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针对电子束选区熔化的特点,采用不同工艺参数成形了Ti6Al4V实体试样,并利用光学显微镜、扫描电子显微镜、透射电镜和X射线衍射仪研究了气雾化Ti6Al4V粉末在电子束选区熔化成形中的微观组织特征以及不同体能量密度(P/v)对微观组织的影响。结果表明:电子束选区熔化Ti6Al4V合金内部组织为细针状马氏体、魏氏组织和网篮组织,细针马氏体区位于试样成形顶部;随着体能量密度的增加马氏体区高度由7~8个铺粉层厚增加到22~25个铺粉层厚,内部组织由细长片状魏氏组织变为魏氏组织和网篮组织组成的双态组织,片状α相的厚度也由1~2μm增加到2~4μm。
According to the characteristics of electron beam selective melting, Ti6Al4V solid samples were formed by different process parameters. The effects of gas atomization Ti6Al4V powder on the electron beam melting were studied by using optical microscope, scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Microstructure characteristics and different body energy density (P / V) on the microstructure. The results show that the internal structure of the melted Ti6Al4V alloy is fine needle-like martensite, Weismannian and baskets, and the fine needle martensite is located at the top of the specimen. The martensitic region Height from 7 to 8 layers of powder layer thickness increased to 22 to 25 layers of powder layer thickness, the internal organization from the elongated sheet Wei’s tissue into Wei organization and basket organization composed of dual-state, lamellar α phase The thickness also increased from 1 ~ 2μm to 2 ~ 4μm.