研究了保持时间和应变幅对C-276合金650℃下的低周疲劳寿命的影响.测试中采用应变幅为0.3％,0.35％,0.4％,0.45％和0.5％,保持时间为0,30和60 s的梯形波轴向总应变控制疲劳实验,并利用扫描电镜(SEM)观察了合金在各实验条件下的断口特征.结果表明,在同一保持时间下,随着应变幅的增加,裂纹扩展速率增大,疲劳寿命降低.而保持时间的引入对疲劳寿命的影响则与应变幅的大小有关:在较低的应变幅(0.35％～0.4％)下,引入保持时间,造成疲劳裂纹扩展速率增大,并且有微裂纹和空洞形成,在两者的共同作用下使疲劳寿命降低;在较高的应变幅(0.45％～0.5％)下,引入保持时间,造成微裂纹和空洞的焊合,使疲劳寿命不降反升.
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