模具表面改性渗层组织性能研究

Research on Microstructure and Property of Surface Modification Permeating Layers of Die Steels

从模具钢、热加工工艺与表面处理组织性能的相互关系出发,选用5种材料,分别进行QPQ盐浴氮化和TD法盐浴渗钒,借助Olympus CMM55Z光学金相显微镜和宝棱显微硬度计等设备,研究材料渗层组织性能和显微硬度分布梯度,分析探讨模具的使用性能。结果表明:盐浴氮化中,Cr12MoV的耐磨性和抗冲击性能最突出,45Cr4Ni MoV的韧塑性和抗冲击性能优于W18Cr4V,42Cr Mo的综合性能最弱;盐浴渗钒中,160CrNi Mo覆层厚13μm,远高于其他试验材料,但中碳合金钢覆层效果不佳,为兼顾模具耐磨性、韧塑性和抗冲击性,宜选用中碳合金钢而非高碳合金钢进行渗碳、TD处理和后续热处理,这对提高模具使用寿命有重要价值。

This paper deals with QPQ salt nitriding and Toyota Diffusion vanadium carbide c oating individually with 5 kinds of die steels. The microstructure and property of permeating layers and the gradient curve of microhardness distribution were i nvestigated by means of Olympus optical microscope, Hitachi SEM, and Baoling mic rohardness apparatus etc. The performance of dies was also discussed combined with their characteristics of surface modifications. Results have shown that, by n itriding, Cr12MoV permeating...