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Proceedings Paper

Research on laser strengthening rail steel and its wear and friction properties
Author(s): Xiaoli Li; Wenjin Liu; Minlin Zhong
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Paper 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.

Paper Details

Date Published: 13 January 2005
PDF: 7 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.577026
Show Author Affiliations
Xiaoli Li, Tsinghua Univ. (China)
Wenjin Liu, Tsinghua Univ. (China)
Minlin Zhong, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)

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