表面技术2017，Vol.46Issue(3)：172-176,5.DOI:10.16490/j.cnki.issn.1001-3660.2017.03.026
表面喷丸强化处理对TC11钛合金疲劳性能的影响
Effects of Surface Shot Peening Strengthening on Fatigue Property of TC11 Titanium Alloy
摘要
Abstract
The work aims to improve the fatigue resistance of titanium alloy.The surface strengthening process of shot peening was used for surface strengthening treatment ofTC11 titanium alloy.Effects of shot peening strengthening,shot peening+second shot peening strengthening on surface roughness,residual stress,rnicrostructure and fatigue resistance of TC11 titanium alloy sample were studied.The shot peening treatment could introduce nearly 230 μm thick compressive residual stress field to the sample surface,but meanwhile increase the roughness value of sample surface.After second shot peening,both the surface residual compressive stress and peak residual compressive stress increased,while the location of peak compressive residual stress and thickness of compressive residual stress layer showed little change.The second shot peening had certain repair effect on the sample surface and decrease surface roughness value of the samples.The surface tissue was subject to obvious plastic deformation after shot peening,and the grain size was refined.Compared with the samples after shot peening,shot peening+second shot peening could further refine the sample surface organization.After shot peening,fatigue strength of the samples increased from 480 MPa to 540 MPa by 12.5％;after the second shot peening,the fatigue strength of the samples increased from 540 MPa to 570 MPa by 5.5％.The second shot peening has little influence on residual stress field of the surface,it improves the fatigue strength of titanium alloy mainly by reducing the surface roughness value and refining surface organization of the samples.关键词
钛合金/二次喷丸/表面粗糙度/残余应力/金相组织/疲劳强度Key words
titanium alloy/second shot peening/surface roughness/residual stress/metallographic structure/fatigue strength分类
矿业与冶金引用本文复制引用
李卫,严世榕,张乐..表面喷丸强化处理对TC11钛合金疲劳性能的影响[J].表面技术,2017,46(3):172-176,5.基金项目
湖南省教育厅研究课题(15C0977) （15C0977）
湖南省科技厅研究课题(2013FJ3019)Supported by the Department of Education of Hunan Province (15C0977) （2013FJ3019）
the Department of Science & Technology of Hunan Province(2013FJ3019) （2013FJ3019）
