激光冲击强化7075铝合金熔焊接头的疲劳性能

doi:10.7527/S1000-6893.2020.24320

Abstract

Abstract: Laser Shock Processing (LSP) offers deep compressive residual stress layers, low cold work hardening and flexible strengthening regions, drawing extensive attention in surface modification of welded structures. This study examines 2 mm thick 7075-T6 laser-arc hybrid welded joints treated by LSP. The hardness, residual stresses, fatigue life and fatigue crack initiation mechanism of the welded joints before and after LSP are investigated. It is found that the highest hardness in the weld zone increases from 152 HV before LSP to 175 HV after LSP. The effective strengthening layer depth is around 100 μm. The weld zone influenced by LSP is primarily characterized by residual compressive stress, with the highest compressive stress value of -200 MPa. The average fatigue life of nine welded joints subjected to LSP is around 675 937 cycles, approximately 2.6 times the fatigue life of those without LSP (262 297 cycles). The fatigue crack nucleation site is transferred from surface defects with high stress concentration to the subsurface below the strengthening layer, leading to improved fatigue crack initiation life.

Key words: laser shock processing, laser welding, 7075-T6 Al alloy, residual stress, fatigue life, fatigue crack initiation

CLC Number:

V261.8

WANG Lianqing, HU Ya'nan, CHE Zhigang, WU Shengchuan. Fatigue performance of laser shock processed fusion welded 7075 Al alloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(5): 524320-524320.

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Fatigue performance of laser shock processed fusion welded 7075 Al alloy

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