3Cr13马氏体不锈钢等离子渗氮层组织及性能研究

发布时间：2018-04-09 01:39

本文选题：3Cr13　切入点：离子渗氮　出处：《大连海事大学》2017年硕士论文

【摘要】：本文以3Cr13马氏体不锈钢为基体材料进行不同温度等离子渗氮处理。论文采用金相显微术(OPM),剥层X射线衍射(XRD)技术,扫描电子显微术(SEM),以及X射线能谱仪(EDS)分析对渗层的组织形态、相组成以及微区化学成分进行观察和分析。分析讨论渗层相组成形成原因以及相组成沿渗层分布。论文对渗氮前后的摩擦磨损性能以及耐腐蚀性能进行了对比分析。主要研究结果如下:450℃渗氮:(1)3Cr13渗层主要由化合物层(约45μm)以及扩散层(约15μm)组成。化合物层主要由膨胀马氏体(α'N)、ε-Fe2-3N相以及少量的CrN氮化物组成。(2)沿着渗氮方向渗层相组成分布为:CrN+ε-Fe2-3N+α'N→Fe3N+α'N→α'N→α。渗层表面硬度为700HV,比基体提高2.5倍。(3)沿渗氮方向,渗层中α'N相的(110)和(200)晶面衍射峰向高角度移动,即点阵膨胀逐渐减小,且衍射峰宽化程度逐渐减弱。(4)渗后试样耐磨性增强,耐腐蚀性能显著增强,出现明显的钝化区。500°C渗氮:(1)渗氮层主要由化合物层(约60μm)以及扩散层(约40μm)组成。化合物层主要由氮化物相CrN、Fe4N、ε-Fe2-3N以及少量的含氮马氏体α'N组成。(2)渗氮层相分布由表及里 CrN+ε-Fe2-3N+Fe4N+α'N→ε-Fe2-3N+α'N→α'N→α。渗层表面硬度为1100HV,比基体提高4倍。(3)化合物层中含氮马氏体α'N并未显示出可观测的点阵膨胀,扩散层主要由α'N组成。但扩散层中含氮马氏体α'N出现可观测的点阵膨胀,且(110)、(200)、(211)晶面膨胀率不同。(4)渗氮表面摩擦磨损性能有明显的改善,耐磨性能提高。
[Abstract]:Plasma nitriding at different temperatures was carried out on 3Cr13 martensitic stainless steel.In this paper, the microstructure, phase composition and chemical composition of the permeable layer were observed and analyzed by means of metallographic microscopy (OPM), exfoliated X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray energy spectrometer (EDS).The formation reason of the phase composition and the distribution of the phase composition along the permeation layer are analyzed and discussed.The friction and wear properties and corrosion resistance before and after nitriding were compared and analyzed in this paper.The main results are as follows: (1) the nitriding layer consists of compound layer (about 45 渭 m) and diffusion layer (about 15 渭 m).The compound layer is mainly composed of expanded martensite (蔚 -Fe2-3N phase, 蔚 -Fe2-3N phase and a small amount of CrN nitride composition. 2) along the nitriding direction of nitriding. The composition of the layer is distributed as: CRN 蔚 -Fe2-3N 伪 -N + Fe3N 伪 -N + -N + -N + -N + -N + -N 伪 -N ~ (2 +).The surface hardness of the infiltrating layer is 700 HVV, which is 2.5 times higher than that of the matrix. Along the direction of nitriding, the diffraction peak of 伪 -N phase moves to a high angle, that is, the lattice expansion decreases gradually, and the diffraction peak width decreases gradually.The corrosion resistance of the nitriding layer is obviously enhanced, and the nitriding layer is mainly composed of compound layer (about 60 渭 m) and diffusion layer (about 40 渭 m).The compound layer is mainly composed of the nitride phase CrN- Fe _ 4N, 蔚 -Fe _ 2-3N and a small amount of nitrogenous martensite 伪 -N) nitriding layer. The distribution of the nitriding layer is from the surface to the interior CrN 蔚 -Fe _ 2-3N Fe4N 伪 -N ~ + 蔚 -Fe _ 2-3N 伪 -N ~ (+) -N ~ (+) -N ~ (+) ~ (-)The surface hardness of the infiltrating layer is 1100HV, which is 4 times higher than that of the matrix.) the nitrogen-containing martensite 伪 -N in the compound layer does not show an observable lattice expansion, and the diffusion layer is mainly composed of 伪 -N.However, there is observable lattice expansion of nitrogen-containing martensite 伪 -N in the diffusion layer, and the tribological and wear properties of nitrided surface are obviously improved and the wear resistance is improved.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG142.71;TG156.82

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