Research on laser melting/alloying combined strengthening of the camshaft of air-cooled diesel engine

Wenjin Liu; Minlin Zhong; Haiyun Zhao; Hongjun Zhang; Weimin Zhang; Guoqing Huang

doi:10.1117/12.237744

8 April 1996 Research on laser melting-alloying combined strengthening of the camshaft of air-cooled diesel engine

Wenjin Liu, Minlin Zhong, Haiyun Zhao, Hongjun Zhang, Weimin Zhang, Guoqing Huang

Proceedings Volume 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics; (1996) https://doi.org/10.1117/12.237744
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

This paper reported the research results on 3 kw cw CO₂ laser melting-alloying combined strengthening of the camshaft of air-cooled diesel engine used in the desert oil field. The 45 steel camshaft was pretreated with the conventional quenching and high temperature tempering. A focused laser beam with power density 1.5 - 1.7 X 10⁴ w/cm² was used to alloy the cam lobe area, while the other area of the cam was treated by laser melting using a focused 12 X 1.5 mm rectangular beam (power density 1.1 X 10⁴ w/cm²) produced by a newly developed binary optics. The microstructure of the laser alloyed region is fine Fe-Cr-Si-B multi-element hypereutectic structure with hardness HRC 63 - 64. The melted layer consists of fine needle-shaped martensite and residual austenite structure with hardness HRC 58 - 61. The strengthened layer is 1.0 - 1.3 mm in thickness with pore-free and crack-free and good surface quality. Under the same condition, the Ring-block (SiN ceramic) wear test proves that the wear of the laser alloyed 45 steel ring is only 29 percent of that of induction quenching 45 steel ring. And a 500 hours test engine experiment demonstrates that the average wear of the laser alloyed cam is only 20 percent of that of induction quenched one.

Citation Download Citation

Wenjin Liu, Minlin Zhong, Haiyun Zhao, Hongjun Zhang, Weimin Zhang, and Guoqing Huang "Research on laser melting-alloying combined strengthening of the camshaft of air-cooled diesel engine", Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); https://doi.org/10.1117/12.237744

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KEYWORDS

Content addressable memory

Ceramics

Iron

Laser marking

Tolerancing

Gallium arsenide

Heat treatments

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