Effects of laser shock peening (LSP) on laser-welded aluminium alloy joints filling Al + 1.0 wt-% CeO2 were investigated. Porosity ratio, microstructure, residual stress, hardness, tensile strength and fracture morphology were evaluated. Double-side LSP decreased the porosity ratio, refined microstructure, relieved the residual compressive stresses and increased the micro-hardness and tensile strength of the welds. Interaction between porosity and residual stress was also illustrated.
LuJ. Z., LuoK. Y., ZhangY. K., CuiC. Y., SunG. F., ZhouJ. Z., ZhangL., YouJ., ChenK. M. and ZhongJ. W.: ‘Grain refinement of LY12 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts’, Acta Mater., 2010,
58, 3984–3994. doi: 10.1016/j.actamat.2010.03.026
2.
KamalE. M., Abdel-WahabA. E. and MohammedE. E.: ‘Effect of aging time at low aging temperatures on the corrosion of aluminum alloy 6061’, Corros. Sci., 2012,
54, 167–173. doi: 10.1016/j.corsci.2011.09.011
3.
MaisonnetteD., SueryM. and NeliasD.: ‘Effects of heat treatments on the microstructure and mechanical properties of a 6061 aluminium alloy’, Mater. Sci. Eng. A, 2011,
528, 2718–2724. doi: 10.1016/j.msea.2010.12.011
4.
ParkY. W., YuJ. and RheeS.: ‘A study on the weld characteristics of 5182 aluminum alloy by Nd:YAG laser welding with filler wire for car bodies’, Int. J. Auto. Technol., 2010,
11, 729–736. doi: 10.1007/s12239-010-0086-1
5.
MohammadA., SeyfolahS., DavoodT., RezaS-R. and FarshadK.: ‘Experimental and numerical investigation of temperature distribution and melt pool geometry during pulsed laser welding of Ti6Al4V alloy’, Opt. Laser Technol., 2014,
59, 52–59. doi: 10.1016/j.optlastec.2013.12.009
6.
CieslakM. J. and FuerschbachP. W.: ‘On the weldablity, composition and hardness of pulsed and continuous Nd:YAG laser welds in aluminum alloys 6061, 5456 and 5086’, Metall. Trans. B, 1988,
19, 319–329. doi: 10.1007/BF02654217
7.
PastorM., ZhaoH., MartuhanitzR. P. and DebroyT.: ‘Porosity, underfill and magnesium loss during continuous wave Nd:YAG laser welding of thin plates of aluminum alloys 5182 and 5754’, Weld. J., 1999,
78, 207–216.
8.
SetoN., KatayamaS. and MatsunawaA.: ‘Porosity formation mechanism and suppression procedure in laser welding of aluminum alloys’, J. Jpn Weld. Soc., 2000,
18, 243–255. doi: 10.2207/qjjws.18.243
9.
BraunR.: ‘Nd:YAG laser butt welding of AA6013 using silicon and magnesium containing filler powders’, Mater. Sci. Eng. A, 2006,
426, 250–262. doi: 10.1016/j.msea.2006.04.033
10.
AhsanM. N., BradleyR. and PinkertonA. J.: ‘Microcomputed tomography analysis of intralayer porosity generation in laser direct metal deposition and its causes’, J. Laser Appl., 2011,
23, 022009. doi: 10.2351/1.3582311
11.
PrabhuA. W., VincentT., ChaudharyA., ZhangW. and BabuS. S.: ‘Effect of microstructure and defects on fatigue behavior of directed energy deposited Ti-6Al-4V’, Sci. Technol. Weld. Join., 2015,
20, 659–669. doi: 10.1179/1362171815Y.0000000050
12.
WuS. C., YuC., ZhangW. H., FuY. N. and HelfenL.: ‘Porosity induced fatigue damage of laser welded 7075-T6 joints investigated via synchrotron X-ray microtomography’, Sci. Technol. Weld. Join., 2015,
20, 11–19. doi: 10.1179/1362171814Y.0000000249
13.
