Abstract
The stress relaxation behavior of a recently developed, low coefficient-of-thermal expansion superalloy, INCONEL® alloy 783, 1 has been studied in the temperature range from 482 to 649°C and at two different strain levels of 0.1 and 0.2%. These conditions are representative of bolting applications in steam turbines. The initial stress increase, observed at the lower temperatures and stresses, is correlated with dimensional instabilities upon extended exposures at the same temperatures, i.e. the volumetric shrinkage measured in situ in a dilatometer. The experimental results are discussed in the context of creep and transformation strains.
Original language | English |
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Pages (from-to) | 122-127 |
Number of pages | 6 |
Journal | Materials Science and Engineering: A |
Volume | 271 |
Issue number | 1-2 |
DOIs | |
State | Published - Nov 1 1999 |
Funding
The authors wish to thank M.D. Wyrick for his assistance in the dilatometer experiments. Research conducted at the HTML was sponsored by the US Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, under contract DE-ACD05-96OR22464 with Lockheed Martin Energy Research Corporation.
Keywords
- Alloys
- Dimensional stability
- INCONEL®
- Stress relaxation