期刊论文

Effect of surface coverage ratio of shot-peening on surface integrity of 7075 aluminum alloy

中文

材料热处理学报

1009-6264

2018

39

8

122-128

10.13289/j.issn.1009-6264.2018-0130

国家自然科学基金项目（51475483） 湖南省高校科技创新团队支持计划项目（2014207） 湖南省重点研发计划（2018NK2065）

本校为第一机构

通过应力测试、硬度测试、扫描电镜观察和表面粗糙度实验分析了不同喷砂表面覆盖率对7075铝合金表面完整性的影响。结果表明:在喷砂表面强化过程下,随着覆盖率的提高,表面粗糙度稳定在1.9 ~ 2.2 μm,表面硬化,且硬度稳步提升了约30%,压应力强度较喷砂前提高了约3倍,同时,改善了表层变形均匀性;覆盖率的提高,不仅提高表面完整性性能,而且对构件形状稳定有积极作用。对数据分析发现, 400%覆盖率的喷砂件自然时效后变形回弹可控制在( 3 ± 3) μm以内,说明300% ~ 400%覆盖率使材料表面完整性性能基本达到饱和状态。

Effects of different shot-peening surface coverage ratios on surface integrity of 7075 aluminum alloy were analyzed by means of stress test, hardness test, scanning electron microscopy(SEM) observation and surface roughness test. The results show that during the process of shot-peening surface strengthening, with the increase of coverage ratio, the surface roughness of the alloy is stable at 1.9-2.2 μm, the surface hardened, and the hardness increases steadily by about 30%, and the compressive stress strength is about 3 times higher than that ...