【作者】 张国栋； 刘绍伦； 何玉怀； 周伯倬；

【Author】 ZHANG Guo-dong LIU Shao-lun HE Yu-huai ZHOU Bo-zhuo 1 Beijing Institute of Aeronautical Materials, Beijing 100095 China; 2 Shenyang Institute of Aeronautical Engine, Shenyang China

【机构】 北京航空材料研究院； 沈阳航空发动机研究所；

【摘要】 本文对DZ125定向凝固铸造镍基高温合金进行了应变比为-1.0的同相位三角波和同相位梯形波,550℃1000℃热/机械疲劳试验研究。试验结果表明:同相位三角波载荷情况下的热/机械疲劳寿命比同相位梯形波载荷情况下的热/机械疲劳寿命长。研究了在两种载荷情况下材料的热/机械疲劳循环应力影响。试样断口的微观分析表明:在热/机械疲劳过程中,同时存在疲劳、蠕变和氧化损伤。更多还原

【Abstract】 The thermal-mechanical fatigue behavior of DS superalloy DZ125 was studied. A basic cycle has been used without hold time and with hold time at high temperature to simulate only the transient behavior of critical part of a blade. Both triangular and trapezoidal wave shape signals with in-phase cycle and at maximum and minimum temperature of 550℃ and 1000℃, respectively. The ratio R_ε of minimum to maximum strain is-1. 0. It was found from test that the TMF life of in-phase cycle with triangular wave shape is longer than that of in-phase cycle with trapezoidal wave shape. Also the effect of hold time on cyclic stress under conditions of triangular and trapezoidal wave shape was studied. The thermal-mechanical fatigue mode was discussed. The results show that fatigue, creep and oxidation damage always developed during TMF.更多还原