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| Performance Test of Chromium Plating in Body Bore |
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| DOI：10.7643/issn.1672-9242.2022.07.003 |
| KeyWord:gun barrel life chromium plating strengthened layer ablation wear performance test |
| Author | Institution |
| ZHANG Fan-fan |
Northwest Institute of Mechanical & Electrical Engineering, Shaani Xianyang , China |
| ZHANG Li-feng |
Norinco Group Inner Mongolia North Heavy Industries Group Co., Ltd., Inner Mongolia Baotou , China |
| LI Ou |
Norinco Group Inner Mongolia North Heavy Industries Group Co., Ltd., Inner Mongolia Baotou , China |
| WANG Wei |
Norinco Group Inner Mongolia North Heavy Industries Group Co., Ltd., Inner Mongolia Baotou , China |
| YANG Diao |
Northwest Institute of Mechanical & Electrical Engineering, Shaani Xianyang , China |
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| Abstract: |
| 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. |
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