制备方法对3D打印用Ti-6Al-4V合金粉体特性的影响

Effects of preparation methods on the properties of Ti-6Al-4V alloys powders for 3D printing

以等离子旋转电极雾化法(PREP)、无坩埚电极感应熔化气体雾化法(EIGA)、等离子体火炬雾化法(PA)三种方法制备的Ti-6Al-4V粉末为原料,采用扫描电镜(SEM)、激光粒度分析仪(LPS)、X射线衍射分析仪(XRD)等方法,对粉末的形貌、微观组织结构、粒度及分布及物相组成进行了表征分析,同时对制备方法对3D打印用Ti-6Al-4V合金粉末粉体特性的影响进行了研究.研究结果表明:PREP制备的粉末表面最为光洁,呈规则球形;EIGA制备的粉末多呈近球形,表面粘附卫星球较多;PA制备的粉末形貌为近规则球形,表面粘附少量小颗粒卫星球.三种Ti-6Al-4V粉末的粒度均呈单峰正态分布,其中EIGA粉末粒度分布较宽,而PREP和PA两种粉末呈窄粒径分布.三种粉末内部组织结构一致,主要由针状马氏体α′相构成.

This article used three types of Ti-6Al-4V alloy powders which produced by Plasma rotating electrode processing,no crucible induction melting electrode gas atomization method and plasma torch atomization,as the raw material.The morphology,microstructure,particle size and distribution,and phase composition of Ti-6Al-4V alloy powders were analyzed by scanning electron microscope（SEM）,laser particle size analyzer（LPS）,X-ray diffraction（XRD）.Meanwhile the effects of preparation methods on the properties of Ti-6Al-4V alloy powders for 3D printing were investigated.The results indicate that the PREP powders has an smooth surface and standard spherical morphology.The EIGA powders has an approximately spherical morphology and generally rough surface,with lots of satellite particles.And the PA powder is nearly standard spherical and with little satellite particles.Three kinds of powder size distribution are unimodal normal distribution.And the EIGA powder size distribution wider than PREP and PA powder.In addition,the microstructure of the three kinds of powder are mainly composed of acicular martensiteα′phase.