Surface integrity and fatigue behavior for high-speed milling Ti-10V-2Fe-3Al titanium alloy

被引：45
作者：
Yao C.-F. [1 ]
Tan L. [1 ]
Ren J.-X. [1 ]
Lin Q. [1 ]
Liang Y.-S. [1 ]
机构：
[1] Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, Shaanxi
来源：
Journal of Failure Analysis and Prevention | 2014年 / 14卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Fatigue fracture; Fatigue life; High-speed milling; Surface integrity; Ti-10V-2Fe-3Al titanium alloy;
D O I：
10.1007/s11668-013-9772-4
中图分类号：
学科分类号：
摘要：
Influence of cutting parameters on surface integrity when milling Ti-10V-2Fe-3Al is investigated based on high-speed cutting experiments. Surface integrity measurements, fatigue fractography analysis, and fatigue life tests are conducted to reveal the effect of surface integrity on crack initiation and fatigue life. The results show that under given experiment conditions, surface roughness decreases linearly when increasing cutting speed or decreasing feed per tooth. The latter has a greater impact on surface roughness than the former. Compressive stress can be detected on all machined surfaces. With the increase of feed per tooth or cutting speed, respectively, residual stress presents a linear increase. Cutting parameters have no significant impact on micro-hardness. When the surface roughness ranges from 0.5 to 1.0 μm, the effect of surface residual stress on fatigue life is more than that of surface roughness. When the surface residual compressive stress increases, the fatigue life improves significantly. Compared with 60 m/min, when cutting speed is 100 or 140 m/min, the surface roughness decreases, the surface residual compressive stress increases, and the fatigue life improves by 124 and 59%, respectively. Under a tensile load, fatigue crack on machined surface of Ti-10V-2Fe-3Al titanium alloy originates at the cross-edge of the specimen surface. With the increase of surface roughness, the area ratio of fatigue crack propagation zone, and fatigue fracture zone decreases. © 2013 ASM International.
引用
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页码：102 / 112
页数：10
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