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本文以60D钢制齿轮为试件,探讨了感应加热淬火时不同冷却方式对残余应力、淬火组织中马氏体形态和齿轮使用性能的影响。研究了经两种淬火冷却方式后齿轮的硬度、硬化层分布和表层残余应力,用光学显微镜和透射电镜对淬火组织进行了观察分析。试验结果表明,经感应加热喷水激冷淬火的齿轮,齿面残余压应力高于流水淬火的。其淬火组织全部为含位错的无孪晶板条马氏体,因而齿轮台架试验使用寿命较长。本文还初步分析讨论了板条马氏体和片状马氏体对强韧性的影响。指出具有快速加热急剧冷却工艺特征的感应淬火是使中高碳钢强韧化的途径之一。
In this paper, the effects of different cooling modes on residual stress, martensite morphology and gear performance in quenched microstructure were investigated with 60D steel gear. The hardness, hardened layer distribution and superficial residual stress of the gear after two kinds of quenching and cooling methods were studied. The microstructure of the quenched structure was observed by optical microscope and transmission electron microscope. The test results show that the residual compressive stress on the gear tooth surface is higher than that of the quenched gear by inductively heat-sprayed quench gear. All of its quenched structure without dislocation without twins martensitic lath, and thus gear bench test longer service life. In this paper, the effects of lath martensite and lamellar martensite on the toughness were also analyzed. It is pointed out that induction quenching, which has the characteristics of rapid heating and rapid cooling process, is one of the ways to strengthen and toughen the medium and high carbon steels.