Research on Ultra-High Cycle Fatigue Property of 45 Steel

Abstract:

Fatigue property of 45 steel was studied in this paper with the method of ultrasonic fatigue testing, and SEM was used to analyze microscopic characteristics of the fatigue fracture. Fatigue test results show that: S-N curves descend continuously after 10⁸ cycles, there is no fatigue limit as the traditional fatigue conception describes. Therefore, it is very dangerous to design welded structure working in the ultra-high cycle interval with the fatigue strength corresponding to 5×10⁶ cycles. In the super-long life range, the fatigue property of welded joints is worse than the base metal. SEM analysis shows that: fatigue crack mainly initiates from the defects in the surface or sub-surface.

• Periodical: Advanced Materials Research (Volumes 295-297)
• Pages: 1911-1914
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.295-297.1911
• Online since: July 2011
• Authors: Ling Ling Jin, Cai Yan Deng, Dong Po Wang, Rui Ying Tian
• Keywords: 45 Steel, Fatigue Property, S-N Curve, Super-Long Life

References

[1] Cheng'en Zhou,Jijia Xie,Youshi Hong:Journal of Mechanical Strength, Vol. 26 (5) (2004) pp.526-533

[2] Jiming Zhang, Jianfeng Zhang,Zhenguo Zhang:Acta Metall Sin,Vol. 40 (2004), p.846 (in Chinese).

[3] Liangchen Wu, Dongpo Wang,Caiyan Deng, Kang Wang: Transaction of the China WeldingInstitution. Vol. 29(3) (2003), pp.117-120 (in Chinese).

[4] Asami K, Sugiyama Y: Heat Treatment Technol Assoc. Vol. 25 (1985), p.147.

[5] Youshi Hong, Aiguo Zhao, Gui'an Qian: Cross-strait Workshop on Engineering Mechanics 2009, pp.152-157 (in Chinese).

[6] Sakai T, Sato Y, Oguma N: Fatigue and Fracture of Engineering Materials and Structures. Vol.25 (2002), pp.765-773.