316L不锈钢扩散焊接头在酸性氯化钠溶液中的应力腐蚀行为  

Stress corrosion behavior of diffusion bonding joints of 316L stainless steel in environment of acid NaCl solution

作　　者：黄毓晖[1] 杨博[1] 轩福贞[1] 涂善东[1] 

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《焊接学报》2011年第7期67-70,116,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50475068)

摘　　要：针对扩散焊接工艺整体受热的特殊性,采用固溶处理改善焊接过程可能出现的敏化问题.研究采用慢应变速率拉伸试验(SSRT)评价80℃时316L奥氏体不锈钢扩散焊接头在两种不同盐酸浓度的NaCl溶液中的应力腐蚀开裂(SCC)行为.测定了焊接接头的显微硬度分布,分析了扩散焊接头的力学性能与抗应力腐蚀性能之间的相关性.结果表明,应力腐蚀开裂发生在扩散焊接头处,焊接过程中并没有出现明显的敏化,焊后的固溶处理能改善焊接接头在该腐蚀环境下的抗应力腐蚀性能.Because of special diffusion bonding process,solution quenching was carried out to reduce the possibility of sensitization.Slow strain rate test（SSRT） was adopted in order to assess stress corrosion cracking（SCC） behavior of diffusion bonding joints of 316L stainless steel in the environment of acid NaCl solution with different HCl concentration at the temperature of 80 ℃.Microhardness distribution was measured,and the relationship between mechanical properties and stress corrosion resistance properties was also discussed in this study.Test result showed that stress corrosion cracking initiated at diffusion bonding joint,solution quenching after welding could improve stress corrosion cracking resistance properties in specific environment.

关 键 词：316L 扩散焊接头 慢应变速率拉伸试验 应力腐蚀开裂 固溶处理 

分 类 号：TG115.28[金属学及工艺—物理冶金]