06Cr19Ni10表面氩弧熔覆CoCrFeMnNi系高熵合金涂层研究

发布时间：2018-03-30 11:09

本文选题：高熵合金　切入点：氩弧熔覆　出处：《辽宁工程技术大学》2015年硕士论文

【摘要】：被广泛关注的高熵合金突破了传统合金设计理论的桎梏,以其简单的结构、优异的性能被众多研究者看作是极具应用潜力的表面熔覆材料。本文采用氩弧熔覆的方法,在06Cr19Ni10不锈钢表面制备CoCrFeMnNi系高熵合金熔覆涂层。计算该体系各高熵合金的原子半径差参数、混合焓与混合熵,并综合二因素、三因素对各高熵合金的相形成进行定性预测。采用X射线衍射仪、扫描电镜、能谱仪、显微硬度计等设备分别对CoCrFeMnNbxNi、 CoCrFeMnMoxNi、CoCrFeMnNiWx (x=0.5,1.0,1.5,2.0;摩尔比)高熵合金涂层的组织结构、微区成分、显微硬度进行系统研究,并对其耐磨性、耐蚀性进行探讨。研究表明：经二因素,三因素计算,CoCrFeMnNbxNi、CoCrFeMnMoxNi、CoCrFeMnNiWx(x=0.5, 1.0,1.5,2.0)三个体系的高熵合金全部符合固溶体型高熵合金的范围。CoCrFeMnNbxNi高熵合金涂层主要由FCC固溶体与Laves相构成。CoCrFeMnNbNi、 CoCrFeMnNb1.5Ni高熵合金涂层中片层状团簇组织的片层间距可达纳米级别,后者有纳米级别的颗粒组织析出。硬度最高的CoCrFeMnNb2Ni高熵合金涂层的平均显微硬度可达700HV0.2以上。该体系所有高熵合金涂层的耐磨性均优于06Cr19Ni10的,CoCrFeMnNb2Ni高熵合金涂层耐磨性最佳。在质量分数为3.5%的NaCl溶液中,该体系所有高熵合金涂层的耐蚀性均优于06Cr19Ni10的。耐蚀性最佳的CoCrFeMnNb1.5Ni高熵合金涂层的自腐蚀电流密度比06Cr19Ni10、一个数量级。CoCrFeMnMoxNi高熵合金涂层主要由FCC固溶体与Rhombohedral固溶体构成。CoCrFeMnMoNi高熵合金涂层的片层状团簇组织的片层间距为亚微米级别至纳米级别。CoCrFeMnMo1.5Ni高熵合金涂层最精细区域组织的片层间距可达120nm左右。CoCrFeMnMo2Ni高熵合金涂层中有纳米组织析出。硬度最高的CoCrFeMnMo2Ni高熵合金涂层的平均显微硬度可达700 HV0.2以上。该体系所有高熵合金涂层的耐磨性均优于06Crl9Ni10的,CoCrFeMnMoNi、CoCrFeMnMo2Ni高熵合金涂层均具有较佳的耐磨性,CoCrFeMnMo2Ni高熵合金涂层耐磨性最佳。在质量分数为3.5%的NaCl溶液中,该体系所有高熵合金涂层的耐蚀性均优于06Cr19Ni10的。CoCrFeMnMo1.5Ni、CoCrFeMnMo2Ni高熵合金涂层的自腐蚀电流密度均比06Cr19Ni10小一个数量级,后者可以在介质中钝化。CoCrFeMnNiWx高熵合金涂层主要由FCC固溶体、η相与M23C6构成。CoCrFeMnNi W、 CoCrFeMnNiW1.5高熵合金涂层中η相、M23C6分别与FCC固溶体形成两种鱼骨状共晶体,但后者的显微组织更加精细,CoCrFeMnNiW2高熵合金涂层中粗大化的η相单独析出。硬度最高的CoCrFeMnNiW1.5、CoCrFeMnNiW2高熵合金涂层的平均显微硬度均在700 HV0.2以上。该体系所有高熵合金涂层的耐磨性均优于06Cr19Ni10的,CoCrFeMnNiW、 CoCrFeMnNiW1.5、CoCrFeMnNiW2高熵合金涂层均具有优异的耐磨性,CoCrFeMnNiW2高熵合金涂层耐磨性最佳。在质量分数为3.5%的NaCl溶液中,除CoCrFeMnNiW高熵合金涂层外,该体系其它涂层的自腐蚀电流密度与06Cr19Ni10均在同一数量级上。
[Abstract]:The high entropy alloy, which has been widely concerned, has broken through the shackles of the traditional alloy design theory. With its simple structure and excellent properties, it is regarded by many researchers as a surface cladding material with great potential for application. In this paper, argon arc cladding method is used. CoCrFeMnNi system high entropy alloy cladding coating was prepared on the surface of 06Cr19Ni10 stainless steel. The atomic radius difference parameters, mixing enthalpy and mixing entropy of each high entropy alloy in the system were calculated, and two factors were synthesized. Three factors were used to predict the phase formation of high entropy alloys qualitatively. The microstructure and microstructures of CoCrFeMnNbxNix CoCrFeMnMoxNix CoCrFeMnNix 0.5NWx CoCrFeMnNix and CoCrFeMnNiWx (1.52.0mol) high entropy alloy coatings were determined by X-ray diffractometer, scanning electron microscope, energy spectrometer and microhardness tester respectively. The microstructure and microstructures of CoCrFeMnNbxNix, CoCrFeMnMoxNixNix and CoCrFeMnNixNix were determined. The microhardness was studied systematically, and the wear resistance and corrosion resistance were discussed. Three-factor calculation of CoCrFeMnNbxNiC0CrFeMnMoxNiCoCrFeMnMoxNiCoCrFeMnNiWxHX 0.5, 1.0 ~ 1.52.0) the high entropy alloy all accord with the range of solid solution-type high entropy alloy. CoCrFeMnNbxNi high entropy alloy coating is mainly composed of FCC solid solution and Laves phase. CoCrFeMnNbNi. the interlaminar structure of lamellar clusters in CoCrFeMnNb1.5Ni high entropy alloy