期刊
MATERIALS LETTERS
卷 257, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.matlet.2019.126690
关键词
Additive manufacturing; Hot isostatic pressing; Microstructure; Recrystallization; Ti-6Al-4V
资金
- National Research Council Postdoctoral Research Associateship at the National Institute of Standards and Technology
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 beta-transus, rapid quenching, and tempering. This new HIP treatment seals internal porosity, causes a columnar-to-equiaxed transition in morphology of prior-beta grains, changes the alpha lath aspect ratio, removes microstructural heterogeneities and matches the yield and ultimate tensile strength of the as-built condition. Published by Elsevier B.V.
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