摘要
通过高温浓碱溶液浸泡试验以及截面形貌观察,测试了690镍基合金机械拉拔式堵头(封装堵头试样)的应力腐蚀开裂(SCC)敏感性。结果表明:堵头胀接过渡区出现明显的沿晶应力腐蚀裂纹,其SCC敏感性明显高于堵头其他区域,这是由于胀接过渡区域局部塑性变形不连续而出现较高的局部残余应力,在高温浓碱溶液的共同作用下出现了显著的SCC。多个封装试样的测试结果表明本方法可以有效评价堵头试样的SCC敏感性。
The stress corrosion cracking(SCC)sensitivity of 690 nickel base alloy mechanical pull-out plug(encapsulated plug sample)was tested by immersion test in high temperature concentrated alkali solution and observation of cross section morphology.The results showed that there were obvious intergranular stress corrosion cracks in the expansion transition zone of the plug,and its SCC sensitivity was significantly higher than that of other areas of the plug.This was because the localized plastic deformation in the expansion transition zone was discontinuous,resulting in higher localized residual stress.Under the joint action of high-temperature concentrated alkali solution,significant SCC appeared.The test results of multiple encapsulated plugs indicated that this method could effectively evaluate the SCC sensitivity of plug samples.
作者
刘攀
丁明
胡卉桦
许鑫和
崔同明
吕战鹏
LIU Pan;DING Ming;HU Huihua;XU Xinhe;CUI Tongming;LU Zhanpeng(China Nuclear Power Operation Technology Corporation,Ltd.,Wuhan 430074,China;Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)
出处
《腐蚀与防护》
CAS
CSCD
北大核心
2023年第7期7-11,共5页
Corrosion & Protection
基金
国家自然科学基金项目(51771107)。
关键词
690合金
机械堵头
胀管过渡区
应力腐蚀开裂
碱性溶液
690 alloy
mechanical plug
roll transition zone
stress corrosion cracking
caustic solution
