Surface integrity and fatigue behavior in shot-peening for high-speed milled 7055 aluminum alloy

被引：35
作者：
Yao, Changfeng [1 ]
Ma, Lufei [1 ]
Du, Yongxia [1 ]
Ren, Junxue [1 ]
Zhang, Dinghua [1 ]
机构：
[1] Northwestern Polytech Univ, Minist Educ, Key Lab Contemporary Design & Integrated Mfg Tech, Box 552, Xian 710072, Shaanxi, Peoples R China
来源：
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE | 2017年 / 231卷 / 02期
基金：
中国国家自然科学基金;
关键词：
7055 aluminum alloy; shot-peening; surface integrity; fatigue life; high-speed milling;
D O I：
10.1177/0954405415573704
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of shot-peening parameters on surface integrity of 7055 aluminum alloy is investigated based on shotpeening experiments. Surface integrity measurements, fatigue fracture analysis and fatigue life tests are conducted to reveal the effect of surface integrity on crack initiation and fatigue life. The results show that surface roughness increases significantly, and irregular pits and bumps appear on surface after shot-peening; grain on subsurface is refined and produces a shift and distortion in the pellets hit direction; compressive stress can be detected on all machined surfaces. Shot-peening parameters have significant impact on micro-hardness. In comparison with the milled specimen, fatigue life of peened specimens is improved by about 23.8, 3.96 and 1.01 times. Fatigue source zone transfers from stress concentration location on surface to subsurface due to the lower surface roughness and lager residual compressive stress.
引用
收藏
页码：243 / 256
页数：14
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