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Materials (Basel). 2013 Nov 1;6(11):5016-5037. doi: 10.3390/ma6115016.

Microstructure of Haynes® 282® Superalloy after Vacuum Induction Melting and Investment Casting of Thin-Walled Components.

Author information

1
Functional Materials Research Center, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland. huba@inmat.pw.edu.pl.
2
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland. m.zagorska@inmat.pw.edu.pl.
3
Guest, Keen and Nettlefolds (GKN) Aerospace Engine Systems Sweden, Trollhättan S-46181, Sweden. joel.andersson@gknaerospace.com.
4
Department of Engineering Science, University West, Trollhättan 46186, Sweden. joel.andersson@gknaerospace.com.
5
Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg 41296, Sweden. joel.andersson@gknaerospace.com.
6
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland. a.balkowiec@inmat.pw.edu.pl.
7
Wytwornia Sprzetu Komunikacyjnego, "Polskie Zaklady Lotnicze Rzeszow" S.A., Hetmanska 120, Rzeszow 35-078, Poland. rafal.cygan@wskrz.com.
8
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland. mrasin@o2.pl.
9
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland. marcinpisarek@interia.pl.
10
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland. mandrzejczuk@inmat.pw.edu.pl.
11
Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstancow Warszawy 8, Rzeszow 35-959, Poland. krkub@prz.edu.pl.
12
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland. kjk@inmat.pw.edu.pl.

Abstract

The aim of this work was to characterize the microstructure of the as-cast Haynes® 282® alloy. Observations and analyses were carried out using techniques such as X-ray diffraction (XRD), light microscopy (LM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray spectroscopy (EDS), wave length dispersive X-ray spectroscopy (WDS), auger electron spectroscopy (AES) and electron energy-loss spectrometry (EELS). The phases identified in the as-cast alloy include: γ (gamma matrix), γ' (matrix strengthening phase), (TiMoCr)C (primary carbide), TiN (primary nitride), σ (sigma-TCP phase), (TiMo)₂SC (carbosulphide) and a lamellar constituent consisting of molybdenum and chromium rich secondary carbide phase together with γ phase. Within the dendrites the γ' appears mostly in the form of spherical, nanometric precipitates (74 nm), while coarser (113 nm) cubic γ' precipitates are present in the interdendritic areas. Volume fraction content of the γ' precipitates in the dendrites and interdendritic areas are 9.6% and 8.5%, respectively. Primary nitrides metallic nitrides (MN), are homogeneously dispersed in the as-cast microstructure, while primary carbides metallic carbides (MC), preferentially precipitate in interdendritic areas. Such preference is also observed in the case of globular σ phase. Lamellar constituents characterized as secondary carbides/γ phases were together with (TiMo)₂SC phase always observed adjacent to σ phase precipitates. Crystallographic relations were established in-between the MC, σ, secondary carbides and γ/γ' matrix.

KEYWORDS:

Haynes® 282®; investment casting; microstructure; superalloy; vacuum induction melting

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