不锈钢表面FeCoCrAlCuNiMo_x激光高熵合金化层的相演变
PHASE EVOLUTION OF FeCoCrAlCuNiMo_x COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS
查看参考文献30篇
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文摘
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采用激光高熵合金化技术在2Crl3不锈钢表面制备FeCoCrAlCuNiMo_x(x=0,0.5,1,摩尔分数)激光高熵合金化层.利用XRD, SEM, EDS及显微硬度计对FeCoCrAlCuNiMo,激光高熵合金化层的相转变机制、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 FeCoCrAlCuNiMo_x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Ni_3Mo和Co_7Mo_6,且Ni_3Mo相含量高于Co_7Mo_6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Ni_3Mo和Co_7Mo_6相.FeCoCrAlCuNi-Mo,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. |
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其他语种文摘
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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-Mo_x (x=0, 0.5, 1) powder system with close-to-equiatomic ratios was mixed and laser surface alloyed onto 2Crl3 stainless steel substrates, and then the FeCoCrAlCuNiMo_x HEA coatings were obtained by reaction synthesis of Fe, Cr with Co-Al-Cu-Ni-Mo_x powder. The phase transition mechanism, microstructure and microhardness of FeCoCrAlCuNi-MO_x coatings were investigated by XRD, SEM, EDS and microhardness tester. Experimental results showed that the principal elements of Fe, Cr in 2Crl3 stainless steel substrate participated in surface alloying process during the laser irradiation, forming FeCoCrAlCuNiMo_x laser high-entropy alloying coatings. With the increase of Mo content, the crystal structures of FeCoCrAlCuNiMo_x 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 Ni_3Mo and Co_7Mo_6, and the content of Ni_3Mo phase was higher than that of Co_7Mo_6. The phase formation analysis indicated that besides Q 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 Ni_3Mo and Co_7Mo_6 precipitated in the innerdendritic regions. The microhardness of the FeCoCrAlCuNiMo_x laser high-entropy alloying coatings was 390~490 HV, which significantly increased with the increase of Mo content. |
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来源
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金属学报
,2016,52(7):797-803 【核心库】
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DOI
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10.11900/0412.1961.2016.00004
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关键词
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不锈钢
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激光高熵合金化
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相结构
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硬度
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地址
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1.
沈阳工业大学材料科学与工程学院, 沈阳, 110870
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沈阳鼓风机集团核电泵业有限公司, 沈阳, 110869
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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辽宁省沈阳市科技计划项目
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文献收藏号
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CSCD:5741680
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