采用热等静压（HIP）工艺，以在增材制造钛合金（Ti-6Al-4V）中实现各向同性微观结构并保留其成型后的强度。
Hot isostatic pressing (HIP) to achieve isotropic microstructure and retain as-built strength in an additive manufacturing titanium alloy (Ti-6Al-4V).
作者信息
Benzing Jake, Hrabe Nik, Quinn Timothy, White Ryan, Rentz Ross, Ahlfors Magnus
机构信息
National Institute of Standards and Technology, Applied Chemicals and Materials Division, 325 Broadway, MS-647, Boulder, CO 80305, USA.
Quintus Technologies, 8270 Green Meadows Dr. N, Lewis Center, OH 43035, USA.
出版信息
Mater Lett. 2019;257. doi: 10.1016/j.matlet.2019.126690.
Hot isostatic pressing (HIP) treatments are traditionally used to seal internal porosity, because defects exist in as-built Ti-6Al-4V parts produced by electron-beam melting powder-bed fusion. Standard HIP treatment of Ti-6Al-4V parts results in decreased strength due to coarsening of the microstructure. We present a new HIP strategy with the following steps: hold above the β-transus, rapid quenching, and tempering. This new HIP treatment seals internal porosity, causes a columnar-to-equiaxed transition in morphology of prior-β grains, changes the α lath aspect ratio, removes microstructural heterogeneities and matches the yield and ultimate tensile strength of the as-built condition.
传统上，热等静压（HIP）处理用于封闭内部孔隙，因为通过电子束熔化粉末床熔合制造的增材制造Ti-6Al-4V零件存在缺陷。Ti-6Al-4V零件的标准HIP处理会因微观结构粗化而导致强度降低。我们提出了一种新的HIP策略，包括以下步骤：在β转变温度以上保温、快速淬火和回火。这种新的HIP处理封闭了内部孔隙，使原始β晶粒形态发生柱状到等轴的转变，改变了α板条的长宽比，消除了微观结构的不均匀性，并使屈服强度和极限抗拉强度与增材制造状态相匹配。
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