Study on the substrate ablation behaviour of Cr-plated barrel treated by laser discrete pre-quenching
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1.
Department of Mechanical & Electrical Engineering, Jianghai Polytechanic College, Yangzhou 225101, China;
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2.
College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
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Received Date:
2012-05-09
Accepted Date:
2012-07-25
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Abstract
To reveal the mechanism that laser discrete pre-quenching substrate could increase the lifetime of a certain model chromium-plated gun barrel, the substrate behavior between laser treated and untreated the end Cr-plating barrel were compared in experiments. The results show that there is no obvious ablation pits in the gun barrel; the ablation value of laser-treated gun barrel is decreased by 10% than that of untreated one, which is because the main-cracks of Cr-coating with larger distance between a main crack and nearby other Cr-coating are propagated to the ablation layer, the distance of main crack affecting ablation layer spallation is increased, and then the spallation time of ablation layer is delayed. The result is helpful to further analysis of laser discrete pre-processing substrate to improve service life of chromium plated gun barrels.
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