激光加工对金属成形用工具钢扩散渗硼层组织和性能的影响

A. Bartkowska, P. Jurči, M. Hudáková, D. Bartkowski, D. Przestacki, M. Kusý, M. Kuřík
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引用次数: 0

摘要

本文介绍了钒6工具钢经扩散渗硼和激光加工后的显微组织、相组成、显微硬度和耐磨性的研究结果。本研究采用了二极管激光器件。扩散渗硼后得到的表层具有针状组织,与基体结合良好,但在次表层存在分层和孔隙现象。因此,采用激光热处理对扩散渗硼层进行了加工。由于激光束的影响,得到了三个区域。观察到靠近表面的重熔区,其次是热影响区,最后是钢基体。在重熔区新形成的组织由硼-马氏体共晶组成。激光处理后的渗硼层显微硬度略低于未经激光处理的渗硼层显微硬度。从1300 HV0.1到1100 HV0.1。发现激光加工渗硼层的另一个优点是热影响区的存在。这导致在表面和衬底之间获得温和的显微硬度梯度。激光处理后的渗硼层与未经激光处理的渗硼层相比,具有更高的耐磨性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
THE INFLUENCE OF LASER PROCESSING ON MICROSTRUCTURE AND SELECTED PROPERTIES OF THE DIFFUSION BORONIZED LAYERS PRODUCED ON TOOL STEEL FOR METAL FORMING
The paper presents the study results of microstructure, phase composition, microhardness and wear resistance of Vanadis-6 tool steel after diffusion boriding and laser processing. In this study the diode laser device was used. As a result of diffusion boriding the obtained surface layers were characterized by needlelike microstructure with good cohesion with the substrate but in the subsurface area delamination and porosity could be observed. Therefore the diffusion boronized layer was processed using laser heat treatment. As a result of influence of the laser beam, three zones were obtained. The remelted zone near the surface, next the heat affected zone and finally steel substrate were observed. The newly created microstructure in the remelted zone consisted of boron-martensite eutectic. Microhardness of boronized layer after laser processing in comparison to the one without laser processing was slightly lower and was approx. from 1300 HV0.1 to 1100 HV0.1. It was found that additional advantage of laser processing of boronized layers was the presence of heat affected zone. This led to obtaining a mild microhardness gradient between the surface and the substrate. The boronized layer after laser processing was characterized by higher wear resistance in comparison to one not subjected to this kind of processing.
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