期刊论文

Post-weld heat treatment process optimization of bimetal band saw

中文

金属热处理

0254-6051

2017

42

9

45-49

10.13251/j.issn.0254-6051.2017.09.010

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

本校为第一机构

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 stren...