affected zone(HAZ)are identified as MC,M23C6,and γ' phases,while the weld metal(WM)contains M6C,MC,and a trace amount of γ'.The welding thermal cycle causes partial dissolution of M23C6 carbides and substantial dissolution of γ' precipitates in the HAZ,producing a softened zone approximately 1.5 mm in width,where tensile fracture occurs at room temperature.Following PWHT at 800℃for 4 h,M23C6 carbides and γ' precipitates re-precipitate in a fine,dispersed distribution within the HAZ,and a small quantity of γ' phase also forms in the WM.The hardness of the softened zone recovers to the BM level,and the tensile fracture location shifts from the HAZ to the WM center,with the tensile strength and yield strength increasing by 23.3％and 16.1％,respectively.The study demonstrates that post-weld aging effec-tively eliminates the HAZ softening problem in GH2070P welded joints,providing experimental support for the welding ap-plication of this alloy in ultra-supercritical boilers operating at 650℃and above.关键词
GH2070P高温合金/钨极氩弧焊/ERNiCrCoMo-1/焊接热循环/析出相与软化行为Key words
GH2070P superalloy/gas tungsten arc welding(GTAW)/ERNiCrCoMo-1/welding thermal cycle/precipitate dissolution and softening behavior分类
矿业与冶金引用本文复制引用
张松,徐祥久,刘海,刁旺战,王萍,赵卫君..焊接热循环及焊后热处理对新型Fe-Ni基高温合金焊接接头的组织和力学性能的影响[J].电焊机,2026,56(8):97-104,8.基金项目
国家重点研发计划(2023YFB4102303) （2023YFB4102303）
