不锈钢表面FeCoCrAlCuNiMo_x激光高熵合金化层的相演变

发布时间：2018-06-24 23:57

本文选题：不锈钢 + 激光高熵合金化　；参考：《金属学报》2016年07期

【摘要】：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,摩尔分数)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390~490HV之间,且Mo含量的增加显著提高高熵合金化层的硬度.
[Abstract]:FeCoCrAlCuNiMox (0.5 mol fraction) laser high entropy alloying layer was prepared on the surface of 2Cr13 stainless steel by laser high entropy alloying technique. The phase transformation mechanism, microstructure and hardness of FeCoCrAlCuNiMox laser high entropy alloying layer were studied by XRDX SEMS-EDS and microhardness tester. The results show that Fe2Cr13 stainless steel substrates take part in the process of surface alloying under laser irradiation, forming FeCoCrAlCuNiMox laser high entropy alloying layer, with the increase of Mo content. The phase structure of alloying layer is gradually changed from fcc bcc two-phase solid solution structure to fcc bcc hcp three-phase coexisting HCP phase, and the content of Ni3Mo phase is higher than that of Co7Mo6 phase, and the solidification temperature of melting pool plays an important role in the phase selection of laser high-entropy alloying layer. The microstructure of laser high entropy alloying layer is typical dendritic structure, and with the increase of Mo content, the microhardness of bulk Ni _ 3Mo and Co _ 7Mo _ 6 phase. FeCoCrAlCuNiMox laser high entropy alloying layer is in the range of 390 ~ 490HV. The hardness of high entropy alloying layer was increased with the increase of Mo content.
【作者单位】：沈阳工业大学材料科学与工程学院;沈阳鼓风机集团核电泵业有限公司;
【基金】：国家自然科学基金项目51271126 沈阳市科技计划项目F16-032-0-00资助~~
【分类号】：TG174.4

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