Journal
RARE METALS
Volume 41, Issue 8, Pages 2759-2766Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-015-0602-6
Keywords
IN718; Microstructural evolution; Flow behavior; Constitutive equations; Internal state variables
Funding
- National Natural Science Foundation of China [51375042]
- Fund of Beijing Laboratory of Modern Transport Metal Materials and Processing Technology
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Hot deformation behavior and microstructural evolution of IN718 were investigated in this study by performing hot compression tests and developing a set of viscoplastic constitutive equations. The experimental results indicate that these constitutive equations accurately describe the hot deformation behavior and microstructural evolution of IN718.
Microstructural evolution and flow behavior greatly affect the hot forming process of IN718. In this research, hot deformation behaviors of IN718 were investigated by performing hot compression tests at temperature range of 1000-1100 degrees C with strain rates of 0.1-20.0 s(-1). By incorporating physically based internal state variables such as dislocation density, volume fraction of dynamic recrystallization, and grain size, a set of unified viscoplastic constitutive equations were developed to predict the microstructural evolution and flow behavior of IN718. The material constants were determined using a genetic algorithm (GA)-based optimization method. Comparisons of the computed and experimental results indicate that the constitutive equations established in this study can accurately describe the hot deformation behavior and microstructural evolution of IN718.
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