Affiliation:
1. Institute for Energetics and Interphases CNR-IENI
2. Institute for Energetics and Interphases
Abstract
The creep behaviour of the solid solution strengthened nickel-based superalloy Haynes 230 has been investigated under constant load and temperature conditions on as received, after conventional solution treatment, and on overaged conditions. The experimental results have shown a very strong dependence of the creep curve shape with the applied stress/temperature: in the tests performed at high stresses/low temperatures, the primary/decelerating stage takes an important portion of the creep curve. At these test conditions, the accelerating creep is mainly caused by the increase of the applied stress with the strain as it happens in constant load creep tests. In the tests performed at low stresses/high temperatures, the primary stage is very small and the following accelerating creep is characterized by different accelerating creep stages. The analysis of the creep curves on the as received and overaged alloys, has shown that a large portion of the accelerating creep at low stresses/high temperatures is caused by microstructural instability.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference3 articles.
1. Haynes International, Haynes 230 Alloy Product Brochure. www. haynesintl. com.
2. J. Veverkova, A. Strang, G.R. Marchant, G.M. McColvin and H.V. Atkinson, in: Superalloys 2008, edited by R.C. Reed et al., The Minerals, Metals and Materials Society, Seven Springs, Champion, Pennsylvania, USA (2008).
3. G. Angella, V. Lupinc, M. Maldini, M. Pojaghi, E. Signorelli and A. Stefanuto, in COST 538 High Temperature Plant Lifetime Extensiont, WP3 Superalloy degradation Project title: Microstructural evolution and creep behaviour of alloys for gas turbines, Commission of European Communities.
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