Citation
Milenkovic, Srdjan and Sabirov, Ilchat and Llorca Martinez, Francisco Javier
(2012).
Effect of the cooling rate on microstructure and hardness of MAR-M247 Ni-based superalloy.
"Materials Letters", v. 73
;
pp. 216-219.
ISSN 0167-577X.
https://doi.org/10.1016/j.matlet.2012.01.028.
Abstract
The effect of cooling rate on the microstructure of MAR-M247 Ni-based superalloy was investigated via physical simulation of the casting process. Solidification experiments with cooling rates in the range of 0.25–10 K/s showed smooth temperature profiles with measured cooling rates matching the set values. The MAR-M247 showed cellular (0.25 K/s) and dendritic (1, 5 and 10 K/s) microstructures. Microconstituents also varied with cooling rates: γ/γ′ matrix with carbides and γ/γ′ eutectic at 0.25 K/s, γ/γ′ matrix with carbides at 1 K/s, and γ/γ′ matrix with carbides and γ/MC eutectic at 5 and 10 K/s. Moreover, the secondary dendritic arm spacing decreased and the hardness increased with the increase in the cooling rates.
