|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||C-16: Temperature Dependence of the Fracture Behavior of X-750 Alloy and Effect of Heat Treatment
||Christopher Marsh, Djamel Kaoumi
|On-Site Speaker (Planned)
X-750 is a nickel-chromium based superalloy applied in a variety of applications such as gas turbines, rocket engines, nuclear reactors. The fracture mechanism of X-750 was investigated at different temperatures both on heat-treated and non-heat-treated samples. Uniaxial tensile tests were conducted from room temperatures up to 900ºC; fracture surfaces were analyzed by means of SEM observations. The microstructure of both HT and NHT materials were studied utilizing SEM and TEM. Between room temperature and 650°C, the fracture surface of HT material evolves from purely intergranular to purely transgranular, while the rupture of the NHT is due to the coalescence of voids induced by decohesion at the MC carbides/matrix interface. Environmentally-induced intergranular cracking and ductility minimum were observed at 750ºC for both NHT and HT specimen. At higher temperatures such as 900ºC, the grain boundary mobility during dynamic recrystallization increases and leads to rupture by grain boundary slipping.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)