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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.
High-entropy alloying layer of FeCoCrAlCuNiMox (x = 0, 0.5, 1, mole fraction) laser was prepared on the surface of 2Cr13 stainless steel by laser high-entropy alloying technique.High entropy alloyation of FeCoCrAlCuNiMox laser was studied by XRD, SEM, EDS and microhardness tester Layer phase transition mechanism, microstructure and hardness were studied.The results show that the main elements Fe, Cr of 2Cr13 stainless steel substrate participate in the surface alloying process under the condition of laser irradiation, forming the high entropy alloyed layer of FeCoCrAlCuNiMox laser; With the increase of Mo content, the phase structure of the alloying layer gradually changes from fcc + bcc dual phase solid solution to fcc + bcc + hcp three phases coexist, hcp phase mainly Ni3Mo and Co7Mo6, and the content of Ni3Mo phase is higher than that of Co7Mo6 phase. The solidification temperature of the pool plays an important role in the phase selection process of laser high-entropy alloying layer.The microstructure of laser high-entropy alloyed layer is a typical dendritic structure. With the increase of Mo content, massive Ni3Mo And Co7Mo6.The microhardness of FeCoCrAlCuNiMox laser high entropy alloyed layer is between 390 and 490HV, and the increase of Mo content significantly enhances the hardness of high entropy alloyed layer.