期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 497, 期 1-2, 页码 479-486出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.07.046
关键词
Superalloy 718; High temperature deformation; Dynamic recrystallization; Nucleation
Flow behavior and microstructures of superalloy 718 were investigated by hot compression tests performed at temperatures ranging from 950 to 1100 degrees C with strain rates of 10(-3) to l s(-1). The dependence of the peak stress on deformation temperature and strain rate can be expressed by a hyperbolic-sine type equation, The activation energy for superalloy 718 is determined to be 443.2 kJ mol(-1). A power exponent relationship between the peak strain and the Z parameter is obtained. Microstructure analysis shows that the dynamically recrystallized grain size is inversely proportional to the Z parameter. The nucleation mechanisms of DRX are closely related to the value of Z parameter. Under low Z conditions, DRX nucleation and development are mainly assisted by the formation of twins near the original grain boundaries. (C) 2008 Elsevier B.V. All rights reserved.
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