Influence of High Temperature Processing on the Substructure of Laser Shock Processed Titanium Alloy

Abstract:

The paper aims to study the influence of high temperature processing on the substructure of laser shock processed titanium alloy. The titanium alloy specimens were first treated by laser shock processing (LSP), then treated at 700°C for three hours and air cooled to the room temperature to investigate the influence of the high temperature processing. To evaluate such influence, the hardness and substructure on the surface were investigated by micro hardness tester and transmission electron microscope (TEM), respectively. Results show that after three times LSP, the hardness of TC11 alloy was improved by 30.9%. The cause of such an improvement in hardness is that the crystal grains in the surface layer under the shock wave stress were strongly deformed, causing a dynamic recrystallization. The substructure is mainly twin crystals, highly tangled and dense dislocations. After high temperature processing in vacuum, the average hardness is decreased by 12% compared to that of the specimens after LSP. And the substructures are mainly small dislocation, nanocrystalline.

• Periodical: Applied Mechanics and Materials (Volume 528)
• Pages: 44-53
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.528.44
• Online since: February 2014
• Authors: Yin Qun Hua, Yu Chuan Bai, Yun Xia Ye, Qing Xue, Hai Xia Liu, Rui Fang Chen, Kang Min Chen
• Keywords: High Temperature Processing, Laser Shock Processing, Substructure, Titanium Alloy

References

[1] X. Tong, et al. Thermal fatigue resistance of H13 steel treated by selective laser surface melting and CrNi alloying, Appl. Surf. Sci., (2013), http: /dx. doi. org/10. 1016/j. apsusc. 2013. 01. 209.

DOI: 10.1016/j.apsusc.2013.01.209

[2] J.Z. Lu, K.Y. Luo, D.K. Yang, X.N. Cheng, J.L. Hu, F.Z. Dai, H. Qi, L. Zhang, J.S. Zhong, Q.W. Wang, Y.K. Zhang, Effects of laser peening on stress corrosion cracking (SCC) of ANSI 304 austenitic stainless steel, Corros. Sci., 2012, 60, 145-152.

DOI: 10.1016/j.corsci.2012.03.044

[3] H. Amar, V. Vignal, H. Krawiec, C. Josse, P. Peyre, S.N. da Silva, L.F. Dick, Influence of the microstructure and laser shock processing (LSP) on the corrosion behaviour of the AA2050-T8 aluminium alloy, Corros. Sci., 2011, 53, 3215-3221.

DOI: 10.1016/j.corsci.2011.05.066

[4] M. Morales, J.A. Porro, M. Blasco, C. Molpeceres, J.L. Ocana, Numerical simulation of plasma dynamics in laser shock processing experiments. Appl. Surf. Sci., 2009, 255, 5181-5185.

DOI: 10.1016/j.apsusc.2008.09.067

[5] Hyuntaeck Lim, Pilkyu Kim, Hoemin Jeong, Sungho Jeong, Enhancement of abrasion and corrosion resistance of duplex stainless steel by laser shock peening, J. Mater. Process. Tech., 2012, 212, 1347-1354.

DOI: 10.1016/j.jmatprotec.2012.01.023

[6] L. Zhang, J.Z. Lu, Y.K. Zhang, K.Y. Luo, J.W. Zhong, C.Y. Cui, D.J. Kong, H.B. Guan, X.M. Qian, Effects of different shocked paths on fatigue property of 7050–T7451 aluminum alloy during two-sided laser shock processing', Mater. Des., 2011, 32, 480-486.

DOI: 10.1016/j.matdes.2010.08.039

[7] Igor Altenberger, Ravi K. Nalla, Yuji Sano, Lothar Wagner , Robert O. Ritchie, On the effect of deep-rolling and laser-peening on the stress-controlled low- and high-cycle fatigue behavior of Ti-6Al-4V at elevated temperatures up to 550℃, Int. J. Fatigue, 2012, 44, 292-302.

DOI: 10.1016/j.ijfatigue.2012.03.008

[8] Myriam Gharbi, Patrice Peyre, Cyril Gorny, Muriel Carin, Simon Morville, Philippe Le Masson, Denis Carron, Rémy Fabbro, Influence of various process conditions on surface finishes induced by the direct metal deposition laser technique on a Ti–6Al–4V alloy, J. Mater. Process. Tech., 2013, 213, 791-800.

DOI: 10.1016/j.jmatprotec.2012.11.015

[9] Y.K. Zhang, J. You, J.Z. Lu, C.Y. Cui, Y.F. Jiang, X.D. Ren, Effects of laser shock processing on stress corrosion cracking susceptibility of AZ31B magnesium alloy, Surf. Coat. Technol., 2010, 204, 3947-3953.

DOI: 10.1016/j.surfcoat.2010.03.015

[10] X.C. Zhang, Y.K. Zhang, J.Z. Lu, F.Z. Xuan, Z.D. Wang, S.T. Tu, Improvement of fatigue life of Ti–6Al–4V alloy by laser shock peening, Mater. Sci. Eng., 2010, A527, 3411-3415.

DOI: 10.1016/j.msea.2010.01.076

[11] P. Peyre, C. Carboni, P. Forget, G. Beranger, C. Lemaitre, D. Stuart, Influence of thermal and mechanical surface modifications induced by laser shock processing on the initiation of corrosion pits in 316L stainless steel, J. Mater. Sci., 2007, 42, 6866-6877.

DOI: 10.1007/s10853-007-1502-4

[12] Y.K. Zhang, Y.Y. Gu, X.Q. Zhang, J.G. Shi, J. Zhou, Study of the mechanism of overlays acting on laser shock waves, J. Appl. Phys. 100 (2006) 103517-1–103517-6.

DOI: 10.1063/1.2364037

[13] Liucheng Zhou, Yinghong Li, Weifeng He, Guangyu He, Xiangfan Nie, Donglin Chen, Zhilin Lai, Zhibin An, Deforming TC6 Titanium alloys at ultrahigh strain rates during multiple laser shock peening, Mat. Sci. Eng. A-Struct., ht tp : /dx. doi. org/10. 1016/j. msea. 2013. 04. 070.

DOI: 10.1016/j.msea.2013.04.070

[14] H.X. Liu, Y. Hu, X. Wang, Z.B. Shen, P. Li, C.X. Gu, H. Liu, D.Z. Du, C. Guo, Grain refinement progress of pure titanium during laser shock forming (LSF) and mechanical property characterizations with nanoindentation, Mat. Sci. Eng. A-Struct., 2013, 564, 13–21.

DOI: 10.1016/j.msea.2012.11.087