含20%Ni金属基陶瓷的热冲击疲劳  

Thermal Shock Fatigue Behavior of Ceramets Containing 20% Nickel

作　　者：徐根应[1] 刘宁[1] 许育东[1] 李健[2] 胡镇华[2] 崔昆[2] 

机构地区：[1]安徽工学院 [2]华中理工大学

出　　处：《稀有金属材料与工程》1997年第3期9-13,共5页Rare Metal Materials and Engineering

基　　金：国家教委"八.五"重点科研项目基金;安徽工学院基金

摘　　要：研究了含２０％Ｎｉ的Ｔｉ（Ｃ，Ｎ）基金属陶瓷的热冲击疲劳。试验结果表明：随循环温度的上升和冷却速率的加快，热冲击疲劳裂纹的形成孕育期缩短，裂纹扩展速率加快。缺口也使裂纹形成的孕育期缩短。观察还表明，热冲击疲劳断口中存在疲劳条纹。The thermal shock fatigue behavior of Ti(C,N) based ceramets containing 20% nickel has been studied The results show that the formation of thermal shock fatigue cracking is related to the nucleation, growth and joining of microvoids distributed at the interfaces of Ti(C,N)/Ni phases The incubation period of crack formation decreases and the rate of crack propagation increases with increasing cyclic temperature and cooling rate within the cycles The effects are mainly caused by increases of thermal stress and temperature gradients within the specimens The introduction of a notch also has the same effect SEM examination has some striae on the thermal shock fatigue fracture surfaces The crack propagation is a continuous process on a macroscopic scale although discontinuous microscopically

关 键 词：金属陶瓷 热冲击疲劳 断口形貌 疲劳条纹 

分 类 号：TG148[一般工业技术—材料科学与工程]