为了揭示激光离散预处理基体提高某种型号镀铬身管寿命的机理,采用实验方法,对激光离散处理和未处理的寿终镀铬身管基体烧蚀行为进行了定量对比分析,发现经激光离散处理的没有明显烧蚀沟,并且其基体的烧蚀量比激光未处理的降低了10％.结果表明,降低的原因是受激光处理控制的间距较大的铬层主裂纹扩展到了烧蚀层,增加了影响烧蚀层剥落的主裂纹间距,延缓了烧蚀层的剥落时间.这一结果对进一步分析激光离散预处理基体提高镀铬身管寿命是有帮助的.%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.
展开▼
