双金属带锯条焊后热处理工艺优化  

Post-weld heat treatment process optimization of bimetal band saw

作　　者：王志永[1] 陈杨[1] 龚中良[1] 符式鹏 

机构地区：[1]中南林业科技大学机电工程学院,湖南长沙410004

出　　处：《金属热处理》2017年第9期45-49,共5页Heat Treatment of Metals

基　　金：湖南省科技计划项目(2015JC3094);湖南省高校科技创新团队支持计划(2014207)

摘　　要：以闪光对焊焊接的M42/X32双金属带锯条为研究对象,测试不同热处理工艺参数下焊缝组织、强度和硬度,对其焊后热处理(PWHT)工艺进行了优化。结果表明:试验锯条的最佳焊后热处理工艺参数为:600℃×4 s+620℃×7 s+590℃×4 s,空冷。在最佳热处理工艺参数水平下,焊缝组织为粒状渗碳体+回火索氏体,组织细化且分布均匀。在最佳热处理参数水平下,锯条的抗拉强度达到1400 MPa以上,焊缝的硬度降到44 HRC,依洛氏硬度折算的冲击韧度由17 J/cm^2增加到26 J/cm^2,接头韧性得到了显著提升。The post-welding heat treatment （PWHT） process of flash butt welded M42/X32 bimetal band saw was optimized based on microstructure observation, strength and hardness test under different heat treatment processes. The results show that the optimum PWHT process of the test band saw is ： 600 ℃× 4 s ＋ 620 ℃× 7 s ＋ 590 ℃×4 s, then cooling in the air. Under the optimum heat treatment parameters, the weld microstructure consists of granular carbide and tempered sorbite. The microstructure is uniformly fine globular structure. After the PWHT, tensile strength of the band saw can be maintained above 1400 MPa, while hardness of the welds decreases to 44 HRC, and the impact toughness conversed from the hardness increases from 17 J/cm2 to 26 J/cm2. The joint toughness has been significantly improved.

关 键 词：双金属带锯条 焊后热处理 显微组织 力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金] TG441.8[金属学及工艺—金属学]