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本文对超高强度18Ni马氏体时效钢离子氮化前后的尺寸稳定性和渗层进行了研究。预时效和氮化工艺选择恰当使氮化前后有高度的尺寸稳定性。通过金相,X光相分析,俄歇谱仪,扫描电镜和透射电镜等,研究了渗层的组织、结构及相成分。采用了单侧减薄的制膜技术,观察了化合物的精细结构。18Ni马氏体时效钢经离子氮化后,表面硬度可达HRC62以上,渗层深度大于0.2mm,扩散层内除有分布均匀的氮化物外,还有细而密的Ni_3Mo存在,表面化合物层是由晶粒细小,且有一定方向性的γ′相组成。
In this paper, the dimensional stability and the infiltration of ultra-high strength 18Ni martensitic steel before and after nitriding were studied. The pre-aging and nitriding processes are properly selected to provide a high degree of dimensional stability before and after nitriding. The microstructure, structure and phase composition of the layer were studied by metallography, X-ray photoelectron spectroscopy, Auger spectroscopy, scanning electron microscopy and transmission electron microscopy. Film unilateral thinning technology was used to observe the fine structure of the compound. 18Ni martensitic steel after nitriding, the surface hardness of up to HRC62 above, the depth of the infiltration layer is greater than 0.2mm, in addition to diffusion layer of uniform nitride, there are thin and dense Ni_3Mo existence of the surface compound layer Is composed of small grains, and a certain direction of γ ’phase composition.