16MnR钢高压除氧器焊接接头裂纹的成因  

Cause of cracks in welded joints of higher-pressure deaerator made of 16MnR steel

作　　者：王少清 张宝昌[1] 焦伟[1] 葛兆祥 

机构地区：[1]徐州市锅炉压力容器检验所,哈尔滨焊接研究所,江苏省电力试验研究所

出　　处：《焊接学报》1994年第1期16-22,共7页Transactions of The China Welding Institution

摘　　要：本文采用电镜、Ｘ射线衍射分析、裂纹扩展速率ｄａ／ｄＮ及门槛值△Ｋ＿（ｔｈ）试验，研究了大力发电厂１６ＭｎＲ钢高压除氧器焊接接头裂纹的形成原因．结果表明，原发裂纹为延迟裂纹，运行工况下，裂纹以应力腐蚀裂纹（ＳＣＦ）方式扩展。In this paper,the cause of cracks in the welded joints of higher-pressuredeaertor made of 16MnR steel for thermal power plant was studied with electronmicroscopy,x-ray spectroscopic analysis,da/dN and △K_(th) test.The results show thatthe ckacks were the delay cracking which propagated in a way of stress corrosion`cracking in operation.

关 键 词：除氧器 焊接接头 裂纹 压力容器 

分 类 号：TG457.5[金属学及工艺—焊接]