粉末高温合金FGH4096的疲劳小裂纹扩展行为

杨秦政, 杨晓光, 黄渭清, 石多奇

Propagation Behaviors of Small Cracks in Powder Metallurgy Nickel-Based Superalloy FGH4096

YANG Qinzheng, YANG Xiaoguang, HUANG Weiqing, SHI Duoqi

图5 RL试样左侧主裂纹停滞与二次裂纹萌生过程

Fig.5 Stagnation of the left main crack and the initiation of the secondary crack in RL specimen recorded by the experimental system (a-c) and the associated SEM image (d) (N—number of cycle) (a) the main crack was stagnated at N = 1.895 × 105 cyc (b) the secondary crack was initiated at N = 1.955 × 105 cyc (c) the secondary crack connected with the main crack at N = 2.005 × 105 cyc (d) SEM image of the main area in Figs.5a-c