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不锈钢表面FeCoCrAlCuNiMox激光高熵合金化层的相演变
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-05-04
采用激光高熵合金化技术在2Cr13不锈钢表面制备FeCoCrAlCuNiMox (x = 0, 0.5, 1) 激光高熵合金化层. 利用XRD, SEM, EDS及显微硬度计对FeCoCrAlCuNiMox激光高熵合金化层相转变机制、微观组织形貌及硬度进行研究.
不锈钢表面FeCoCrAlCuNiMox激光高熵合金化层的相演变PHASE EVOLUTION OF FeCoCrAlCuNiMox COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS
采用激光高熵合金化技术在2Cr13不锈钢表面制备FeCoCrAlCuNiMox (x = 0, 0.5, 1) 激光高熵合金化层. 利用XRD, SEM, EDS及显微硬度计对FeCoCrAlCuNiMox激光高熵合金化层相转变机制、微观组织形貌及硬度进行研究. 结果表明, 2Cr13 不锈钢基材主元素Fe, Cr 在激光辐照条件下参与了表面合金化过程, 形成了FeCoCrAlCuNiMox激光高熵合金化层; 随着Mo含量的增加, 合金化层相结构逐渐由fcc+bcc双相固溶体结构转变为fcc+bcc+hcp三相共存, hcp相主要为Ni3Mo和Co7Mo6, 且Ni3Mo相含量高于Co7Mo6相, 熔池的凝固温度在激光高熵合金化层相选择过程中起到重要作用. 激光高熵合金化层显微组织为典型的枝晶组织; 随着Mo含量的增加, 枝晶内析出块状Ni3Mo和Co7Mo6相. FeCoCrAlCuNiMox激光高熵合金化层的显微硬度在390~490 HV之间, 且Mo 含量的增加显著提高高熵合金化层的硬度.
High-entropy alloys (HEAs), defined as solid solution alloys which have at least 5 principal elements but no more than 13 elements, with concentrations of each principal element ranging from 5% to 35% in atomic fraction, are emerging as one of the hot research frontiers in the metallic materials field. The significance of HEAs originates from their various combinations of high strength, good thermal stability and excellent resistance to corrosion, wear and oxidation. HEAs exhibit simple solid solutions with bcc and/or fcc structure(s) due to the effect of high mixing entropy in the solid solution state of HEAs, which may make the HEAs with improved mechanical and physical properties. However, a small quantity of intermetallic compounds can also form in certain HEAs, indicating that the formation of simple solid solutions cannot solely depend on the high mixing entropy. Then, the theory of HEAs based on the concept of entropy-enthalpy competition to judge whether or not simple phases will form was proposed. However, even if an alloy meets these criterions, it can still contain intermetallic phases. Why and how these intermetallics form in HEAs needs much more clarification. In this work, Co-Al-Cu-Ni-Mox (x = 0, 0.5, 1) powder system with close-to-equiatomic ratios was mixed and laser surface alloyed onto 2Cr13 stainless steel substrates, and then the FeCoCrAlCuNiMox HEA coatings was obtained by reaction synthesis of Fe, Cr with Co-Al-Cu-Ni-Mox powder. The phase transition mechanism, microstructure and microhardness of FeCoCrAlCuNiMox coatings were investigated by XRD, SEM, EDS and microhardness tester. Experimental results showed that the principal element of Fe, Cr in 2Cr13 stainless steel substrate participated in surface alloying process during the laser irradiation, forming FeCoCrAlCuNiMox laser high-entropy alloying coatings. With the increase of Mo content, the crystal structures of FeCoCrAlCuNiMox laser high-entropy alloying coatings evolved from fcc+bcc two-phase solid solution to fcc+bcc solid solution with hcp phase precipitations. The hcp phases were mainly Ni3Mo and Co7Mo6, and the content of Ni3Mo phase was higher than that of Co7Mo6. The phase formation analysis indicated that besides Ω and δ parameters, solidification temperature of the molten pool must be considered during the phase selection, instead of melting point as suggested previously. The microstructure of the coatings exhibited a typical dendrite structure. With the increase of Mo content, the block-shaped Ni3Mo and Co7Mo6 precipitated in the innerdendritic regions. The microhardness of the FeCoCrAlCuNiMox laser high-entropy alloying coatings was 390~490 HV, which significantly increased with the increase of Mo content.
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