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Heat treatment of nitrided layer formed on X37CrMoV5-1 hot working tool steel

机译：在X37Crmov5-1热加工工具钢上形成氮化层的热处理

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The paper presents the technology consisting of combination of the nitriding process with subsequent austenitizing at temperature above eutectoid temperature of the Fe-C system and further rapid cooling. Such treatment will cause formation of the martensite in the area of the primarily nitrided layer and the additional precipitation hardening by tempering of heat treated steel. The article shows that the heat treatment process of nitrided layer formed on X37CrMoV5-1 steel leads to strengthening of surface layer, the substrate and the core of nitrided part. Heat treatment of nitrided steel with the tempering in inert (nitrogen) or active (ammonia) atmosphere can increase the thickness of the layer formed by short-term nitriding process. After the nitriding process of X37CrMoV5-1 steel the nitrided layer had a thickness of about 160 μm, while a subsurface layer of iron nitrides had a thickness of 7 μm. After subsequent quenching and tempering processes, the nitrided layer undergoes additional diffusion and its thickness is increased to about 220 μm (inert atmosphere) or 280 μm (active atmosphere). If the tempering process is carried out in an inert atmosphere, the primarily formed layer of iron nitrides disappears. Tempering in an active atmosphere leads to forming of white layer with a thickness of 7 μm. Basic properties of nitrided layers formed in such way, like the hardness and the wear resistance, are presented.
机译：本文介绍了在温度高于所述的Fe-C系统的共析温度并进一步快速冷却由具有奥氏体化之后氮化处理相结合的技术。这种治疗将通过热处理钢的回火造成形成在主要氮化层和附加的沉淀硬化的区域中的马氏体的。该文章表明，形成在X37CrMoV5-1钢引线加强表面层，衬底和氮化部件的芯的氮化层的热处理工艺。热处理在惰性（氮气）回火氮化钢或活性（氨）的气氛可以增加短期氮化处理形成的层的厚度。 X37CrMoV5-1钢的氮化处理后的氮化层的厚度为约160微米，而氮化铁的地下层的厚度为7μm。随后的淬火，回火处理之后，氮化层进行额外的扩散，并且其厚度增加至约220微米（在惰性气氛）或280微米（活性气氛）。如果回火过程是在惰性气氛中进行，氮化铁的主要形成层消失。回火中的活性气氛导致的厚度为7μm的白色层的形成。形成在这样的方式氮化层的基本特性，如硬度和耐磨损性，呈现。

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