|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Influence of Deformation and Heat Treatment on the Microstructure Evolution in the Nickel Superalloy 625
||Simon Malej, Jožef Medved, Franc Tehovnik, Jaka Burja, Franci Vode, Arh Boštjan, Barbara Šetina Batič, Elena Chernyshova, Matjaž Godec
|On-Site Speaker (Planned)
The scope of this work is to investigate the influence of deformation and heat treatment on the microstructure evolution in the nickel superalloy 625. Deformation dilatometry was used, where both the deformation and heat-treatment parameters were controlled. The microstructure was characterised by SEM, where the EDS and EBSD methods were employed to characterise the various phases and the grain structure. We also used TEM to determine the finest precipitates and their orientational relationships. Hardness and tensile tests were conducted to better understand the influence of the different treatments on the mechanical properties. The nickel superalloy 625 is prone to the precipitation of different intermetallic phases, like γ''-(Ni<SUB>3</SUB>Nb), δ-(Ni<SUB>3</SUB>Nb) and secondary carbides, like M<SUB>23</SUB>C<SUB>6</SUB> in different temperature zones. During hot deformation the nickel superalloy 625 dynamically recrystallizes via the well-known necklace mechanism. Different deformation and heat treatment conditions led to different microstructure constituents, with different influence on the mechanical properties.
||Planned: Supplemental Proceedings volume