镍基高温合金K417热机械疲劳行为  

Thermal-mechanical Fatigue behavior of Nickel based Superalloy K417

作　　者：刘峰[1] 王跃臣[1] 张辉[1] 艾素华[1] 王中光[1] 

机构地区：[1]中国科学院金属研究所,沈阳110015

出　　处：《材料工程》2000年第11期32-34,37,共4页Journal of Materials Engineering

摘　　要：主要研究了 K417高温合金在不同实验条件下的热机械疲劳 (TMF)行为。在计算机辅助控制伺服液压疲劳实验机上进行了同相和反相热机械疲劳实验。实验结果表明 ,与等温低周疲劳性能相比较 ,无论是同相还是反相的热机械疲劳均使寿命大大降低 ,不同相位对 TMF性能产生不同的影响。此外 ,对于热机械疲劳过程中的塑性应变分量中的时间相关相 (蠕变 )和非时间相关相 (纯塑性变形 )应当分别进行考虑 ,这样才能对该合金的热机械疲劳行为有更加准确的认识。最后用 SEM对不同试验条件下的断口进行了详细观察 。The thermal mechanical fatigue behavior of a nickel based superalloy K417 was investigated Both In phase and Out phase thermal mechanical experiments were conducted using computer controlled servohydroulic uniaxial fatigue machine equipped with ceramic extensometer The experiment result shows that to compare with low cycle fatigue, both In phase and Out phase thermal mechanical fatigue leads much less fatigue lives, though there is difference between In phase and Out phase case Further more, to reveal the thermal mechanical fatigue mechanism more clearly, the time dependent component (creep) and time independent component (pure plastic deformation) of the inelastic components should be separated At last, SEM observation reveals the fractography,and the micro mechanism of cracking is discussed

关 键 词：高温合金 热机械疲劳 塑性应变 蠕变 镍基合金 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG113.255[金属学及工艺—金属材料]