Analysis of microstructural facet fatigue failure in ultra-fine grained powder metallurgy Ti-6Al-4V produced through hydrogen sintering

Dunstan, Matthew K.; Paramore, James D.; Fang, Z. Zak; Ligda, Jonathan P.; Butler, Brady G.

doi:10.1016/j.ijfatigue.2019.105355

Analysis of microstructural facet fatigue failure in ultra-fine grained powder metallurgy Ti-6Al-4V produced through hydrogen sintering

Journal Article · Mon Oct 28 00:00:00 EDT 2019 · International Journal of Fatigue

DOI:https://doi.org/10.1016/j.ijfatigue.2019.105355· OSTI ID:1799184

Dunstan, Matthew K. ^[1]; Paramore, James D. ^[2]; Fang, Z. Zak ^[3]; Ligda, Jonathan P. ^[4]; Butler, Brady G. ^[4]

Univ. of Utah, Salt Lake City, UT (United States); United States Army Research Lab., Aberdeen Proving Ground, MD (United States); OSTI
Univ. of Utah, Salt Lake City, UT (United States); United States Army Research Lab., Aberdeen Proving Ground, MD (United States)
Univ. of Utah, Salt Lake City, UT (United States)
United States Army Research Lab., Aberdeen Proving Ground, MD (United States)

The hydrogen sintering and phase transformation (HSPT) process is a powder metallurgy method that produces Ti-6Al-4V with fatigue properties rivaling wrought processed Ti-6Al-4V. Previous fatigue work on HSPT Ti-6Al-4V has shown failure to be frequently caused by microstructural facets, which were believed to be grain boundary (GB) α phase. This belief conflicts with other reports as fatigue failure typically occurs across α colonies or primary α grains, not GB α. In this work, electron backscattered diffraction is used to identify these facets as GB α. Furthermore, a simple geometric model predicting the effective slip length of GB α is presented.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office

Grant/Contract Number:: EE0005761

OSTI ID:: 1799184

Alternate ID(s):: OSTI ID: 1776374

Journal Information:: International Journal of Fatigue, Journal Name: International Journal of Fatigue Vol. 131; ISSN 0142-1123

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Analysis of microstructural facet fatigue failure in ultra-fine grained powder metallurgy Ti-6Al-4V produced through hydrogen sintering

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