钢铁研究学报, 2017, 29(1): 67-86.
10.13228/j.boyuan.issn1001-0963.20160050
采用旋转弯曲加载方式,评价了择优取向层片组织 Ti-47.5Al-2.5V-1.0Cr-0.2Zr(原子数分数,％)合金的室温高周疲劳性能,并采用扫描电镜对疲劳断口进行了观察和分析.结果显示,实验合金的应力-寿命(S-N)曲线呈现平直形态,符合Basquin方程；其条件疲劳极限为477 MPa,相当于其抗拉强度的83％.断口观察发现,疲劳试样以穿层片解理方式发生断裂.疲劳裂纹主要沿位于试样表面层、与外加应力成30°~90°的层片界面萌生,之后以穿层片方式发生扩展.在同一应力水平下,疲劳寿命随疲劳源尺寸增加而减少,疲劳源尺寸波动是导致疲劳寿命大幅分散的主要原因.
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