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NbMoTaNiCr难熔高熵合金线弧增材制造成形性研究

Study on formability of NbMoTaNiCr refractory high entropy alloy wire arc additive manufacturing

  • 摘要: 高熵合金传统制造方法一般为真空电弧熔炼和机械合金化法等,此类方法在成型尺寸上受到限制,为了解决高熵合金在成形制造方面所存在的问题,因此本为采用创新形式的揽丝电弧增材,并为探究TIG电弧增材制造工艺参数对NbMoTaNiCr难熔高熵合金成形性的影响,提高难熔高熵合金的成形质量,对NbMoTaNiCr难熔高熵合金进行五因素五水平成形正交实验,研究电流、电极间距、送丝速度、堆积速度、气体流量对高熵合金成形质量的影响。最终研究结果表明,电流对NbMoTaNiCr难熔高熵合金成形质量的影响最大,并且根据正交实验结果分析得出当:当电流为120A,此时NbMoTaNiCr难熔高熵合金成形质量达到最优。同时发现NbMoTaNiCr难熔高熵合金主要由FCC相+少量μ相组成,并且其平均硬度为911HV,其压缩屈服强度为545.5MPa,断裂应变为9.5%,其断裂机制表现为脆性解理断裂。

     

    Abstract: The traditional manufacturing methods for high entropy alloys are generally vacuum arc melting and mechanical alloying, which are limited in forming size. In order to solve the problems in forming and manufacturing of high entropy alloys, an innovative form of wire drawing arc additive was adopted. To explore the influence of TIG arc additive manufacturing process parameters on the formability of NbMoTaNiCr refractory high entropy alloys and improve the forming quality of refractory high entropy alloys, a five factor and five level orthogonal forming experiment was conducted on NbMoTaNiCr refractory high entropy alloys to study the effects of current, electrode spacing, wire feeding speed, stacking speed, and gas flow rate on the forming quality of high entropy alloys. The final research results indicate that the current has the greatest impact on the forming quality of NbMoTaNiCr refractory high entropy alloy. According to the analysis of orthogonal experimental results, it is found that when the current is 120A, the forming quality of NbMoTaNiCr refractory high entropy alloy reaches the optimal level. Meanwhile, it was found that NbMoTaNiCr refractory high entropy alloy is mainly composed of FCC phase and a small amount μ Phase composition. And its average hardness is 911HV. Its compressive yield strength is 545.5MPa, fracture strain is 9.5%, and its fracture mechanism exhibits brittle cleavage fracture.

     

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