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Metallurgical Effects On Long-Term Creep-Rupture In A New Nickel-Based Alloy, John P Shingledecker
Metallurgical Effects On Long-Term Creep-Rupture In A New Nickel-Based Alloy, John P Shingledecker
Doctoral Dissertations
A series of creep-rupture studies were conducted on a new nickel-based alloy, Inconel Alloy 740, for use in Advanced Ultrasupercritical (A-USC) Steam boiler applications. The research quantitatively showed, for the first time, that the formation of a small amount of eta phase during long-term creep testing at 750 degrees Celsius does not degrade the rupture strength or ductility of the alloy. A unique full-scale pressurized tubular creep test was conducted, and a new analysis methodology was developed to evaluate the effect of cold-straining on the creep performance of tube bends made from the alloy. The results showed that 15% cold-work …