Surface integrity and fatigue behavior when turning γ-TiAl alloy with optimized PVD-coated carbide inserts

被引：49

作者：

Yao, Changfeng ^{[1
]}

Lin, Jiannan ^{[1
]}

Wu, Daoxia ^{[1
]}

Ren, Junxue ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Minist Educ, Key Lab Contemporary Design & Integrated Mfg Tech, Xian 710072, Shaanxi, Peoples R China

来源：

CHINESE JOURNAL OF AERONAUTICS | 2018年 / 31卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Fatigue behavior; Microhardness; Residual stress; Surface roughness; gamma-TiAl alloy; Tool wear; TITANIUM ALUMINIDES; TOOL WEAR; LIFE;

D O I：

10.1016/j.cja.2017.06.002

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

This paper presents a comprehensive investigation on the effects of tool and turning parameters on surface integrity and fatigue behavior in turning c-TiAl alloy. The wear of inserts surface, cutting forces, and surface roughness were studied to optimize PVD-coated carbide inserts. Surface topography, residual stresses, microhardness, and microstructure were analyzed to characterize the surfaces layer under different turning parameters. Surface integrity and fatigue life tests of c-TiAl alloy were conducted under turning and turning-polishing processes. The results show that compared to CNMG120412-MF4, CNMG120408-SM is more suitable because it obtained low cutting force, surface roughness, and tool wear. With increasing the cutting speed and depth, the depths of the compressive residual stress layer, hardening layer, and plastic deformation layer increased. For turning and turning-polishing specimens, the compressive residual stress was relaxed by less than 20%-30% after 10 7 cycles. The fatigue life of a turning-polishing specimen with R-a = 0.15 mu m has increased 3 times from that of a turning specimen with R-a = 0.43 mu m. (C) 2017 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

引用

页码：826 / 836

页数：11

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