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Title: Thermal evolution behavior of carbides and {gamma} Prime precipitates in FGH96 superalloy powder

Abstract

The characteristics of rapidly solidified FGH96 superalloy powder and the thermal evolution behavior of carbides and {gamma} Prime precipitates within powder particles were investigated. It was observed that the reduction of powder size and the increase of cooling rate had transformed the solidification morphologies of atomized powder from dendrite in major to cellular structure. The secondary dendritic spacing was measured to be 1.02-2.55 {mu}m and the corresponding cooling rates were estimated to be in the range of 1.4 Multiplication-Sign 10{sup 4}-4.7 Multiplication-Sign 10{sup 5} K{center_dot}s{sup -1}. An increase in the annealing temperature had rendered the phase transformation of carbides evolving from non-equilibrium MC Prime carbides to intermediate transition stage of M{sub 23}C{sub 6} carbides, and finally to thermodynamically stable MC carbides. The superfine {gamma} Prime precipitates were formed at the dendritic boundaries of rapidly solidified superalloy powder. The coalescence, growth, and homogenization of {gamma}' precipitates occurred with increasing annealing temperature. With decreasing cooling rate from 650 Degree-Sign C{center_dot}K{sup -1} to 5 Degree-Sign C{center_dot}K{sup -1}, the morphological development of {gamma} Prime precipitates had been shown to proceed from spheroidal to cuboidal and finally to solid state dendrites. Meanwhile, a shift had been observed from dendritic morphology to recrystallized structure between 900more » Degree-Sign C and 1050 Degree-Sign C. Moreover, accelerated evolution of carbides and {gamma}' precipitates had been facilitated by the formation of new grain boundaries which provide fast diffusion path for atomic elements. - Highlights: Black-Right-Pointing-Pointer Microstructural characteristic of FGH96 superalloy powder was investigated. Black-Right-Pointing-Pointer The relation between microstructure, particle size, and cooling rate was studied. Black-Right-Pointing-Pointer Thermal evolution behavior of {gamma} Prime and carbides in loose FGH96 powder was studied.« less

Authors:
 [1]
  1. State Key Laboratory for Advanced Metals and Materials, Beijing Key Laboratory for Powder Metallurgy and Particulate Materials, University of Science and Technology Beijing, Beijing, 100083 (China)
Publication Date:
OSTI Identifier:
22066447
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 67; 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; ANNEALING; CARBIDES; COALESCENCE; DENDRITES; DIFFUSION; GRAIN BOUNDARIES; GRAIN GROWTH; HEAT RESISTING ALLOYS; MORPHOLOGY; NICKEL BASE ALLOYS; PARTICLE SIZE; PARTICLES; POWDER METALLURGY; POWDERS; PRECIPITATION; SOLIDIFICATION; SOLIDS

Citation Formats

Zhang Lin, E-mail: zhanglincsu@163.com, Liu Hengsan, E-mail: lhsj63@sohu.com, He Xinbo, E-mail: xb_he@163.com, Rafi-ud-din,, Qu Xuanhui, E-mail: quxh@ustb.edu.cn, Qin Mingli, E-mail: mlqin75@hotmail.com, Li Zhou, E-mail: zhouli621@126.com, and Zhang Guoqing, E-mail: g.zhang@126.com. Thermal evolution behavior of carbides and {gamma} Prime precipitates in FGH96 superalloy powder. United States: N. p., 2012. Web. doi:10.1016/J.MATCHAR.2012.02.014.
Zhang Lin, E-mail: zhanglincsu@163.com, Liu Hengsan, E-mail: lhsj63@sohu.com, He Xinbo, E-mail: xb_he@163.com, Rafi-ud-din,, Qu Xuanhui, E-mail: quxh@ustb.edu.cn, Qin Mingli, E-mail: mlqin75@hotmail.com, Li Zhou, E-mail: zhouli621@126.com, & Zhang Guoqing, E-mail: g.zhang@126.com. Thermal evolution behavior of carbides and {gamma} Prime precipitates in FGH96 superalloy powder. United States. doi:10.1016/J.MATCHAR.2012.02.014.
Zhang Lin, E-mail: zhanglincsu@163.com, Liu Hengsan, E-mail: lhsj63@sohu.com, He Xinbo, E-mail: xb_he@163.com, Rafi-ud-din,, Qu Xuanhui, E-mail: quxh@ustb.edu.cn, Qin Mingli, E-mail: mlqin75@hotmail.com, Li Zhou, E-mail: zhouli621@126.com, and Zhang Guoqing, E-mail: g.zhang@126.com. Tue . "Thermal evolution behavior of carbides and {gamma} Prime precipitates in FGH96 superalloy powder". United States. doi:10.1016/J.MATCHAR.2012.02.014.
@article{osti_22066447,
title = {Thermal evolution behavior of carbides and {gamma} Prime precipitates in FGH96 superalloy powder},
author = {Zhang Lin, E-mail: zhanglincsu@163.com and Liu Hengsan, E-mail: lhsj63@sohu.com and He Xinbo, E-mail: xb_he@163.com and Rafi-ud-din, and Qu Xuanhui, E-mail: quxh@ustb.edu.cn and Qin Mingli, E-mail: mlqin75@hotmail.com and Li Zhou, E-mail: zhouli621@126.com and Zhang Guoqing, E-mail: g.zhang@126.com},
abstractNote = {The characteristics of rapidly solidified FGH96 superalloy powder and the thermal evolution behavior of carbides and {gamma} Prime precipitates within powder particles were investigated. It was observed that the reduction of powder size and the increase of cooling rate had transformed the solidification morphologies of atomized powder from dendrite in major to cellular structure. The secondary dendritic spacing was measured to be 1.02-2.55 {mu}m and the corresponding cooling rates were estimated to be in the range of 1.4 Multiplication-Sign 10{sup 4}-4.7 Multiplication-Sign 10{sup 5} K{center_dot}s{sup -1}. An increase in the annealing temperature had rendered the phase transformation of carbides evolving from non-equilibrium MC Prime carbides to intermediate transition stage of M{sub 23}C{sub 6} carbides, and finally to thermodynamically stable MC carbides. The superfine {gamma} Prime precipitates were formed at the dendritic boundaries of rapidly solidified superalloy powder. The coalescence, growth, and homogenization of {gamma}' precipitates occurred with increasing annealing temperature. With decreasing cooling rate from 650 Degree-Sign C{center_dot}K{sup -1} to 5 Degree-Sign C{center_dot}K{sup -1}, the morphological development of {gamma} Prime precipitates had been shown to proceed from spheroidal to cuboidal and finally to solid state dendrites. Meanwhile, a shift had been observed from dendritic morphology to recrystallized structure between 900 Degree-Sign C and 1050 Degree-Sign C. Moreover, accelerated evolution of carbides and {gamma}' precipitates had been facilitated by the formation of new grain boundaries which provide fast diffusion path for atomic elements. - Highlights: Black-Right-Pointing-Pointer Microstructural characteristic of FGH96 superalloy powder was investigated. Black-Right-Pointing-Pointer The relation between microstructure, particle size, and cooling rate was studied. Black-Right-Pointing-Pointer Thermal evolution behavior of {gamma} Prime and carbides in loose FGH96 powder was studied.},
doi = {10.1016/J.MATCHAR.2012.02.014},
journal = {Materials Characterization},
issn = {1044-5803},
number = Complete,
volume = 67,
place = {United States},
year = {2012},
month = {5}
}