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Powder Metallurgy Volume 58, 2015 - Issue 5
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Original Research Paper

Microstructure characterisation and tensile properties of MIM418 superalloy

L. ZhangBeijing Key Laboratory for Powder Metallurgy and Particulate Materials, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing100083, ChinaCorrespondence[email protected]
,
D. LiBeijing Key Laboratory for Powder Metallurgy and Particulate Materials, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing100083, China
,
X. ChenBeijing Key Laboratory for Powder Metallurgy and Particulate Materials, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing100083, China
,
X. QuBeijing Key Laboratory for Powder Metallurgy and Particulate Materials, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing100083, China
,
M. QinBeijing Key Laboratory for Powder Metallurgy and Particulate Materials, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing100083, China
,
X. HeBeijing Key Laboratory for Powder Metallurgy and Particulate Materials, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing100083, China
,
Z. LiNational Key Lab of High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing100095, China
&
F. YangNational Engineering Research Center for Non-ferrous Metal Composites, Beijing General Research Institute for Non-ferrous Metals, Beijing, China
 show all
Pages 354-362 | Received 10 Apr 2015, Accepted 30 Jun 2015, Published online: 19 Feb 2016
 
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Abstract

Metal injection moulding in conjunction with hot isostatic pressing was applied to prepare MIM418 superalloy. Densification behaviour, precipitated phases and tensile properties of the alloy were characterised. Relative density of 97.6% is obtained after vacuum sintering at 1240°C, and near full dense alloy is achieved after HIPing. High volume fraction (57%) of near cuboidal γ’ phase with average particle size of 0.52 μm precipitates homogeneously in γ matrix. Small amount of fine carbides with average particle size of 0.22 μm distribute mainly along grain boundaries and in grain interior. Average grain size of the superalloy is estimated to be ∼26 μm. Uniformly distributed precipitates and fine grain size lead to significant improvement of mechanical properties. The tensile strength, yield strength and ductility of MIM418 superalloy achieve 1425 MPa, 1004 MPa and 19.4% respectively, which are much higher than that of the cast K418 superalloy.

Acknowledgements

This work is financially supported by National High Technology Research and Development Program of China (863 Program) (2012AA03AA514), Beijing Natural Science Foundation (2132046) and National Nature Science Foundation of China (51374027).

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