论文部分内容阅读
3种显微组织的TC11合金盘疲劳-蠕变交互作用试验的结果表明,循环应力σ_(max)在560～660MPa范围内,双态组织具有最好的疲劳-蠕变性能,网篮组织次之,等轴组织最差;其它应力范围,网篮组织寿命远高于等轴组织,也高于双态组织。SEM观察发现,3种组织裂纹源区和扩展早期均具有明显的解理特征,且解理平面的形成与裂尖塑性应变累积和高温氧化效应有关。随着裂纹扩展,解理迹象逐减,疲劳条纹和蠕变空洞骤增,交互作用明显增强。
The results of fatigue-creep interaction test of three kinds of microstructure TC11 alloy disks show that the cycle stress σ max (max) is in the range of 560-660 MPa, the two-state microstructure has the best fatigue-creep behavior, , The worst isosceles; other stress range, basket life is much higher than the equatorial tissue, but also higher than the bimodal organization. SEM observation showed that all the three types of cracks had obvious cleavage characteristics in the source region and early extension, and the formation of cleavage plane was related to the accumulation of plastic strain at the tip and the effect of high temperature oxidation. As the crack propagates, the cleavage signs decrease, the fatigue streaks and creep voids increase sharply, and the interaction increases obviously.