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Title: The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation

Abstract

The effects of temperature and thermomechanical loading on the tensile strength and hardness were studied for a rolled, low-cost metastable β titanium alloy, Ti-13Cr-1Fe-3Al (wt.%). Tensile tests were performed at temperatures between room temperature (RT) and 410°C. The results indicated that the ultimate tensile strength (UTS) decreased with increasing temperatures up to 300°C. However, the UTS was 1400 MPa at 410°C, which was approximately 150% higher than the RT UTS. It is believed that the formation of nanoscale ω and α precipitates, identified using transmission electron microscopy, hindered the dislocation motion, which resulted in the exceptionally high UTS at 410°C. However, ductility was maintained, as the elongation-to-failure (ϵ f) was 10% at 410°C. Dynamic mechanical analysis suggested that phase transformations occurred between 370°C-475°C. To evaluate the effect of the phase transformations on the hardness, the as-received material was heat treated at 400°C, 450°C, and 500°C for 2 h, which resulted in hardness values of approximately 340 Hv, 380 Hv, and 470 Hv, respectively. However, the greatest hardness value (500 Hv) was exhibited by the as-received material after it was tensile tested at 410°C. This suggested that both temperature and loading history affected the phase transformations. Finally, as all the samplesmore » exhibited a ductile fracture mode, this work indicates that it is possible to maintain both high strength and adequate ϵ f for Ti-13Cr-1Fe-3Al (wt.%).« less

Authors:
 [1];  [2];  [1]; ORCiD logo [1]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Kansai Univ., Suita (Japan)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1595235
Grant/Contract Number:  
SC0001525; FG02-09ER46637
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 71; Journal Issue: 10; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Khademi, V., Ikeda, M., Hernández-Escobar, D., and Boehlert, C. J. The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation. United States: N. p., 2019. Web. doi:10.1007/s11837-019-03598-2.
Khademi, V., Ikeda, M., Hernández-Escobar, D., & Boehlert, C. J. The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation. United States. doi:10.1007/s11837-019-03598-2.
Khademi, V., Ikeda, M., Hernández-Escobar, D., and Boehlert, C. J. Wed . "The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation". United States. doi:10.1007/s11837-019-03598-2.
@article{osti_1595235,
title = {The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation},
author = {Khademi, V. and Ikeda, M. and Hernández-Escobar, D. and Boehlert, C. J.},
abstractNote = {The effects of temperature and thermomechanical loading on the tensile strength and hardness were studied for a rolled, low-cost metastable β titanium alloy, Ti-13Cr-1Fe-3Al (wt.%). Tensile tests were performed at temperatures between room temperature (RT) and 410°C. The results indicated that the ultimate tensile strength (UTS) decreased with increasing temperatures up to 300°C. However, the UTS was 1400 MPa at 410°C, which was approximately 150% higher than the RT UTS. It is believed that the formation of nanoscale ω and α precipitates, identified using transmission electron microscopy, hindered the dislocation motion, which resulted in the exceptionally high UTS at 410°C. However, ductility was maintained, as the elongation-to-failure (ϵf) was 10% at 410°C. Dynamic mechanical analysis suggested that phase transformations occurred between 370°C-475°C. To evaluate the effect of the phase transformations on the hardness, the as-received material was heat treated at 400°C, 450°C, and 500°C for 2 h, which resulted in hardness values of approximately 340 Hv, 380 Hv, and 470 Hv, respectively. However, the greatest hardness value (500 Hv) was exhibited by the as-received material after it was tensile tested at 410°C. This suggested that both temperature and loading history affected the phase transformations. Finally, as all the samples exhibited a ductile fracture mode, this work indicates that it is possible to maintain both high strength and adequate ϵf for Ti-13Cr-1Fe-3Al (wt.%).},
doi = {10.1007/s11837-019-03598-2},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 10,
volume = 71,
place = {United States},
year = {2019},
month = {6}
}

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