Texture studies of hot compressed near alpha titanium alloy (IMI 834) at 1000°C with different strain rates

Kodli, B K and Saxena, K K and Dey, Suhash Ranjan and Pancholi, V and Bhattacharjee, A (2015) Texture studies of hot compressed near alpha titanium alloy (IMI 834) at 1000°C with different strain rates. In: 17th International Conference on Textures of Materials, 24-29 August, 2014, Dresden; Germany.

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Abstract

IMI 834 Titanium alloy is a near alpha (hcp) titanium alloy used for high temperature applications with the service temperature up to 600°C. Generally, this alloy is widely used in gas turbine engine applications such as low pressure compressor discs. For these applications, good fatigue and creep properties are required, which have been noticed better in a bimodal microstructure, containing 15-20% volume fraction of primary alpha grains (αp) and remaining bcc beta (β) grains transformed secondary alpha laths (αs). The bimodal microstructure is achieved during processing of IMI 834 in the high temperature α+β region. The major issue of bimodal IMI 834 during utilization is its poor dwell fatigue life time caused by textured macrozones. Textured macrozone is the spatial accumulation of similar oriented grains in the microstructure generated during hot processing in the high temperature α+β region. Textured macrozone can be mitigated by controlling the hot deformation with certain strain rate under stable plastic conditions having β grains undergoing dynamic recrystallization. Hence, a comprehensive study is required to understand the deformation behavior of α and β grains at different strain rates in that region. Hot compression tests up to 5°% strain of the samples are performed with five different strain rates i.e. 10-3 s-1, 10-2 s-1, 10-1 s-1, 1 s-1 and 10 s-1 at 1000°C using Gleeble 3800. The resultant bimodal microstructure and the texture studies of primary alpha grains (αp) and secondary alpha laths (αs) are carried out using scanning electron microscopy (SEM)-electron back scattered diffraction (EBSD) method.

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IITH Creators:

IITH Creators	ORCiD
Dey, Suhash Ranjan	http://orcid.org/0000-0002-5148-9534

Item Type:

Conference or Workshop Item (Paper)

Uncontrolled Keywords:

Alloys; Compression testing; Deformation; Dynamic recrystallization; Fatigue of materials; Gas compressors; Gas turbines; High temperature applications; Microstructure; Scanning electron microscopy; Textures; Titanium; Titanium alloys Bi-modal microstructures; Creep properties; Deformation behavior; Electron back-scattered diffraction; IMI-834 titanium alloy; Low pressure compressor; Near alpha titanium alloys; Service temperature; ICOTOM 2014

Subjects:

Others > Metallurgy
Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

Team Library

Date Deposited:

18 May 2015 06:46

Last Modified:

07 Sep 2017 09:08

URI:

http://raiithold.iith.ac.in/id/eprint/1508