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6 RL试样右侧二次裂纹萌生行为

Fig.6 Propagation of the right 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) (a) site of the main crack tip at N = 2.570 × 105 cyc (b) the secondary crack was initiated at N = 2.585 × 105 cyc (c) the secondary crack connected with the main crack at 2.595 × 105 cyc (d) SEM image of the main area in Figs.6a-c