摘要
对ZTC4合金室温高周疲劳断裂机理进行研究。结果表明:疲劳裂纹主要沿垂直和平行于α/β片层的方向扩展;裂纹萌生于试样表面、内部晶界以及α/β相界面;源区为类解理断裂,疲劳裂纹扩展区除有大量疲劳条带外,还出现扩展台阶和二次裂纹;断口形貌受晶体学取向和显微组织影响。
The fracture mechanism of high cycle fatigue on ZTC4 alloy was studied. The results show that the fatigue cracks are mainly vertical and paralleled to the direction of α/β lamellar. The fatigue cracks initiate at the surface of the sample, the internal grain boundaries and α/β phase boundaries. Lots of fatigue striations together with the fatigue sidesteps and secondary cracks generate in the crack propagation regions. The fracture morphologies are deeply affected by crystal orientation and microstructure.
出处
《热加工工艺》
CSCD
北大核心
2013年第10期93-95,共3页
Hot Working Technology
关键词
ZTC4合金
热等静压
组织
疲劳裂纹萌生
扩展
ZTC4 alloy
hot isostatic pressing
microstructure
fatigue crack initiation
propagation
