MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MAR-M-247 NICKEL SUPERALLOY

1 Zýka Jiří
Co-authors:
1 Andršová Irena 1 Málek Jaroslav 1 Podhorná Božena 2 Joch Antonín 2 Hrbáček Karel
Institutions:
1 UJP PRAHA a.s., Prague, Czech Republic, EU, zyka@ujp.cz
2 PBS Velká Bíteš a.s., Velká Bíteš, EU, Czech Republic
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1606-1611
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
109 views / 227 downloads
Abstract

MAR-M-247 is a nickel-base superalloy developed for applications requiring high strength at elevated temperatures up to about 1000 ºC. Its balanced composition provides an excellent combination of tensile and creep-rupture properties as a result of gamma-prime strengthening enhanced by solid solution and grain-boundary strengthening. MAR-M-247 has good castability. It is usually used for turbine blades and turbocharger wheels castings. Heat treatment is usually applied.Different shape and weight of castings implies different conditions during solidifying and cooling resulting in different castings microstructure. When approving the castings, mechanical values are measured by tensile test on test bodies made from castings with different microstructure. This work investigates correlations between mechanical properties and microstructure, particularly grain size and texture, carbides, casting defects, and gamma-prime phase.

Keywords: Superalloys, microstructure, mechanical properties, carbides

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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