Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 724, Issue -, Pages 198-207Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.07.027
Keywords
Superalloy; Grain growth; Full recrystallization; Annealing twins
Categories
Funding
- National Natural Science Foundation Council of China [51375502]
- Project of Innovation-driven Plan in Central South University [2016CX008]
- National Key Basic Research Program [2013CB035801]
- Natural Science Foundation for Distinguished Young Scholars of Hunan Province [2016 JJ1017]
- Program of Chang Jiang Scholars of Ministry of Education [Q2015140]
- National Postdoctoral Program for Innovative Talents [BX201600193]
- Postdoctoral Science Foundation [2017M612579]
- Natural Science Foundation of Hunan Province [2017JJ3326]
- Scientific Research Fund of Hunan Province Education Department [17B009]
- Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle, College of Hunan Province [2016KF1603]
- Open-End Fund for the Valuable and Precision Instruments of Central South University, China [CSUZC201722]
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The grain growth behaviors of a nickel-based superalloy after full recrystallization are investigated by hot compression test plus annealing treatment. Electron backscattered diffraction technology (EBSD) is utilized to analyze the grain boundary features. It is found that the annealing parameters greatly affect the average grain size, and annealing twin boundaries, including Sigma 3, Sigma 9, and Sigma 27 boundaries. The fully-recrystallized grains can rapidly grow up at relatively high annealing temperatures with the increase of annealing time. Meanwhile, large fractions of annealing twin boundaries form at the initial stage of annealing treatment. However, with the further increase of annealing time, the content of annealing twins slightly drops due to the migration of grain boundaries or twin boundaries. When the annealing temperature is increased, the shape of annealing twin is apparently lengthened while the number of annealing twin sharply decreases. In addition, the kinetics model for grain growth after full recrystallization is established and validated by the experimental observations. (C) 2017 Elsevier B.V. All rights reserved.
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