Jiří Zýka, Irena Andršová, Jaroslav Málek, Božena Podhorná, Antonín Joch, Karel Hrbáček
Vliv mikrostruktury na mechanické vlastnosti niklové superslitiny MAR-M-247
Číslo: 11-12/2016
Periodikum: Slévárenství
Klíčová slova: superalloys—mechanical properties—structure
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Anotace:
MAR-M-247 is a ’ phase strengthened nickelbase
superalloy developed for applications
requiring high strength at elevated temperatures
up to about 1000ºC. MAR-M-247 has good
castability. It is usually used for turbine
blades and turbocharger wheels castings.
Heat treatment is usually applied; hot
isostatic pressing is frequently used as well.
Room tensile tests were per formed; results
are compared to IN713LC alloy. Different
shape and weight of castings investigated
implies different conditions during solidifying
and cooling resulting in different castings
microstructure. This work investigates
correlations between mechanical proper ties
and microstructure, par ticularly grain size,
carbides, casting defects, and gamma-prime
phase. Role of carbides is investigated more
thoroughly.
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superalloy developed for applications
requiring high strength at elevated temperatures
up to about 1000ºC. MAR-M-247 has good
castability. It is usually used for turbine
blades and turbocharger wheels castings.
Heat treatment is usually applied; hot
isostatic pressing is frequently used as well.
Room tensile tests were per formed; results
are compared to IN713LC alloy. Different
shape and weight of castings investigated
implies different conditions during solidifying
and cooling resulting in different castings
microstructure. This work investigates
correlations between mechanical proper ties
and microstructure, par ticularly grain size,
carbides, casting defects, and gamma-prime
phase. Role of carbides is investigated more
thoroughly.