SunG. F., ZhouR., LuJ. Z. and MazumderJ.: ‘Evaluation of defect density, microstructure, residual stress, elastic modulus, hardness and strength of laser deposited AISI 4340 steel’, Acta Mater., 2015,
84, 172–189. doi: 10.1016/j.actamat.2014.09.028
14.
RenX. D., ZhanQ. B., YangH. M., DaiF. Z., CuiC. Y., SunG. F. and RuanL.: ‘The effects of residual stress on fatigue behavior and crack propagation from laser shock processing-worked hole’, Mater. Design, 2013,
44, 149–154. doi: 10.1016/j.matdes.2012.07.024
15.
ZhangY. K., LuJ. Z., RenX. D., YaoH. B. and YaoH. X.: ‘Effect of laser shock processing on the mechanical properties and fatigue lives of the turbojet engine blades manufactured by LY2 aluminum alloy’, Mater. Design, 2009,
30, 1697–1703. doi: 10.1016/j.matdes.2008.07.017
16.
NursenS., SimgeG. I., ErhanA. and ArifD.: ‘Near surface modification of aluminum alloy induced by laser shock processing’, Opt. Laser Technol., 2014,
64, 235–241. doi: 10.1016/j.optlastec.2014.05.028
17.
HuangS., ZhouJ. Z., ShengJ., LuJ. Z., SunG. F., MengX. K., ZuoL. D. and RuanH. Y.: ‘Effects of laser energy on fatigue crack growth properties of 6061-T6 aluminum alloy subjected to multiple laser peening’, Eng. Fract. Mech., 2013,
99, 87–100. doi: 10.1016/j.engfracmech.2013.01.011
18.
ZhangL., ZhangY. K., LuJ. Z., DaiF. Z., FengA. X., LuoK. Y., ZhongJ. S., WangQ. W., LuoM. and QiH.: ‘Effects of laser shock processing on electrochemical corrosion resistance of ANSI 304 stainless steel weldments after cavitation erosion’, Corros. Sci., 2013,
66, 5–13. doi: 10.1016/j.corsci.2012.08.034
19.
ZhangL., LuJ. Z., ZhangY. K., LuoK. Y., ZhongJ. W., CuiC. Y., KongD. J., GuanH. B. and QianX. M.: ‘Effects of different shocked paths on fatigue property of 7050-T7451 aluminum alloy during two-sided laser shock processing’, Mater. Design, 2011,
32, 480–486. doi: 10.1016/j.matdes.2010.08.039
20.
ZhangL., LuoK. Y., LuJ. Z., ZhangY. K., DaiF. Z. and ZhongJ. W.: ‘Effects of laser shock processing with different shocked paths on mechanical properties of laser welded ANSI 304 stainless steel joint’, Mater. Sci. Eng. A, 2011,
528, 4652–4657. doi: 10.1016/j.msea.2011.02.054
21.
TodaH., MasudaS., BatresR., KobyashiM., AoyamaS., OnoderaM., FurusawaR., UesugiK., TakeuchiA. and SuzukiY.: ‘Statistical assessment of fatigue crack initiation from sub-surface hydrogen micropores in high-quality die-cast aluminum’, Acta Mater., 2011,
59, 4990–4998. doi: 10.1016/j.actamat.2011.04.049
22.
ChengC. M., ShanC. P., LeeI. K. and LinH. Y.: ‘Hot cracking of welds on heat treatable aluminum alloys’, Sci. Technol. Weld. Join., 2005,
10, 344–352. doi: 10.1179/174329305X40688
23.
IrizalpS. G., SaklakogluN. and YilbasB. S.: ‘Characrerization of microplastic deformation produced in 6061-T6 by using laser shock processing’, Int. J. Adv. Manuf. Technol., 2014,
71, 109–115. doi: 10.1007/s00170-013-5481-0
24.
RenX. D., RuanL., YuanS. Q., RenN. F., ZhengL. M., ZhanQ. B., ZhouJ. Z., YangH. M., WangY. and DaiF.Z.: ‘Dislocation polymorphism transformation of 6061-T651 aluminum alloy processed by laser shock processing: Effect of tempering at the elevated temperatures’, Mater. Sci. Eng. A, 2013,
578, 96–102. doi: 10.1016/j.msea.2013.04.034
25.
