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Physical and thermodynamic simulations of gamma-prime precipitation in Haynes (R) 282 (R) using arc heat treatment
Department of Materials Science and Engineering, School of Industrial Engineering and Management, KTH Royal Institute of Technology (SWE).
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-6242-3517
GKN Aerospace AB, SE-461 38 Trollhättan (SWE).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-1607-9177
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2021 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 870, article id 159484Article in journal (Refereed) Published
Abstract [en]

Haynes 282 is a Ni-based gamma prime (gamma’) strengthening alloy with a balanced combination of high temperature properties and fabricability. This paper aims to study the evolution of the microstructure and hardness using a novel physical simulation method called arc heat treatment, followed by thermodynamic modeling of gamma’ precipitation. For the arc heat treatment, a steady state temperature gradient was generated using a stationary tungsten inert gas arc on a sample mounted onto a water-cooled chamber. The steady state condition ranged from room temperature to the liquidus and was achieved within the first few sec-onds. Aged and solutionized samples were arc heat treated for 1.5 min, 30 min, and 4 h. The experiments were complemented with temperature modeling, equilibrium calculations, and gamma’ precipitation simulations. A unique graded microstructure formed in the arc heat-treated samples. It consisted of a fusion zone with a dendritic microstructure; a region with the dissolution of all secondary phases (MC carbides, grain boundary carbides, and gamma’); a region with MC and grain boundary carbides; a gamma’ precipitation zone; and the base metal. The temperature range of the dissolution area extended to lower temperatures with increasing arc heat treatment dwell time. The gamma’ precipitation zone showed a distinct etching response coupled with high hardness. The hardness and the temperature range of the gamma’ precipitation zone increased with increasing arc heat treatment time. The gamma’ radii increased with increasing time and temperature. The gamma’ precipitation model, simulated with TC Prisma, showed very good agreement with the experimental results. Finally, the results were used to develop time-temperature precipitation and hardness diagrams. (c) 2021 The Authors. Published by Elsevier B.V. CC_BY_4.0

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 870, article id 159484
Keywords [en]
High-temperature alloys; Precipitation; Grain boundaries; Kinetics; Thermodynamic modeling
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17223DOI: 10.1016/j.jallcom.2021.159484ISI: 000641325500004Scopus ID: 2-s2.0-85102989182OAI: oai:DiVA.org:hv-17223DiVA, id: diva2:1620750
Available from: 2021-12-16 Created: 2021-12-16 Last updated: 2022-03-30

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Hosseini, VahidHanning, FabianAndersson, Joel

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