三种常用耐磨钢的摩擦学性能研究

发布时间：2018-03-20 11:00

本文选题：中锰钢　切入点：高锰钢　出处：《中国矿业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文对中锰钢、高锰钢(Mn13)以及马氏体耐磨钢(HD400)三种耐磨钢进行了不同载荷下的滑动磨损试验、两体磨料磨损试验、三体磨料磨损试验以及不同冲击功下的冲击磨料磨损试验。对其耐磨性能进行了系统的评价,并对其力学性能、表面磨损形貌进行了实验研究,建立了磨料对试样表面破坏机理影响的模型;最后对中锰钢、高锰钢(Mn13)的加工硬化机理进行了分析。中锰钢在硬质磨料磨损条件下耐磨性较好,而HD400在软质磨料条件下耐磨性较好,而中锰钢和Mn13在干摩擦滑动磨损条件下的耐磨性好于HD400。在冲击磨料磨损试验中,HD400在冲击功较高时耐磨性较好,其与Mn13在低冲击功下耐磨性较差,而中锰钢在所有冲击条件下都具有较好的耐磨性能。三种耐磨钢在不同磨损条件下,其磨损机理不同。而且在添加磨料的滑动磨损与两体磨料磨损试验中,磨料运动方式对试样表面的破坏机制有重要影响。在滑动磨损试验中,当磨料在上下试样之间滑动时,磨料对试样表面造成犁沟;而当磨料在上下试样之间滚动时,磨料对试样表面造成凿坑与切削。在两体磨料磨损试验中,当磨料垂直于试样表面运动时,磨料对试样表面造成凿削坑,而当磨料平行于试样表面运动时,对试样表面造成犁沟。中锰钢的加工硬化性能优于Mn13,尤其是在低载荷以及低冲击功条件下。在冲击磨料磨损试验中,中锰钢在1J冲击功下磨损表面加工硬化机理主要为体心立方马氏体相变,并且有高密度位错。当冲击功升高至4J时,中锰钢磨损表面马氏体转变量增加。Mn13在1J冲击功下磨损表面加工硬化机理为高密度位错、孪晶以及密排六方结构的层错,其在4J冲击功下磨损表面加工硬化机理为体心立方马氏体相变,且位错密度增大,位错相互缠结为位错胞与位错岛。
[Abstract]:In this paper, three kinds of wear-resistant steels, medium manganese steel, high-manganese steel and martensite wear-resistant steel, are tested by sliding wear and two-body abrasive wear under different loads. The three-body abrasive wear test and the impact abrasive wear test under different impact work were carried out. The wear resistance was systematically evaluated, and the mechanical properties and surface wear morphology were studied experimentally. A model of the influence of abrasives on the surface failure mechanism of specimens was established. Finally, the work hardening mechanism of medium manganese steel and high manganese steel was analyzed. The wear resistance of medium manganese steel was better under the condition of hard abrasive wear. The wear resistance of HD400 is better than that of HD400 under soft abrasive condition, while that of medium manganese steel and Mn13 is better than that of HD400 under dry friction and sliding wear. The wear resistance of medium manganese steel is lower than that of Mn13 under low impact power, while medium manganese steel has better wear resistance under all impact conditions. The wear mechanism is different. In the sliding wear test of adding abrasive and two-body abrasive wear, the mode of abrasive movement has an important effect on the failure mechanism of the specimen surface. In the sliding wear test, when the abrasive slips between the upper and lower samples, The abrasive creates a plough on the surface of the specimen, and when the abrasive is rolling between the upper and lower samples, the abrasive causes chiseling and cutting on the surface of the specimen. In the two-body abrasive wear test, when the abrasive moves perpendicular to the surface of the specimen, The abrasive causes a chisel hole on the surface of the specimen, and when the abrasive moves parallel to the surface of the specimen, The working-hardening property of medium manganese steel is better than that of Mn13, especially under the condition of low load and low impact power. The machanism of wear surface work hardening of medium manganese steel under 1J impact work is mainly body-centered cubic martensitic transformation with high density dislocation. When the impact energy rises to 4J, the wear surface hardening mechanism is mainly body-centered cubic martensitic transformation. When the martensite transformation amount on the worn surface of medium manganese steel is increased. Mn13 is machined by high density dislocation, twin and stacking fault of dense hexagonal structure at 1J impact work. The work-hardening mechanism of the worn surface at 4J impact work is a body-centered cubic martensitic transformation, and the dislocation density increases, and the dislocation intertwined into dislocation cell and dislocation island.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG142.12

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