Strengthen of Mechanism of 30CrMnSiNi2A Steel Welded Joint with Ultrasonic Impact Treatment

Abstract:

To analyze the strengthening mechanism of 30CrMnSiNi2A steel welded joint with ultrasonic impact treatment (UIT), the welded joint specimens were full coverage strengthened by the technology. The microstructure of the surface layer in fusion zone of the welded joint with and without UIT was investigated by optical microscopy (OM). The hardness and residual stress distributions along the thickness direction were also measured by micro-hardness tester and X-ray diffraction method respectively. The results show that the microstructure in fusion zone of the untreated 30CrMnSiNi2A steel welded joint were coarse dendrite, and there were many welding defects in this zone. UIT has the ability to achieve more compact microstructure with only small welding defects. The average hardness value of the treated specimens reached 571 HV, increased 14.4% as compared with that of the untreated specimen (499 HV). A residual compressive stress layer with thickness of 850 μm was also obtained from by UIT, and the maximum residual compressive stress was-347 MPa. The grain refinement, work hardening and residual compressive stress in fusion zone introduced by UIT increased its anti-fatigue performance.

• Periodical: Applied Mechanics and Materials (Volumes 599-601)
• Pages: 103-106
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.599-601.103
• Online since: August 2014
• Authors: Zhan Ming Li*, You Li Zhu, Xiao Kun Du
• Keywords: 30CrMnSiNi2A Welded Joint, Anti-Fatigue Mechanism, Ultrasonic Impact Treatment

References

[1] M.P. Nascimento, H.J.C. Voorwald, Considerations on corrosion and weld repair effects on the fatigue strength of a steel structure critical to the flight-safety, J. International Journal of Fatigue. 32(2010): 1200-1209.

DOI: 10.1016/j.ijfatigue.2009.12.017

[2] M.P. Nascimento, H.J.C. Voorwalda, J.C.P. Filho, Fatigue strength of tungsten inert gas-repaired weld joints in air plane critical structures, J. Journal of Materials Processing Technology. 211(2011): 1126-1135.

DOI: 10.1016/j.jmatprotec.2011.01.016

[3] M.X. Wang, G.N. Chen, Q. Pen, influence of shot peening on tension-tension fatigue property of laser aided forming aluminum alloy samples, J. Acta Aeronautica Et Astronautica Sinica. 32(7): 1351-1356.

[4] C.H. Lee, K.H. Chang, G.C. Jang, C.Y. Lee, Effect of weld geometry on the fatigue life of non-load-carrying fillet welded cruciform joints, J. Engineering Failure Analysis. 2009(16): 849-855.

DOI: 10.1016/j.engfailanal.2008.07.004

[5] C.D.M. Liljedahl, O. Zanellato, M. E. Fitzpatrick, J. Lin, L. Edwards, The effect of weld residual stresses and theirre-distribution with crack growth during fatigue under constant amplitude loading, J. Inter national Journal of Fatigue. 32(2010).

DOI: 10.1016/j.ijfatigue.2009.10.012

[6] D.P. Wang, L.X. Huo, Y.F. Zhang, H.Y. Jing, X.Q. Yang, Comparison of Ultrasonic Peening Method on Improving the Fatigue Behavior of Welded Joints with TIG Dressing under Variable-Amplitude Load, J. Acta Aeronautica Et Astronautica Sinica. 24(2): 183-188.

DOI: 10.1016/j.ijfatigue.2004.05.009

[7] H.Y. Fang. The welding structure, M. China Machine Press, Beijing, (2008).

[8] A.B. Pollack, F.J. Voellmecke, C.M. Sonsino, Fatigue strength improvement by ultrasonic impact treatment of highly stressed spokes of cast aluminium wheels, J. International Journal of Fatigue. 33(2011): 513-518.

DOI: 10.1016/j.ijfatigue.2010.09.017

[9] S. Roy, J.W. Fisher, B. T. Yen, Fatigue resistance of welded details enhanced by ultrasonic impact treatment (UIT), J. International Journal of Fatigue. 25 (2003): 1239-1247.

DOI: 10.1016/s0142-1123(03)00151-8

[10] D.Q. Yin, D.P. Wang, H.Y. Jing, L.X. Huo, The effects of ultrasonic peening treatment on the ultra-long life fatigue behavior of welded joints, J. Materials and Design, 31(2010): 3299-3307.

DOI: 10.1016/j.matdes.2010.02.006

[11] Z.M. Li, Y.L. Zhu, Y. Xin, Influence of Ultrasonic Impact Treatment on Fatigue Properties of 2A12 Aluminum Alloy Welded Joints, J. Journal of Aeronautical Materials, 31(2011): 28-32.

[12] F.R. Chen, L.X. Huo, Y.F. Zhang, L. Zhang, F.J. Liu, G. Chen, Effects of electron beam local post-weld heat-treatment on the microstructure and properties of 30CrMnSiNi2A steel welded joint, J. Materials Processing Technology, 129(2002): 412-417.

DOI: 10.1016/s0924-0136(02)00704-5

[13] Editorial Committee of China Aeronautical Material Handbook, China Aeronautical Material Handbook, M. Beijing: Standards Press of China, (1988).

[14] H.J. Wu, W. Yao, F.L. Huang, L. Sh. Zhang, Y.J. Li. Experimental Study on Dynamic Mechanical Properties of Ultrahigh Strength 30CrMnSiNi2A Steel, J. Transactions of Beijing Institute of Technology, 30(2010): 258-262.

[15] J.H. Fan, Multiscale Analysis for Deformation and Failure of Materials, M. Beijing: Science Press, (2008).