A Comparison of Creep-Rupture Tested Cast Alloys HR282, IN740 and 263 for Possible Application in Advanced Ultrasupercritical Steam Turbine and Boiler
Cast forms of traditionally wrought Ni-base precipitation-strengthened superalloys are being considered for service in the ultra-supercritical conditions (760°C, 35MPa) of next-generation steam boilers and turbines. After casting and homogenization, these alloys were given heat-treatments typical for each in the wrought condition to develop the gamma-prime phase. Specimens machined from castings were creep-rupture tested in air at 800°C. In their wrought forms, alloy 282 is expected to precipitate M<SUB>23</SUB>C<SUB>6</SUB> within grain boundaries, alloy 740 is expected to precipitate several grain boundary phases including M<SUB>23</SUB>C<SUB>6</SUB>, G Phase, and η phase, and alloy 263 has M<SUB>23</SUB>C6 and MC within its grain boundaries. This presentation will correlate the observed creep-life of these cast alloys with the microstructures developed during creep-rupture tests, with an emphasis on the phase identification and chemistry of precipitated grain boundary phases. The suitability of these cast forms of traditionally wrought alloys for turbine and boiler components will also be discussed.
- Research Organization:
- National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 1018330
- Report Number(s):
- NETL-TPR-3518
- Resource Relation:
- Conference: TMS Annual Meeting, San Diego,CA, Feb-Mar 2011
- Country of Publication:
- United States
- Language:
- English
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