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Indexed by:期刊论文

Date of Publication:2016-08-15

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:676

Page Number:202-208

ISSN No.:0925-8388

Key Words:Inconel 740 superalloy; Electron beam smelting; Microstructure; Vickers hardness; Oxidation behavior

Abstract:A novel method, namely electron beam smelting (EBS) technology was used to prepare the Inconel 740 superalloy. The microstructures, hardness and oxidation behavior were characterized and compared with the traditionally prepared Inconel 740 superalloy. The results imply that the solution treatment gives rise to the coarsening of gamma' precipitates, with further aging treatment, the gamma' precipitates with size of less than 30 nm are distributed dispersively in the matrix, leading to a decreasing of the lattice parameters and an increasing of the misfit. The gamma' precipitates result in shearing mechanism of weakly pair coupling. The EBS 740 superalloy produces better properties than that prepared in the traditional method in both precipitation strengthening effect and oxidation resistance. (C) 2016 Elsevier B.V. All rights reserved.