身管内膛镀铬性能检测研究

目的对内膛表面强化层性能进行定量评估,给后续镀铬层的优化及新型内膛表面强化层技术的优选提供试验方法。方法以成熟度最高、应用最广泛的内膛表面镀铬技术为依据,开展强化层检测研究,主要包括硬度、厚度及微观缺陷、结合性能、抗烧蚀性能、抗磨损性能等研究。量化镀铬层抗烧蚀、抗磨损性能,实现实验室对内膛镀铬层性能的综合评估。结果铬层硬度约为521.8HV,高于基体硬度。铬层裂纹初始宽度约为300 nm,多数裂纹未连接成“网状”。铬层与基体结合力约为67.2 N。相同条件下,相比基体,镀铬层的烧蚀量和磨损量始终较小。结论镀铬层综合性能优于基体材料。

Performance Test of Chromium Plating in Body Bore

When an artillery is in lunch process, the barrel is subjected to the coupling effects of various strong loads, resulting in ablative wear of the inner bore until the end of its life. Inner bore surface strengthening is the most direct and effective measure to improve the lifetime of the body tube. The purpose of this paper is to quantitatively evaluate the performance of the reinforcing layer and to provide a test method for the optimization of the chromium coating and the new inner bore surface strengthening technology. Based on the highest maturity and the most widely used technology-chrome plating on inner bore surface, the performance of strengthening layer is tested and studied, including hardness, thickness and micro defects, bonding performance, anti-ablative performance, anti-wear performance and so on. The anti-ablative and anti-wear properties of the chromium coating are quantified, which realized the comprehensive evaluation of the chromium coating performance in the laboratory. The hardness of chromium coating is about 521.8HV, which is higher than that of substrate. The initial crack width of the chromium coating is about 300 nm, and most cracks are not connected into a network. The adhesion between chromium coating and substrate is about 67.2 N. Under the same conditions, the ablation and wear of the chromium coating are always smaller than that of the substrate. The comprehensive performance of chromium coating is better than that of the substrate.