Influence of High Temperature Annealing on Microstructure Evolution of Ni-24Fe-14Cr-8Mo Superalloy

Abstract:

The effect of high temperature annealing on microstructure evolution of Ni-24Fe-14Cr-8Mo alloy was investigated through Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Rockwell Hardness Testing Machine. Three kinds of grain growth patterns were found at different annealing temperatures due to carbides precipitation and dissolution. After a combination of high temperature annealing and aging treatment, the hardness versus time curves performed a parabolic pattern. The highest hardness was achieved under 1070°C/60 minutes treatment, and the desirable annealing time should be 60 minutes to 90 minutes.

• Periodical: Key Engineering Materials (Volume 904)
• Pages: 117-123
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.904.117
• Online since: November 2021
• Authors: Yi Cui*, Yun Fei Zhang, Yan Guang Han, Da Lv
• Keywords: Hardness Evolution, Heat Treatment, Microstructure Evolution, Precipitation, Superalloy

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