本文選題：3Cr13　切入點：離子滲氮　出處：《大連海事大學》2017年碩士論文

【摘要】：本文以3Cr13馬氏體不銹鋼為基體材料進行不同溫度等離子滲氮處理。論文采用金相顯微術(OPM),剝層X射線衍射(XRD)技術,掃描電子顯微術(SEM),以及X射線能譜儀(EDS)分析對滲層的組織形態(tài)、相組成以及微區(qū)化學成分進行觀察和分析。分析討論滲層相組成形成原因以及相組成沿滲層分布。論文對滲氮前后的摩擦磨損性能以及耐腐蝕性能進行了對比分析。主要研究結果如下:450℃滲氮:(1)3Cr13滲層主要由化合物層(約45μm)以及擴散層(約15μm)組成�；衔飳又饕膳蛎涶R氏體(α'N)、ε-Fe2-3N相以及少量的CrN氮化物組成。(2)沿著滲氮方向滲層相組成分布為:CrN+ε-Fe2-3N+α'N→Fe3N+α'N→α'N→α。滲層表面硬度為700HV,比基體提高2.5倍。(3)沿滲氮方向,滲層中α'N相的(110)和(200)晶面衍射峰向高角度移動,即點陣膨脹逐漸減小,且衍射峰寬化程度逐漸減弱。(4)滲后試樣耐磨性增強,耐腐蝕性能顯著增強,出現明顯的鈍化區(qū)。500°C滲氮:(1)滲氮層主要由化合物層(約60μm)以及擴散層(約40μm)組成�；衔飳又饕傻锵郈rN、Fe4N、ε-Fe2-3N以及少量的含氮馬氏體α'N組成。(2)滲氮層相分布由表及里 CrN+ε-Fe2-3N+Fe4N+α'N→ε-Fe2-3N+α'N→α'N→α。滲層表面硬度為1100HV,比基體提高4倍。(3)化合物層中含氮馬氏體α'N并未顯示出可觀測的點陣膨脹,擴散層主要由α'N組成。但擴散層中含氮馬氏體α'N出現可觀測的點陣膨脹,且(110)、(200)、(211)晶面膨脹率不同。(4)滲氮表面摩擦磨損性能有明顯的改善,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 偽 -N + Fe3N 偽 -N + -N + -N + -N + -N + -N 偽 -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 偽 -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 偽 -N) nitriding layer. The distribution of the nitriding layer is from the surface to the interior CrN 蔚 -Fe _ 2-3N Fe4N 偽 -N ~ + 蔚 -Fe _ 2-3N 偽 -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 偽 -N in the compound layer does not show an observable lattice expansion, and the diffusion layer is mainly composed of 偽 -N.However, there is observable lattice expansion of nitrogen-containing martensite 偽 -N in the diffusion layer, and the tribological and wear properties of nitrided surface are obviously improved and the wear resistance is improved.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG142.71;TG156.82

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本文編號：1724301