|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||K-49: Microstructural Evolution of Ni-Superalloys during Hot Rolling and Thermal Aging
||Matjaz Godec, Simon Malej, Jaka Burja, Franc Tehovnik, Bojan Podgornik
|On-Site Speaker (Planned)
Ni-superalloy Inconel 625 has a high strength and high resistance to chloride-ion stress-corrosion and is therefore used in very aggressive environments. Inconel 625 was primary designed as a solid solution strengthening alloy by addition of chromium and molybdenum. However, during aging different intermetallic phases and carbides formed in the matrix and along grain boundaries. Intermetallic phase γ‘‘-(Ni<SUB>3</SUB>Nb) in the γ-matrix and precipitation of M<SUB>23</SUB>C<SUB>6</SUB> at the grain boundaries were formed at 650 °C aging temperature. The microstructure changes during the hot rolling of the Inconel 625 were investigated as well. A detailed insight into the recrystallization behaviour during hot rolling was provided by an EBSD analysis. During the hot rolling the recrystallization starts on the grain boundaries, followed by the twin grain boundaries and, at even higher stresses, the recrystallization occurs on the (TiNb)CN phases inside the crystal grains.
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