|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Coal-Based Power
||C-7: Recent Development in the Characteristics of Alloy 625 for A-USC Steam Turbine Castings
||Wenlong Yu, Songfeng Liu, Yu Wang, Lingen Sun
|On-Site Speaker (Planned)
Raising the operating temperature and pressure of the steam turbine can improve the thermal efficiency in order to reduce the fossil fuel consuming and CO2 emissions. Alloy 625 is a solution strengthened Ni-base superalloy and has been considered as one possible candidate for A-USC steam turbine castings. In this research, we investigate the microstructure, tensile and creep behavior, low cycle fatigue property and long-term thermal stability of Alloy 625, which was produced by sand casting. The alloy exhibits excellent creep properties and thermal stability. Nb segregation has been found in the thick section and cannot be eliminated by heat treatment. The segregation can influence the mechanical properties and cause defects in large casings and valves. Alloy 625 can meet the design requirements of A-USC steam turbine, but also need further research on production process.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)