压力容器2025，Vol.42Issue(5)：22-29,8.DOI:10.3969/j.issn.1001-4837.2025.05.003
热输入对1000 Mpa级高强钢埋弧焊熔敷金属组织性能影响
Effect of heat input on the microstructure and properties of metal deposited by submerged arc welding of 1000 MPa high strength steel
摘要
Abstract
To address the issue of poor strength-toughness matching in the deposited metal of 1000 MPa grade high-strength steel,wire-grade submerged arc welding was adopted to study the influence law of welding heat input on the microstructure and properties.Combined with microstructure characterization and mechanical tests,it was found that with the increase of welding heat input,the microstructure of the deposited metal transforms from acicular ferrite(AF)to bainitic ferrite(BF)in sequence,and then to proeutectoid ferrite(PF)and quasi-polygonal ferrite(QF).The M-A constituents(martensite-retained austenite)evolve from uniform and dispersed distribution to coarsened blocky distribution.Among them,the content of retained austenite(A)shows a trend of first increasing and then decreasing,while the content of martensite(M)increases significantly when the welding heat input is high.With the increase of welding heat input,the tensile strength and yield strength of the deposited metal first increase and then decrease,the low-temperature impact toughness decreases significantly,and the fracture mechanism transforms from ductile fracture to cleavage fracture.The experimental results show that when the welding heat input is in the range of 18～25 kJ/cm,the deposited metal has excellent strength-toughness matching performance.The research results can provide a reference for the application in hydropower engineering.关键词
1000 Mpa级高强钢/熔敷金属/热输入/埋弧焊Key words
1000 Mpa grade high strength steel/weld metal/heat input/submerged arc welding分类
机械制造引用本文复制引用
冯伟,于庭祥,刘鑫,宋昌洪,刘满雨,张碧莹..热输入对1000 Mpa级高强钢埋弧焊熔敷金属组织性能影响[J].压力容器,2025,42(5):22-29,8.基金项目
黑龙江省重点研发计划项目(2022ZX04A01) （2022ZX04A01）
