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表面热处理是提高模具质量和使用寿命的有效途径之一。鉴于渗硼所带来的高硬度、高耐磨性和高红硬性,模具渗硼日益受到重视和广泛应用,但渗硼层的脆性问题目前仍是一个限制因素。渗硼工件的这些性能特点,都与渗硼后的组织结构有关,而渗硼组织结构又取决于所采用的材料和工艺条件(包括渗硼工艺及随后的热处理工艺)。为了解决热锻模渗硼工艺的实际应用问题,必须对热锻模具钢的渗硼组织结构进行研究。本文通过光学金相和扫描电镜的组织观察、电子探针和X射线衍射分析,以及显微硬度的测定等来分析研究5CrNiMo钢试样的渗硼组织结构。
Surface heat treatment is to improve the quality and service life of one of the effective ways. In view of the high hardness, high wear resistance and high red hardness brought by boronizing, the boronizing of mold is paid more and more attention and widely used, but the brittleness of boronizing layer is still a limiting factor. These properties of boronizing workpieces are all related to the structure of the steel after boronizing, which, in turn, depends on the material and process conditions used (including the boronization process and the subsequent heat treatment process). In order to solve the practical application of hot forging boronizing process, we must study the hot-forged steel boron structure. In this paper, the microstructure of 5CrNiMo steel samples was analyzed by microstructure observation of optical metallography and scanning electron microscopy, electron probe and X-ray diffraction analysis, and the determination of microhardness.