Analysis of residual stress on surface of AZ31 magnesium alloy after laser shock processing

LI Xingcheng; ZHANG Yongkang; ZHOU Jinyu; CHEN Jufang; LU Yalin

doi:10.7510/jgjs.issn.1001-3806.2016.01.002

To obtain maximum surface residual compressive stress by optimizing technological parameters of laser shock, the formula of residual compressive stress on the surface of AZ31 magnesium after laser shock process (LSP) was deduced from the theory of laser shock process and plastic deformation. Residual stress fields of AZ31 magnesium by LSP was simulated with ABAQUS software. Finite element analysis shows that laser shock wave pressure of optimal residual compressive stress field ranges from 1.2GPa to 1.7GPa. With the increase of load, residual stress on the surface of AZ31 magnesium increases. The maximum residual compressive stress is about 125MPa with loading range from 1.4GPa to 1.6GPa. There is a slight residual stresses hole phenomenon impact when load is 1.8GPa and a significant residual stresses hole phenomenon when load is more than 1.9GPa. When the load is 1.474GPa, the maximum residual stress is -128.5MPa. Experimental results are consistent with finite element analysis.

Analysis of residual stress on surface of AZ31 magnesium alloy after laser shock processing

Corresponding author: ZHANG Yongkang, ykzhang@ujs.edu.cn;

1. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China;

2. School of Mechanical Engineering, Southeast University, Nanjing 211189, China

Received Date: 2015-02-08

Accepted Date: 2015-03-17

Available Online: 2016-01-25

Abstract: To obtain maximum surface residual compressive stress by optimizing technological parameters of laser shock, the formula of residual compressive stress on the surface of AZ31 magnesium after laser shock process (LSP) was deduced from the theory of laser shock process and plastic deformation. Residual stress fields of AZ31 magnesium by LSP was simulated with ABAQUS software. Finite element analysis shows that laser shock wave pressure of optimal residual compressive stress field ranges from 1.2GPa to 1.7GPa. With the increase of load, residual stress on the surface of AZ31 magnesium increases. The maximum residual compressive stress is about 125MPa with loading range from 1.4GPa to 1.6GPa. There is a slight residual stresses hole phenomenon impact when load is 1.8GPa and a significant residual stresses hole phenomenon when load is more than 1.9GPa. When the load is 1.474GPa, the maximum residual stress is -128.5MPa. Experimental results are consistent with finite element analysis.

HTML

Reference (19)

[1]	PEI X. The effects of mechanical property and structural changes in the surface material induced by laser shock processing on AZ91 magnesium[D]. Zhenjiang:Jiangsu University, 2010:31-32(in Chinese).
[2]	PEYRE P, FABBRO R, MERRIEN P, et al. Laser shock processing of aluminum alloys. Application to high cycle fatigue behavior[J]. Materials Science and Engineering, 1996, A210(1):102-113.
[3]	CHEN J F. Study on laser surface modification of AM50 magnesium alloy[D]. Zhenjiang:Jiangsu University, 2008:71-74(in Chinese).
[4]	YANG G T. Plastic dynamics[M]. Beijing:Higher Education Press,2011:115-120(in Chinese).
[5]	GUO W G,LI Y L,SUO T. Stress wave basis concise tutorial[M].Xi'an:Northwestern Polytechnical University Press,2007:105-108(in Chinese).
[6]	YU H Q,CHEN J D. Metal plasticity forming theory[M]. Beijing:Mechanical Industry Press,1999:103-105(in Chinese).
[7]	ZHOU N,QIAO D J. Pulse irradiation dynamics[M]. Beijing:National Defence Industry Press,2008:185-187(in Chinese).
[8]	LI X C, ZHANG Y K, CHEN J F,et al.Effect of laser shock processing on stress corrosion cracking behaviour of AZ31 magnesium alloy at slow strain rate[J]. Materials Science and Technology,2013, 29(5):626-630.
[9]	ZHANG X Q,ZHANG Y K,GU Y Y. Finite element simulation of residual stress induced by laser peening[J]. Journal of Plasticity Engineering,2008,15(4):626-630.
[10]	WANG Y,FAN S X,GAN F, et al. Investigation into micro-extrusion forming based on laser shock in 3003 aluminum alloy[J]. Laser Technology, 2013, 37(6):820-824(in Chinese).
[11]	LI Z Y, ZHU W H, CHEN J Y. Experimental study of high-power pulsed laser induced shock waves in aluminum targets[J]. Chinese Journal of Lasers, 1997, 24(3):259-262.
[12]	HUANG Y,JIANG Y F,JIN H, et al. Propagation of shock wave induced by ring laser and its effect on spalling[J]. Laser Technology, 2013, 37(3):301-305(in Chinese).
[13]	BALLARD P. Residual stress induced by rapid impact-application of laser shocking[D]. Paris,France:Ecole Polytechnique, 1991:74-76.
[14]	HU Y X, GONG C M, YAO Z Q, et al. Investigation on the non-homogeneity of residual stress field induced by laser shock peening[J]. Surface Coatings Technology, 2009, 203(23):3503-3508.
[15]	PEYRE P, FABBRO R, MERRIEN P, et al. Laser shock processing of aluminium alloys:application to high cycle fatigue behaviour[J]. Materials Science and Engineering, 1996, A 210(1/2):102-113.
[16]	JIANG Y F,LAI Y L,ZHANG L. Investigation of residual stress hole on a metal surface by laser shock[J]. Chinses Journal of Lasers,2010,37(8):2073-2079(in Chinese).
[17]	DAI F Z. Mechanism research of nano-second laser induced shock wave on the surface topography and performance of metals[D]. Zhenjiang:Jiangsu University, 2013:59-62(in Chinese).
[18]	HUANG L W,LONG K,HUANG Y, et al.Research of spalling on 3003H16 aluminium alloy sheet under laser shock wave[J]. Laser Technology, 2013, 37(2):270-273(in Chinese).
[19]	ZHANG Y K, YOU J, LU J Z, et al. Effects of laser shock processing on stress corrosion cracking susceptibility of AZ31B magnesium alloy[J]. Surface Coatings Technology, 2010, 204(24):3947-3953.

Analysis of residual stress on surface of AZ31 magnesium alloy after laser shock processing

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views