Study of laser nitriding on the GCR15 steel surface

Pulse laser nitriding of GCr15 steel in the surrounding of NH3 gas was studied. The experimental results show that a high hardness, good wear resistance, compact and uniformity hard layer of iron nitride was obtained. The results of micro-hardness and wear rate testing shows that after laser nitridi...

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Bibliographic Details
Published in:Physics procedia 2011, Vol.18, p.285-290
Main Authors: Gan, WU, Rui, WANG, Jang-ping, YANG, Xue-kang, CHEN, Sheng-zhu, CAO, Wan-tu, GUO, kai-wen, SHANG, Bo, Wei, Xiao-yi, Wang, Lan-xi, Wang
Format: Article
Language:English
Subjects:
GCr15
laser nitriding
mechanism of laser nitriding
micro-hardness
pulse laser
wear rate
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Summary:Pulse laser nitriding of GCr15 steel in the surrounding of NH3 gas was studied. The experimental results show that a high hardness, good wear resistance, compact and uniformity hard layer of iron nitride was obtained. The results of micro-hardness and wear rate testing shows that after laser nitriding, the micro-hardness of the sample increased 18 percent and wear rate of the sample decreased 50 percent, laser nitriding improves the sample's wear resistance character. The nitriding layer is about 150μm thick and contains nitrided iron dendrites. The microstructure, phase constitution, micro-hardness, depth and wear character of the nitriding layer were determined and analyzed, and the pulsed laser nitride mechanism on the surface of GCr15 steel was discussed.
ISSN:1875-3892
1875-3892
DOI:10.1016/j.phpro.2011.06.096