Correlation of precipitate evolution with Vickers hardness in Haynes® 282® superalloy: In-situ high-energy SAXS/WAXS investigation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:711

Article

Haas, Sylvio¹  Andersson, Joel²  Fisk, Martin^3,4  Park, Jun-Sang⁵  Lienert, Ulrich¹ 

[1] DESY, Photon Sci, Hamburg, Germany

[2] Univ West, Dept Engn Sci, Trollhattan, Sweden

[3] Malmo Univ, Mat Sci & Appl Math, Malmo, Sweden

[4] Lund Univ, Div Solid Mech, POB 118, SE-22100 Lund, Sweden

[5] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

关键词: X-ray analysis;    Characterization;    Hardness;    Nickel alloys;    SAXS;    WAXS;   

DOI  :  10.1016/j.msea.2017.11.035

来源: Elsevier

【 摘 要 】

The aim of this work is to characterize the precipitation kinetics in Haynes (R) 282 (R) superalloys using in-situ high-energy Small Angle X-ray Scattering (SAXS) together with Wide Angle X-ray Scattering (WAXS). The phases identified by WAXS include gamma (matrix), gamma' (hardening precipitates), MC (metallic carbides), and M23C6/M6C (secondary metallic carbides). The gamma'-precipitates are spheroids with a diameter of several nanometres, depending on the temperature and ageing time. From the SAXS data, quantitative parameters such as volume fraction, number density and inter-particle distance were determined and correlated with ex-situ Vickers microhardness measurements. The strengthening components associated with precipitates and solid solutions are differentiated using the measured Vickers microhardness and SAXS model parameters. A square root dependence between strengthening attributable to the precipitates and the product of volume fraction and mean precipitate radius is found. The solid solution strengthening component correlates with the total volume fraction of precipitates.

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