Degradation failure features of chromium-plated gun barrels with a laser-discrete-quenched substrate

SURFACE & COATINGS TECHNOLOGY

卷:201

Article

Li, Huaixue ; Chen, Guangnan ; Zhang, Kun ; Luo, Gengxing ; Ye, Zhijun

关键词: gun bore;    electrodeposited chromium;    interface;    laser-discrete quenching;   

DOI  :  10.1016/j.surfcoat.2007.04.034

来源: Elsevier

【 摘 要 】

The effect of substrate laser-discrete quenching on the degradation failure of chromium-plated gun barrels was metallurgically investigated. The results show that substrate laser-discrete quenching changes the failure patterns of chromium coatings during firing, and some periodic through-thickness cracks in the fired chromium coatings are justly located at original substrate zones between two adjacent laser-quenched tracks. Moreover, chromium coatings and the laser-quenched zones on the substrate are simultaneously degraded in microstructure and property during firing. Furthermore, the periodic structure of the laser-discrete-quenched steel (LDQS) substrate near the breech remains after firing, and the hardness of the fired laser-quenched zones is still higher than that of original substrates. The specific failure features were utilized to illustrate the mechanism of the extended service life of chromium-plated gun barrels with the LDQS substrate. (c) 2007 Elsevier B.V All rights reserved.

【 授权许可】

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