电焊机2025，Vol.55Issue(7)：89-96,8.DOI:10.7512/j.issn.1001-2303.2025.07.09
热输入对800 MPa级高强钢焊丝熔敷金属组织与性能的影响
Effect of Heat Input on Microstructure and Mechanical Properties of Deposited Metal of 800 MPa Grade High-Strength Steel Welding Wire
摘要
Abstract
A solid welding wire of 800 MPa high-strength steel was developed,and the effects of four heat inputs of 10 kJ/cm,13.7 kJ/cm,16.4 kJ/cm,and 22.1 kJ/cm on the microstructure and mechanical properties of the deposited metal were systematically studied using the polar active gas protection arc welding process.Through characterization methods such as optical microscopy(OM),scanning electron microscopy(SEM),and energy dispersive spectrometer(EDS),it was found that the microstructure of the deposited metal under the four heat input conditions was composed of granular bainite,plate bainite,acicular ferrite,side plate ferrite,and pre-eutectoid ferrite.With the increase of heat input,the content of plate bainite gradually decreased,the content of acicular ferrite first increased and then decreased,and the side plate ferrite,pre-eutectoid ferrite,and grain boundary ferrite successively precipitated and grew.Mechanical property tests showed that the tensile strength and yield strength of the deposited metal decreased with the increase of heat input,while the impact absorp-tion energy at-40℃first increased and then decreased.When the heat input was 13.7 kJ/cm,the comprehensive perfor-mance of the deposited metal was the best,with a tensile strength of 870 MPa,a impact absorption energy at-40℃of 62-104 J,and an average value of 84 J,showing excellent strength and toughness matching.关键词
熔敷金属/高强钢焊丝/热输入/微观组织/低温冲击韧性Key words
deposited metal/high-strength steel welding wire/heat input/microstructure/low temperature impact toughness分类
矿业与冶金引用本文复制引用
吕红英,苏霄鹏,刘健波,郝庆乐,陈睿博,钟素娟,龙伟民,关常勇..热输入对800 MPa级高强钢焊丝熔敷金属组织与性能的影响[J].电焊机,2025,55(7):89-96,8.基金项目
泰山产业领军人才工程战略性新兴产业创新类 （）
