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

Abstract

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 abovemore » combined factors.« less

Authors:
 [1];  [1];  [2];  [1];  [3];  [4];  [2]; ;  [5]
  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
  2. (China)
  3. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ (United Kingdom)
  4. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
  5. High Temperature Materials Research Institution, CISRI, Beijing 100081 (China)
Publication Date:
OSTI Identifier:
22163144
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 73; Journal Issue: Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBIDES; DENDRITES; EQUILIBRIUM; INTERFACES; MICROSTRUCTURE; OPTICAL MICROSCOPES; PARTITION; POWDERS; SCANNING ELECTRON MICROSCOPY; SEGREGATION; SOLIDIFICATION; SOLUTES; TEMPERATURE GRADIENTS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Wu, Kai, E-mail: wk-ustb@163.com, Liu, Guoquan, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, Hu, Benfu, Li, Feng, Zhang, Yiwen, High Temperature Materials Research Institution, CISRI, Beijing 100081, Tao, Yu, and Liu, Jiantao. Solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.07.018.
Wu, Kai, E-mail: wk-ustb@163.com, Liu, Guoquan, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, Hu, Benfu, Li, Feng, Zhang, Yiwen, High Temperature Materials Research Institution, CISRI, Beijing 100081, Tao, Yu, & Liu, Jiantao. Solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy. United States. doi:10.1016/J.MATCHAR.2012.07.018.
Wu, Kai, E-mail: wk-ustb@163.com, Liu, Guoquan, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, Hu, Benfu, Li, Feng, Zhang, Yiwen, High Temperature Materials Research Institution, CISRI, Beijing 100081, Tao, Yu, and Liu, Jiantao. Thu . "Solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy". United States. doi:10.1016/J.MATCHAR.2012.07.018.
@article{osti_22163144,
title = {Solidification characterization of a new rapidly solidified Ni-Cr-Co based superalloy},
author = {Wu, Kai, E-mail: wk-ustb@163.com and Liu, Guoquan and State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083 and Hu, Benfu and Li, Feng and Zhang, Yiwen and High Temperature Materials Research Institution, CISRI, Beijing 100081 and Tao, Yu and Liu, Jiantao},
abstractNote = {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.},
doi = {10.1016/J.MATCHAR.2012.07.018},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 73,
place = {United States},
year = {2012},
month = {11}
}