晶粒度对镍基高温合金疲劳损伤的影响

Effect of Grain Size on Fatigue Damage of Nickel-based Superalloy

研究了晶粒度对疲劳损伤机制的影响。运用光学显微镜、扫描电镜及原子力显微镜进行形貌观察,使用GIMP、STATISTICA和Mountain对得到的数据、图像进行处理。结果表明：晶粒尺寸较大的试样裂纹更易萌生,晶粒尺寸较小的试样裂纹萌生相对缓慢,而且具有优异的强度、硬度。

The influences of grain size on the fatigue damage mechanism were researched. The morphology was analyzed by utlizing optical microscope, scanning electron microscope and atomic force microscope observation, and then the acquired data and images were treated by GIMP, STATISTICA and Mountain. The results demonstrate that the samples with larger grain size are more likely to initiate crack, while the crack initiation of the samples with smaller grain size is relative slow, and they have excellent strength, hardness, a longer life and better rougnesss.