Enhancement of Surface Property by Low-Energy Laser Peening without Protective Coating



Laser peening without protective coating (LPwC) has been applied to metallic materials using low energy pulses of a Q-switched and frequency-doubled Nd:YAG laser. Compressive residual stresses of several hundred megapascals were imparted on the surface of the materials. Redistribution of the residual stress in the top surface due to thermal loading was evaluated non-destructively by synchrotron radiation of SPring-8. Accelerating stress corrosion cracking (SCC) tests showed that LPwC prohibited SCC of sensitized materials. LPwC largely prolonged the fatigue lives of titanium alloys, aluminum alloys and austenitic stainless steels.




S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim




Y. Sano et al., "Enhancement of Surface Property by Low-Energy Laser Peening without Protective Coating", Key Engineering Materials, Vols. 345-346, pp. 1589-1592, 2007


August 2007




[1] D.W. See, J.L. Dulaney, A.H. Clauer and R.D. Tenaglia: Surface Eng., Vol. 18 (2002), p.32.

[2] Y. Sano, M. Kimura, K. Sato, M. Obata, A. Sudo, Y. Hamamoto, S. Shima, Y. Ichikawa, H. Yamazaki, M. Naruse, S. Hida, T. Watanabe and Y. Oono: 8th Int. Conf. on Nuclear Engineering (ICONE-8), Baltimore (2000).

[3] M. Yoda, I. Chida, S. Okada, M. Ochiai, Y. Sano, N. Mukai, G. Komotori, R. Saeki, T. Takagi, M. Sugihara and H. Yoriki: 14th Int. Conf. on Nuclear Engineering (ICONE-14), Miami (2006).

DOI: https://doi.org/10.1115/icone14-89228

[4] Y. Sano, M. Obata and T. Yamamoto: Welding International, Vol. 20 (2006), p.598.

[5] A. Demma, G. Frederick and C. King: 6th Int. Symp. on Contribution of Materials Investigations to Improve the Safety and Performance of LWRs, Fontevraud (2006).

[6] Y. Sano, M. Obata, T. Kubo, N. Mukai, M. Yoda, K. Masaki and Y. Ochi: Mater. Sci. Eng. A, Vol. 417 (2006), 334.

[7] Y. Sano, I. Altenberger, B. Scholtes, K. Masaki, Y. Ochi and K. Akita: 2006 ASME Pressure Vessels and Piping Division Conf., Vancouver (2006).

[8] Y. Sano, M. Yoda, N. Mukai, M. Obata, M. Kanno and S. Shima: J. At. Energy Soc. Japan, Vol. 42 (2000), p.567.

[9] M. Sato, Y. Sano, K. Kajiwara, H. Tanaka and K. Akita: 9th Int. Conf. on Synchrotron Radiation Instrumentation (SRI 2006), Daegu (2006).

[10] I. Altenberger, Y. Sano, I. Nikitin and B. Scholtes: 9th Int. Fatigue Congress (FATIGUE 2006), Atlanta (2006).

[11] T. Adachi, M. Shimanuki, H. Taguchi and Y. Sano: 2006 KSAS-JSASS Joint Int. Symp. on Aerospace Engineering, Busan (2006) Pitch horn Fatigue testing Pitch horn.