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

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。

Abstract: In this paper,the cause of cracks in the welded joints of higher-pressure deaertor made of 16MnR steel for thermal power plant was studied with electron mieroscopy,X-ray spectroscopic analysis,da/dN and △K_th test.The results show that the ckaeks were the delay cracking which propagated in a way of stress corrosion craeking in operation.