摘要
某K418高温合金涡轮超转试验后发现裂纹,采用金相检验、化学成分分析、断口分析及能谱分析等方法,对裂纹的形成原因进行了分析。结果表明:由于涡轮熔模铸造用型壳在浇铸前未清洗干净或型壳结合不牢,使得在铸造过程中型壳中的物质被卷到液体合金里形成沿晶分布的夹杂物,造成晶界结合力弱化,从而导致涡轮在超转试验的作用力下沿晶界薄弱处产生裂纹。
Cracks were found on K418 high temperature alloy turbines after overrunning test,and means such as metallographic examination,chemical compositions analysis,fracture analysis and energy spectrum analysis were used to analyze the formation reason of the cracks.The result show because the investment casting mold shell was not cleaned up or the mold and the shell were not bonded tightly,material of the mold shell were involved into the liquid alloy and formed inclusions distributing along the grain boundaries during the casting process,which weakened the adhesion strength of the grain boundaries.So cracks formed along the weak grain boundaries under the action of overrunning test stress.
出处
《理化检验（物理分册）》
CAS
2011年第8期511-513,共3页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
K418高温合金涡轮
超转试验
熔模铸造用型壳
夹杂物
K418 high temperature alloy turbine
overrunning test
investment casting mold shell
inclusion
