采用轴向拉拉的加载方式对蒸汽发生器传热管材料TA16和690进行高周疲劳试验。试验环境为室温空气中。根据试验数据绘制两种材料的应力-循环(S-N)曲线,并通过拟合公式获得相应循环周次下的疲劳极限。对疲劳断口进行扫描电镜(SEM)观察分析,疲劳过程为裂纹源产生、扩展和断裂。 High-cycle fatigue test was carried out on the steam generator heat transfer tube materials TA16 and 690 by using the axial pulling method. The test environment is room temperature air. The stress-cycle (S-N) curves of the two materials were plotted based on the experimental data, and the fatigue limit under the corresponding cycle was obtained by fitting the formula. The fatigue fracture was observed by scanning electron microscopy (SEM), and the fatigue process was the generation, propagation and fracture of the crack source.