The Strengthened Mechanism of X70 Pipeline Steel Welded Joints by Laser Shock Processing

Abstract:

The X70 pipeline steel welded joint was processed to strengthen with laser shock wave, the structures of welded joint by laser shock wave were observed with Scanning Electric Microscope (SEM), and its surface residual stresses was analyzed with X-ray diffraction (XRD), the residual stress distributions of welded joint by laser shock processing were discussed, and the strengthened mechanism of X70 pipeline welded joint by laser shock processing was investigated. The experimental results shown that the phenomenon of grain fine is produced in the surface of X70 pipeline steel welded joint by laser shock processing, and compressive residual stress is formed in its surface layer, and improves the distribution of residual stress, which is benefit to increasing the capability of stress corrosion resistance for X70 pipeline steel welded joint.

• Periodical: Applied Mechanics and Materials (Volumes 44-47)
• Pages: 3114-3118
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.44-47.3114
• Online since: December 2010
• Authors: De Jun Kong, Chao Zheng Zhou
• Keywords: Laser Shock Processing (LSP), Microstructure, Residual Stress, Weld Joint, X70 Pipeline Steel

References

[1] Y.T. Li, Z.Y. Du, Y.Y. Tao and et al: Journal of Tianjin University Vol. 38 (2005), p.274.

[2] G.Y. Xie, D. Tang, Y. Zhang and et al: Journal of Chinese Society for Corrosion and Protection Vol. 28 (2008), p.86.

[3] C.B. Huang, G.F. Li, W. Yang: Corrosion & Protection Vol. 26 (2005), p.1.

[4] N. Xian, D.X. Liu, C.Q. Ren and et al: Corrosion Science and Protection Technology Vol. 20 (2008), p.465.

[5] Z.P. Wang, J.X. Wang, Z.H. Ji and et al: Chinese Journal of Mechanical Engineering Vol. 43 (2007), p.154.

[6] D.P. Wang, D. Zhou: Journal of Tianjin University Vol. 40 (2007), p.623.

[7] J.Z. Lu, Y.K. Zhang, W. Gu and et al : Journal of Jilin University (Engineering and Technology Edition) Vol. 38 (2008), p.304.

[8] D. Li; H.N. Chen, G. Liu and et al: Acta Metallrugica Sinica Vol. 37 (2001), p.980.

[9] X.L. Ye, Y.L. Zhu: Hot Working Technology Vol. 35 (2006), p.12.

Kling H P: Alexander L E (2nd Edition), New York, 1974, p.662.

[11] Y.K. Gao, M. Yao, P.G. Shao and et al: Journal of Materials Engineering and Performance, Vol. 12 (2003), p.507.

[12] Y.K. Zhang, J.Z. Lu, X.D. Ren and et al: Material and Design Vol. 30 (2009), p.1697.

[13] Y.Y. Tao, Z.Y. Du; Y.T. Li and et al: Transactions of The China Welding Institution, Vol. 25 (2004), p.105.

[14] H.Y. Du, J. Yang, J. Sun and et al: Powder Metallurgy Technology Vol. 25 (2007), p.13.

[15] Y.K. Gao, Y.F. Yin, X.B. Li and et al: Journal of Materials Engineering Vol. 46 (2002), p.40.