Solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy

Journal Article · Thu Nov 15 04:00:00 EST 2012 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2012.07.018· OSTI ID:22163144

Wu, Kai ^[1]; Liu, Guoquan ^[1]; Hu, Benfu ^[1]; Li, Feng ^[2]; Zhang, Yiwen ^[3]; Tao, Yu; Liu, Jiantao ^[4]

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1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
2. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ (United Kingdom)
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
4. High Temperature Materials Research Institution, CISRI, Beijing 100081 (China)

The solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy prepared by plasma rotating electrode process was investigated by means of optical microscope, scanning electron microscope, and transmission electron microscope. The results show that the solidification microstructure changes from dendrites to cellular and microcrystal structures with decreasing powder size. The elements of Co, Cr, W and Ni are enriched in the dendrites, while Mo, Nb and Ti are higher in the interdendritic regions. The relationships between powder size with the average solid-liquid interface moving rate, the average interface temperature gradient and the average cooling rate are established. Microsegregation is increased with larger powder size. The geometric integrity of MC Prime type carbides in the powders changes from regular to diverse with decreasing powder size. The morphology and quantity of carbides depend on the thermal parameters and non-equilibrium solute partition coefficients during rapid solidification. - Highlights: Black-Right-Pointing-Pointer The relations of solidification thermal parameters with powder size are established. Black-Right-Pointing-Pointer The relation of non-equilibrium solute partition with powder size is investigated. Black-Right-Pointing-Pointer The solidification microstructure is related to thermal parameters. Black-Right-Pointing-Pointer The segregation behavior is linked to non-equilibrium partition coefficients. Black-Right-Pointing-Pointer The morphology and quantity of carbides depend on the above combined factors.

• OSTI ID: 22163144
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: Complete Vol. 73; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBIDES
DENDRITES
EQUILIBRIUM
INTERFACES
MICROSTRUCTURE
OPTICAL MICROSCOPES
PARTITION
POWDERS
SCANNING ELECTRON MICROSCOPY
SEGREGATION
SOLIDIFICATION
SOLUTES
TEMPERATURE GRADIENTS
TRANSMISSION ELECTRON MICROSCOPY