Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 609, Issue -, Pages 241-249Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.04.079
Keywords
IMI 834; Near-alpha; Titanium alloys; Creep; Structure-property correlations
Categories
Funding
- Defence Research and Development Organisation (DRDO)
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High temperature creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the alpha (HCP) and beta (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in creep strain with decreasing solution treatment temperature and (ii) the U-shaped variation of creep strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure-mechanical property correlation and (b) to explain the observed variation in the creep behaviour of a near-alpha titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of creep curve is due to the counter acting nature of various microstructural features present in the material. (C) 2014 Elsevier B.V. All rights reserved.
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