Hits:

Indexed by:期刊论文

Date of Publication:2017-04-01

Journal:JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

Included Journals:SCIE、EI、Scopus

Volume:26

Issue:4

Page Number:1581-1588

ISSN No.:1059-9495

Key Words:gamma prime (gamma '); hardness; inertia friction welding; microstructure; powder metallurgy nickel-based superalloy

Abstract:A gamma prime (gamma') precipitation (similar to 35% in volume)-hardened powder metallurgy (P/M) superalloy FGH96 was welded using inertia friction welding (IFW). The microstructure and gamma' distributions in the joints in two conditions, hot isostatic pressed state and solution-treated and aged state, were characterized. The recrystallization of grains, the dissolution and re-precipitation of gamma' in the joints were discussed in terms of the temperature evolutions which were calculated by finite element model analysis. Regardless of the initial states, fully recrystallized fine grain structure formed at welded zone. Meanwhile, very fine gamma' precipitations were re-precipitated at the welded zone. These recrystallized grain structure and fine re-precipitated gamma' resulted in increasing hardness of IFW joint while making the hardness dependent on the microstructure and gamma' precipitation.