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本文用X射线衍射法研究了高速钢激光相变硬化层组织,以及激光工艺参数和原始组织对残余奥氏体含量的影响;并对激光相变硬化机理进行了分析。结果表明,激光相变硬化层组织由马氏体、残余奥氏体和合金碳化物组成。随着激光功率增加,扫描速度降低,残余奥氏体含量增加。激光相变硬化的本质仍然是马氏体相变。同时,晶粒细化强化,碳化物弥散强化以及激光淬火前的原始组织中的强化因素的遗传性等多种强化因素对超高硬度的获得也有贡献。
In this paper, X-ray diffraction method was used to study the microstructure of high-speed steel laser phase-change hardened layer, as well as the influence of laser process parameters and original microstructure on retained austenite content. The mechanism of laser phase transformation hardening was also analyzed. The results show that the laser phase-change hardened layer consists of martensite, retained austenite and alloy carbides. As the laser power increases, the scanning speed decreases and the retained austenite content increases. The essence of laser phase transformation hardening is still martensitic transformation. At the same time, various strengthening factors such as grain refinement strengthening, carbide dispersion strengthening, and inheritance of strengthening factors in the original structure before laser quenching contribute to the achievement of ultra-high hardness.