Comparison of fatigue crack propagation in nickel base superalloys RR1000 and Udimet 720Li
Comparison of fatigue crack propagation in nickel base superalloys RR1000 and Udimet 720Li
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DOI：
10.1179/1743284715y.0000000060
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发表时间：
2016-01
影响因子：
1.8
通讯作者：
H. Pang;M. Hardy;N. Hide;I. Wilcock;M. Henderson;P. Reed
中科院分区：
文献类型：
--
作者：
H. Pang;M. Hardy;N. Hide;I. Wilcock;M. Henderson;P. Reed
本文研究了温度、停留时间和环境对两种镍基涡轮机盘高温合金RR 1000和Udimet 720 Li疲劳裂纹扩展行为的影响。疲劳试验在室温下空气中使用20 Hz正弦加载波形进行，并在650和725°C的高温下空气和真空环境中使用梯形加载波形进行，最大载荷停留时间为1或20 s。这两种材料的疲劳裂纹扩展阻力是合理的微观结构的影响，以及合金化学的影响。
The effects of temperature, dwell and environment on the fatigue crack growth behaviour of two nickel base turbine disc superalloys RR1000 and Udimet 720Li are presented in the present paper. Fatigue tests were carried out at room temperature in air using a 20 Hz sinusoidal loading waveform and at elevated temperatures of 650 and 725°C in both air and vacuum environments using a trapezoidal loading waveform with dwell times at a maximum load of 1 or 20 s. The fatigue crack propagation resistance of both materials is rationalised in terms of the influence of microstructure as well as the effects of alloy chemistry.