The influence of machining induced surface integrity and residual stress on the fatigue performance of Ti-6Al-4V following polycrystalline diamond and coated cemented carbide milling
The influence of machining induced surface integrity and residual stress on the fatigue performance of Ti-6Al-4V following polycrystalline diamond and coated cemented carbide milling
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DOI：
10.1016/j.ijfatigue.2022.107054
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发表时间：
2022-06-15
影响因子：
6
通讯作者：
Jackson, Martin
中科院分区：
文献类型：
--
作者：
Childerhouse, Thomas;M'Saoubi, Rachid;Jackson, Martin
准确预测钛合金构件的疲劳寿命需要了解机械加工对冶金和微观机械亚表面状态的影响如何影响疲劳裂纹的形核和扩展。研究了硬质合金和高速聚晶金刚石加工过程中产生的表面完整性特征对粗晶和细晶Ti-6Al-4V疲劳行为的影响。较高的进给速度和较大的硬质合金刀具刃口半径促进了机械诱导的残余压应力，通过抑制裂纹萌生和减少组织变形和表面缺陷的有害影响，证明了机械诱导的残余压应力对疲劳寿命具有显著的提高作用。
Accurate fatigue life predictions of titanium alloy components requires an understanding of how the machining affected metallurgical and micro-mechanical subsurface condition influences fatigue crack nucleation and growth. This study investigates the influence of surface integrity features generated during carbide and highspeed polycrystalline diamond machining on the fatigue behaviour of coarse and fine-grained Ti-6Al-4V. Mechanically induced compressive residual stresses, promoted by higher feed rates and the larger cutting edge radii of carbide tools, have been demonstrated to provide an overriding enhancing effect on fatigue life due to crack initiation suppression and reducing the deleterious effects of microstructural deformation and surface imperfections.