Microstructure of Haynes® 282® Superalloy after Vacuum Induction Melting and Investment Casting of Thin-Walled Components
Journal article, 2013

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), γʹ (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 γʹ appears mostly in the form of spherical, nanometric precipitates (74 nm), while coarser (113 nm) cubic γʹ precipitates are present in the interdendritic areas. Volume fraction content of the γʹ 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/γʹ matrix.

microstructure

Haynes® 282®

investment casting

superalloy

vacuum induction melting

Author

Hubert Matysiak

Warsaw University of Technology

Malgorzata Zagorska

Warsaw University of Technology

Joel Håkan Andersson

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Alicja Balkowiec

Warsaw University of Technology

Rafal Cygan

Polskie Zaklady Lotnicze Rzeszow S.A.

Marcin Rasinski

Warsaw University of Technology

Marcin Pisarek

Polish Academy of Sciences

Mariusz Andrzejczuk

Warsaw University of Technology

Krzysztof Kubiak

Politechnika Rzeszowska

Krzysztof J. Kurzydlowski

Warsaw University of Technology

Materials

1996-1944 (ISSN)

Vol. 6 11 5016-5037

Driving Forces

Sustainable development

Areas of Advance

Production

Energy

Materials Science

Roots

Basic sciences

Subject Categories

Other Materials Engineering

Metallurgy and Metallic Materials

DOI

10.3390/ma6115016

More information

Latest update

10/30/2018