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针对PCrMo钢在火炮上应用较多但因零部件磨损失效造成系统故障不断的问题,利用现有摩擦磨损微观分析方法和技术,对在火炮射击及训练等特殊工况下,零部件磨损失效机理及规律进行研究.以挡弹装置中的挡弹板轴为研究对象,利用显微硬度计及扫描电镜对零件表面和剖面进行硬度测量与结构组织微观分析,结果表明零件表面磨损区域硬度明显高于未磨损区域,且磨损区域表层剖面硬度增大;依据表面形貌可将磨损区域划分为以剥落为主的初始磨损区、以切削为主的中间磨损区和磨损较轻的末端磨损区.零件磨损失效机理为以冲击滑动耦合磨损和磨粒磨损为主的磨损机制造成表面材料的损失累积与加工硬化.
Aiming at the problem of PCrMo steel applying more on artillery but causing system failure due to wear and tear of parts, the existing friction and wear microscopic analysis methods and techniques are used to analyze the wear failure mechanism of PCrMo steel under special conditions such as gun firing and training And the law of the research.With the shield arm of the baffle device as the research object, the microhardness tester and scanning electron microscope were used to measure the hardness and microstructure of the part surface and section, the results show that the part surface wear area hardness is obviously high In the unworn area, the surface section hardness of the worn area increases. According to the surface topography, the worn area can be divided into the initial wear area which is mainly peeled off, the middle wear area which is mainly cut, and the end wear area which is less worn. Part wear failure mechanism for the impact of sliding coupling wear and abrasive wear-based wear mechanism caused by the loss of surface material accumulation and hardening process.