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This content will become publicly available on January 10, 2019

Title: Correlation of Precipitate Evolution with Vickers Hardness in Haynes (R) 282 (R) Superalloy: In-Situ High-Energy SAXS/WAXS Investigation

The aim of this work is to characterise precipitation kinetics in Haynes® 282® superalloy using high-energy Small Angle X-ray Scattering (SAXS) together with Wide Angle X-ray Scattering (WAXS). The phases identified by WAXS include: γ (matrix), γ' (hardening precipitates), MC (metallic carbides), and M23C6 /M6C (secondary metallic carbides). The γ'-precipitates are spheroids with a diameter of several nanometres, depending on temperature and aging time. From the SAXS data quantitative parameters such as volume fraction, number density and inter-particle distance were determined and correlated with Vickers microhardness measurements performed ex situ. The strengthening components associated with precipitates and solid solutions were separated using the measured Vickers microhardness and SAXS model parameters. A power law dependence between strengthening attributable to the precipitates and the product of volume fraction and mean precipitate radius was found. The solid solution strengthening component was found to be correlated with the repulsion/diffusion zone width around the precipitates.
Authors:
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Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 711
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Swedish Foundation for Strategic Research (SSF)
Country of Publication:
United States
Language:
English
Subject:
characterization; hardness; nickel alloys; saxs; waxs; x-ray analysis
OSTI Identifier:
1461548