摘要
钛合金整体离心叶轮内孔采用F275橡胶圈密封,在工作一段时间后发现与橡胶圈接触的内孔表面存在大量裂纹。采用断口宏微观观察、能谱成分检测、金相检验等试验方法,对裂纹性质和原因进行了研究。结果表明,离心叶轮内孔表面裂纹性质为应力腐蚀开裂,裂纹形成主要原因是F275橡胶圈在约400℃温度下裂解,使TC11钛合金在含氟气氛中形成应力腐蚀裂纹。模拟试验很好的验证了裂纹性质和产生原因。
The inner hole of titanium alloy centrifugal impeller was sealed with a F275 rubber ring.After a period of service,some cracks were found on the inner hole surface of the centrifugal impeller.The mode and causes of the cracks were analyzed by fractography,chemical composition analysis and metallographic examination.The results show that the inner hold surface cracks of the centrifugal impeller are caused by stress corrosion.The F275 rubber ring can decompose at the service temperature of 400 ℃,and then the TC11 titanium alloy is exposed to the atmosphere containing fluorine. As a result, the cracks initiate owing to stress corrosion under the service stress. Finally, the mode and cause of the cracks for the material are validated by simulation tests.
出处
《金属热处理》
CAS
CSCD
北大核心
2009年第12期100-103,共4页
Heat Treatment of Metals
关键词
钛合金
应力腐蚀
氟橡胶
叶轮
准解理
titanium alloy
stress corrosion
fluorine rubber
impeller
quasi cleavage
