Evaluating Ni-Based Alloys for A-USC Component Manufacturing and Use

The objective of this project is to evaluate advanced nickel (Ni)-based alloys to support the manufacturing and use of components under advanced ultra-supercritical (A-USC) steam conditions, which range up to 760 °C (1400 °F) and 35 MPa (5000 psig). In particular, this project focuses on evaluating materials from near-to-full-scale components, such as Haynes 282 large rotor forging, half-valve body casting, and steam turbine nozzle carrier casting, to provide insights into potential manufacturability issues related to large-scale components made from Ni-based alloys and engineering data and support for actual A-USC plant design. In addition, this project contains substantial efforts in weld characterization and long-term creep testing of Ni-based alloy weldment, which should provide useful data for filler metal selection and future ASME code qualification efforts for cast Haynes 282 weldment.