Microscale drivers and mechanisms of fracture in post-processed additively manufactured Ti–6Al–4V

Draelos-Hagerty, Lara; Nandwana, Peeyush; Srivastava, Ankit

doi:10.1007/s10704-023-00716-9

Title: Microscale drivers and mechanisms of fracture in post-processed additively manufactured Ti–6Al–₄V

Journal Article · Sat Jun 24 00:00:00 EDT 2023 · International Journal of Fracture

DOI:https://doi.org/10.1007/s10704-023-00716-9· OSTI ID:1997724

Draelos-Hagerty, Lara ^[1]; Nandwana, Peeyush ^[2]; Srivastava, Ankit ^[1]

Texas A & M University, College Station, TX (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Herein, we focus on understanding the microstructure-fracture correlations in a Ti–6Al–₄V alloy additively manufactured via electron beam melting (EBM) and subjected to various post-process heat-treatments. Specifically, the as fabricated material is subjected to a sub-transus heat-treatment followed by air-cooling and a super-transus heat-treatment followed by either air- or furnace-cooling. Next, a series of in-situ single edge notch tension (SENT) tests are carried out under a high-resolution digital optical microscope. The panoramic high-resolution images captured during the in-situ tests are then used to characterize the planar deformation on the specimen surface using microstructure-based digital image correlation (DIC). Additionally, the results of the in-situ SENT tests together with DIC and post-mortem fractographic analyses provided us with a better understanding of the microstructure-fracture correlations in these materials. Our results show that the fracture mechanism of the as fabricated and sub-transus heat-treated materials is essentially the same, while the changes in the microstructure following the super-transus heat-treatments significantly affects the fracture mechanism. In this case, several microcracks of hundreds of microns in length first nucleate away from the deformed notch following extreme plastic deformation at discrete locations. Furthermore, the location of these microcracks in the super-transus heat-treated materials is extremely sensitive to the details of the underlying microstructure.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; CMMI-1944496

OSTI ID:: 1997724

Journal Information:: International Journal of Fracture, Vol. 242, Issue 2; ISSN 0376-9429

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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