ElmesalamyA., FrancisJ. A. and LiL.: ‘A comparison of residual stresses in multi pass narrow gap laser welds and gas-tungsten arc welds in AISI 316L stainless steel’, Int. J. Pres. Ves. Pip., 2014,
113, 49–59. doi: 10.1016/j.ijpvp.2013.11.002
26.
FrancisJ. A., BhadeshiaH. K. D. H. and WithersP. J.: ‘Welding residual stresses in ferritic power plant steels’, Mater. Sci. Technol., 2007,
23, 1009–1020. doi: 10.1179/174328407X213116
27.
ZhouJ. Z., HuangS., ShengJ., LuJ. Z., WangC. D., ChenK. M., RuanH. Y. and ChenH. S.: ‘Effect of repeated impacts on mechanical properties and fatigue fracture morphologies of 6061-T6 aluminum subject to laser peening’, Mater. Sci. Eng. A, 2012,
539, 360–368. doi: 10.1016/j.msea.2012.01.125
Lozano-PerezS., KruskaK., IyengarI., TerachiT. and YamadaT.: ‘The role of cold work and applied stress on surface oxidation of 304 stainless steel’, Corros. Sci., 2012,
56, 78–85. doi: 10.1016/j.corsci.2011.11.021
30.
JiangR., EverittS., LewandowskiM., GaoN. and ReedP. A. S.: ‘Grain size effects in a Ni-based turbine disc alloy in the time and cycle dependent crack growth regimes’, Int. J. Fatigue, 2014,
62, 217–227. doi: 10.1016/j.ijfatigue.2013.07.014
31.
GuY. H., ChenC. F., BandopadhyayS., NingC. Y. and GuoY. J.: ‘Residual stress in pulsed dc microarc oxidation treated AZ31 alloy’, Surf. Eng., 2012,
28, 498–502. doi: 10.1179/1743294412Y.0000000002
32.
IveticG.: ‘Three-dimensional FEM analysis of laser shock peening of aluminium alloy 2024-T351 thin sheets’, Surf. Eng., 2011,
27, 445–453. doi: 10.1179/026708409X12490360425846
33.
NowakowskiA. F., BallilA. and NicolleauF. C. G. A.. ‘Passage of a shock wave through inhomogeneous media and its impact on gas-bubble deformation’, Phys. Rev. E, 2015,
92, 023028. doi: 10.1103/PhysRevE.92.023028
34.
TodaH., MinamiK., KoyamaK., IchitaniK., KobayashiM., UesugiK. and SuzukiY.: ‘Healing behavior of preexisting hydrogen micropores in aluminum alloys during plastic deformation’, Acta Mater., 2009,
57, 4391–4403. doi: 10.1016/j.actamat.2009.06.012
35.
WangA., ThomsonP. F. and HodgsonP. D.: ‘A study of pore and welding in hot rolling process’, J. Mater. Process. Technol., 1996,
60, 95–102. doi: 10.1016/0924-0136(96)02313-8
36.
ChaijaruwanichA., DashwoodR. J., LeeP. D. and NagaumiH.: ‘Pore evolution in a direct chill cast Al-6 wt% Mg alloy during hot rolling’, Acta Mater., 2006,
54, 5185–5194. doi: 10.1016/j.actamat.2006.06.029
37.
TalbotD. E. J.: ‘Effects of hydrogen in aluminum, magnesium, copper and their Alloys’, Int. Metall. Rev., 1975,
20, 166–184.
38.
TodaH., HidakaT., KobayashiT., UesugiK., TakeuchiA. and HorikawaK.: ‘Growth behavior of hydrogen micropores in aluminum alloys during high-temperature exposure’, Acta Mater., 2009,
57, 2277–2290. doi: 10.1016/j.actamat.2009.01.026
39.
GongM. F., QiaoS. R. and MeiF.: ‘Determining Young's modulus and Poisson's ratio of thin hard films’, Surf. Eng., 2014,
30, 589–593. doi: 10.1179/1743294414Y.0000000288
