Deep surface rolling for fatigue life enhancement of laser clad aircraft aluminium alloy

被引:71
作者
Zhuang, W. [1 ]
Liu, Q. [1 ]
Djugum, R. [1 ]
Sharp, P. K. [1 ]
Paradowska, A. [2 ]
机构
[1] Def Sci & Technol Org, Aerosp Div, Fishermans Bend, Vic 3207, Australia
[2] Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2232, Australia
关键词
Deep surface rolling; Laser cladding; Aluminium alloys; Fatigue; Residual stress; RESIDUAL-STRESS RELAXATION; CRACK CLOSURE;
D O I
10.1016/j.apsusc.2014.09.139
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Deep surface rolling can introduce deep compressive residual stresses into the surface of aircraft metallic structure to extend its fatigue life. To develop cost-effective aircraft structural repair technologies such as laser cladding, deep surface rolling was considered as an advanced post-repair surface enhancement technology. In this study, aluminium alloy 7075-T651 specimens with a blend-out region were first repaired using laser cladding technology. The surface of the laser cladding region was then treated by deep surface rolling. Fatigue testing was subsequently conducted for the laser clad, deep surface rolled and post-heat treated laser clad specimens. It was found that deep surface rolling can significantly improve the fatigue life in comparison with the laser clad baseline repair. In addition, three dimensional residual stresses were measured using neutron diffraction techniques. The results demonstrate that beneficial compressive residual stresses induced by deep surface rolling can reach considerable depths (more than 1.0 mm) below the laser clad surface. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:558 / 562
页数:5
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