Hot isostatic pressing (HIP) to achieve isotropic microstructure and retain as-built strength in an additive manufacturing titanium alloy (Ti-6Al-4V).

Autor: Benzing J; National Institute of Standards and Technology, Applied Chemicals and Materials Division, 325 Broadway, MS-647, Boulder, CO 80305, USA., Hrabe N; National Institute of Standards and Technology, Applied Chemicals and Materials Division, 325 Broadway, MS-647, Boulder, CO 80305, USA., Quinn T; National Institute of Standards and Technology, Applied Chemicals and Materials Division, 325 Broadway, MS-647, Boulder, CO 80305, USA., White R; National Institute of Standards and Technology, Applied Chemicals and Materials Division, 325 Broadway, MS-647, Boulder, CO 80305, USA., Rentz R; National Institute of Standards and Technology, Applied Chemicals and Materials Division, 325 Broadway, MS-647, Boulder, CO 80305, USA., Ahlfors M; Quintus Technologies, 8270 Green Meadows Dr. N, Lewis Center, OH 43035, USA.
Jazyk: angličtina
Zdroj: Materials letters [Mater Lett] 2019; Vol. 257.
DOI: 10.1016/j.matlet.2019.126690
Abstrakt: 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.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Databáze: MEDLINE
Externí odkaz: