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通过电子束选区熔化(EBSM)快速制造的方法制备了不同熔覆面积的Ti-6Al-4V试样,并分析了熔覆面积对组织和硬度的影响。结果表明:EBSM快速成型件的微观组织主要由大量不同取向的片层状α相和残余β相所组成,并且随着熔覆面积的增加由细小的团絮状和片状组织逐渐向粗大规则的网篮状组织转变;EBSM快速成型件的微观组织中α相比例为60%~70%,α相体积分数随着熔覆面积的增加而逐渐增加,尺寸明显粗化,残留的β相逐渐减少;EBSM快速成型件的硬度在368~450 HV,并且随着熔覆面积的增加而逐渐增加。
The Ti-6Al-4V samples with different cladding areas were prepared by electron beam selective melting (EBSM), and the effect of cladding area on microstructure and hardness was analyzed. The results show that the microstructure of EBSM rapid prototyping parts is mainly composed of a large number of lamellar α phase and residual β phase with different orientations. With the increase of the cladding area, the fine floccules and lamellar tissues gradually increase to coarse rules . The proportion of alpha phase in the microstructure of EBSM rapid prototyping parts was 60% -70%. The volume fraction of α phase increased gradually with the increase of the cladding area, the size was coarse and the residual β phase gradually increased Reduce; EBSM rapid prototyping hardness of 368 ~ 450 HV, and with the increase of cladding area increases.