coating. Up to the nanoscale level, The average microhardness of the CoCrFeMnNb2Ni high entropy alloy coating with the highest hardness is over 700HV0.2. The wear resistance of all high entropy alloy coatings in this system is better than that of the CoCrFeMnNb2Ni high entropy alloy coating with 06Cr19Ni10. In 3.5% NaCl solution, The corrosion resistance of all high entropy alloy coatings in this system is better than that of 06Cr19Ni10. The self-corrosion current density ratio of CoCrFeMnNb1.5Ni high entropy alloy coating with the best corrosion resistance is 06Cr19Ni10. An order of magnitude. CoCrFeMnMoxNi high entropy alloy coating is mainly composed of FCC solid solution and Rhombohedral solid solution. CoCrFeMnMoNi High Entropy Alloy CoCrFeMnMoNi High Entropy Alloy CoCrFeMnMo1.5Ni High Entropy Alloy CoCrFeMnMo1.5Ni High Entropy Alloy CoCrFeMnMo1.5Ni High Entropy Alloy coating has a layer spacing of sub-micron to nanocrystalline. The interlamellar spacing of the fine area of CoCrFeMnMoNi high entropy alloy coating can reach about 120nm. CoCrFeMnMo2Ni high entropy alloy coating has nanostructure precipitated. The average microhardness of the CoCrFeMnMo2Ni high entropy alloy coating with the highest hardness can be more than 700 HV0.2. The wear resistance of all high entropy alloy coatings in this system is better than that of the CoCrFeMnMoNiCoCrMnMo2Ni high entropy alloy coating with 06Crl9Ni10. The wear resistance of the CoCrFeMnMo2Ni high entropy alloy coating is better than that of the 06Crl9Ni10 CoCrFeMnMo2Ni high entropy alloy coating. Wear resistance is the best. In 3.5% NaCl solution, The corrosion resistance of all high-entropy alloy coatings in this system is better than that of the CoCrFeMnMo1.5NiCoCrFeMnMo2Ni high entropy alloy coating with 06Cr19Ni10. The self-corrosion current density of the CoCrFeMnMo1.5NiCoCrFeMnMo2Ni high entropy alloy coating is one order of magnitude smaller than that of 06Cr19Ni10. The latter can passivate. CoCrFeMnNiWx high entropy alloy coating is mainly composed of FCC solid solution, 畏 phase and M23C6. 畏 phase M23C6 in CoCrFeMnNiW1.5 high entropy alloy coating and FCC solid solution form two kinds of fishbone eutectic, respectively. However, the microstructure of CoCrFeMnNiW2 high entropy alloy coating is more fine and the coarse 畏 phase is precipitated separately. The average microhardness of CoCrFeMnNiW1.5 and CoCrFeMnNiW2 high entropy alloy coating with the highest hardness is more than 700 HV0.2. The resistance of all high entropy alloy coatings in this system is more than 700 HV0.2. CoCrFeMnNiW, CoCrFeMnNiW1.5 and CoCrFeMnNiW2 high entropy alloy coatings all have excellent wear resistance. The wear resistance of CoCrFeMnNiW2 high entropy alloy coating is the best. In the NaCl solution with 3.5% mass fraction of CoCrFeMnNiW2, the wear resistance of CoCrFeMnNiW2 is better than that of CoCrFeMnNiW1.The wear resistance of CoCrFeMnNiW2 high entropy alloy coating is the best. With the exception of CoCrFeMnNiW high entropy alloy coating, the corrosion current density of the other coatings is in the same order of magnitude as that of 06Cr19Ni10.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG174.4

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