可控离子渗入对新型热作模具钢高温耐磨性能的影响

Effect of programmable ion permeation on high temperature wear resistance of a novel hot-working die steel

借助高温摩擦磨损试验机、X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计等研究了可控离子渗入(PIP)对新型热作模具钢显微组织及高温耐磨性的影响。结果表明,采用可控离子渗入技术处理后的新型热作模具钢试样表面形成了40μm厚的致密且均匀的渗层。最外层的Fe_(3)O_(4)相能降低试样表面的摩擦因数,次表层的Fe_(2-3)N和Fe_(4)N能显著提高基体硬度。磨损温度低于600℃时,Fe_(2-3)N和Fe_(4)N相稳定存在;磨损温度高于800℃时,Fe_(2-3)N和Fe_(4)N相转变为α-Fe相,形成含氮马氏体组织,提高了材料的抗高温磨损性能。

Effect of programmable ion permeation(PIP)on microstructure and high temperature wear resistance of a novel hot-working die steel was studied by means of high temperature wear testing machine,X-ray diffraction(XRD),scanning electron microscope(SEM)and micro-hardness testing machine.The results show that when the novel hot-working die steel is treated by PIP,a dense and complete compound layer reaching 40μm is formed.The out layer is composed of Fe_(3)O_(4) phase,which can reduce the surface friction coefficient.The subsurface layer is composed of Fe_(2-3)N and Fe_(4)N phases,which can improve the surface hardness.When the wear test temperature is lower than 600℃,Fe_(2-3)N and Fe_(4)N phases exist stably.When the wear test temperature is higher than 800℃,Fe_(2-3)N and Fe_(4)N phases transform intoα-Fe phase to form a nitrogen-containing martensite structure,which improves the high temperature wear resistance of the material.