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首页> 外文期刊>ISIJ international >Nitrogen Supersaturation Process in the AISI420 Martensitic Stainless Steels by Low Temperature Plasma Nitriding
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Nitrogen Supersaturation Process in the AISI420 Martensitic Stainless Steels by Low Temperature Plasma Nitriding

机译：低温等离子体氮化在AISI420马氏体不锈钢中的氮过饱和过程

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摘要

A high-density RF-DC plasma nitriding system was employed on AISI420-J2 martensitic stainless steel at 653 K, 673 K, and 693 K for 14.4 ks. Scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD), and electron backscattered diffraction (EBSD) were utilized to make analysis and characterization of the nitrided layers. These layers with the thickness of 85 μ m from the surface was mainly nitrogen super-saturated with formation of nitrides at the vicinity of surface. The nitrogen content depth profile was nearly constant by 10 at% except for the gradual decrease from the maximum content by 30 at% at the surface and for the decay toward the nitriding front end. The lattice expansion by the strain of 1.6% drove the phase transformation from the original martensite to austenite. High plastic straining following this elastic lattice expansion also caused the grain size refinement from the original size of 10 μ m down to 0.15 μ m.
机译：在AISI420-J2马氏体不锈钢上以653 K，673 K和693 K的高密度RF-DC等离子体氮化系统处理了14.4 ks。利用扫描电子显微镜（SEM），能量色散谱（EDS），X射线衍射（XRD）和电子背散射衍射（EBSD）对氮化层进行分析和表征。这些从表面开始的厚度为85μm的层主要是氮超饱和的，并且在表面附近形成了氮化物。氮含量深度分布几乎恒定为10 at％，除了从表面的最大含量逐渐减少30 at％以及向氮化前端衰减为止。 1.6％应变引起的晶格膨胀驱动了从原始马氏体到奥氏体的相变。在该弹性晶格膨胀之后的高塑性应变也引起晶粒尺寸的细化，从原来的10μm减小到0.15μm。

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