Research on laser strengthening rail steel and its wear and friction properties

Xiaoli Li; Wenjin Liu; Minlin Zhong

doi:10.1117/12.577026

13 January 2005 Research on laser strengthening rail steel and its wear and friction properties

Xiaoli Li, Wenjin Liu, Minlin Zhong

Proceedings Volume 5629, Lasers in Material Processing and Manufacturing II; (2005) https://doi.org/10.1117/12.577026
Event: Photonics Asia, 2004, Beijing, China

Abstract

Laser strengthening of U71Mn rail steel was performed under different parameters using a narrow line-shaped CO₂ laser beam formed by newly developed binary optics. The microstructure, microhardness and wear resistance of the strengthened layers were investigated. Laser strengthening of PD₃ rail steel was performed using a normal circle-shaped beam, and the contact fatigue resistance of samples obtained by optimized laser processing parameters was investigated. The research results showed that a layer with fine martensite was produced on the surface of the rail steels after laser strengthening. The wear resistance to sliding friction was improved over 1.3-2.5 times than that of original steel U71Mn. And the rolling contact fatigue property was improved over 4-5 times than that of steel PD₃. The results also indicated that the laser strengthening processing parameters should be selected not to melt and overheat the surface.

Citation Download Citation

Xiaoli Li, Wenjin Liu, and Minlin Zhong "Research on laser strengthening rail steel and its wear and friction properties", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); https://doi.org/10.1117/12.577026

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