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Effect of Laser Hardening and Gas Nitriding on Wear Resistance of Steel P20: A Comparative Study
Guanghua Yan1, Xudong Yang2, Jianfeng Gu2, Chuanwei Li2
1 School of Construction Machinery, Shandong Jiao Tong Univer sity, Jinan, China.
2 Institute of Materials Modification and Modeling, School of Ma terials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.
Abstract:
The effect of laser hardening and of gas nitriding on the microstructure and wear resistance of steel P20 (the Russian counterpart is 38KhNM) is studied. The phase composition and the microhardness of the hardened surface layers are determined and their microstructure is studied. Wear tests are performed. It is shown that both treatments raise the hardness of the steel. However, the nitrided layer has a higher resistance to plastic de formation, a higher indentation modulus, and a much higher wear resistance than the laser hardened layer. La ser hardening produces a deeper hardened layer, whereas gas nitriding provides a higher wear resistance of steel P20
Effect of Laser Hardening and Gas Nitriding on Wear Resistance of Steel P20: A Comparative Study.pdf
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