Effect of Rotation Rate on Microstructure and Mechanical Properties of Friction Stir Processed Ni–Fe-Based Superalloy

In this work, friction stir processing (FSP) was applied to the high-strength and high-melting-point Ni–Fe-based superalloy (HT700) for the first time with negligible wear of the stir tool. Different rotation rates were chosen to investigate the effect of heat input on microstructure and tensile pro...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2021-10, Vol.34 (10), p.1407-1420
Main Authors: Wang, Miao, Huang, Xing-Wei, Xue, Peng, Cui, Chuan-Yong, Zhang, Qing-Chuan
Format: Article
Language:English
Subjects:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Dynamic recrystallization
Ferrous alloys
Fractures
Friction stir processing
Friction stir welding
Geometry
Grain boundaries
Grain refinement
Grain size
Iron
Materials Science
Mechanical properties
Melting points
Metallic Materials
Microstructure
Nanotechnology
Nickel base alloys
Organometallic Chemistry
Rotation
Spectroscopy/Spectrometry
Superalloys
Temperature
Tensile properties
Tribology
Twin boundaries
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Summary:In this work, friction stir processing (FSP) was applied to the high-strength and high-melting-point Ni–Fe-based superalloy (HT700) for the first time with negligible wear of the stir tool. Different rotation rates were chosen to investigate the effect of heat input on microstructure and tensile properties at different temperatures of friction stir processed Ni–Fe-based superalloy. The results showed that with increasing rotation rate, the percentage of high-angle grain boundaries and twin boundaries gradually decreased whereas the grain size initially increased and then remained almost constant; the difference in tensile properties of FSP samples with rotation rates of 500–700 rpm was small attributing to their similar grain size, but the maximum strength was achieved in the FSP sample with a rotation rate of 400 rpm and traverse speed of 50 mm/min due to its finest grain size. More importantly, we found that the yield strength of all FSP samples tensioned at 700 °C was enhanced clearly resulting from the reprecipitation of γ′ phase. In addition, the grain refinement mechanism of HT700 alloy during FSP was proved to be continuous dynamic recrystallization and the specific refinement process was given.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-021-01240-2