High-cycle fatigue behavior of nickel-base single crystal superalloy
来源期刊：中国有色金属学报(英文版)2005年第z3期
论文作者：刘源 于金江 徐岩 孙晓峰 管恒荣 胡壮麒
文章页码：57 - 60
Key words：single crystal superalloy； high-cycle fatigue； fatigue limit stress
Abstract: High-cycle rotating bending fatigue behavior of SRR99 nickel-base single crystal alloy at 700 and 900℃ was investigated. The fatigue strengths for 107 cycles are 350 and 335MPa at 700 and 900℃, respectively. The total fatigue life becomes shorter when the temperature increases regardless of the loading stress and frequency. With the number of cycles decreasing, the difference in fatigue strength at the two temperatures becomes smaller. Typical fatigue rupture process including crack initiation site, crack propagation region and final rupture region exhibits at 700℃. The fracture surface is basically characterized by cleavage rupture at 900℃.
