【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。更多还原

【Abstract】 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.更多还原