期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.04.004
关键词
Alloy 617; Hot deformation; Kinetic analysis; Processing map; Dynamic recrystallization; Microstructure
类别
资金
- Department of Science and Technology, Govt. of India through FIST program [SR/FST/ETII-049]
The hot deformation behavior of alloy 617 has been studied by performing hot compression in a range of temperatures (1173-1473 K) and strain rates (0.001-10 s(-1)). The peak flow stress found to increase with Zener-Hollomon parameter (Z) following a hyperbolic-sine function relationship whereas peak strain followed power-law type relationship with Z. The average activation energy for the entire hot deformation domain was estimated to be 481 kJ mol(-1). The experimental stress-strain data has been used to develop processing map employing dynamic material model. The material exhibits a wide stable domain below 0.1 s(-1) spanning over 1250-1473 K, with a peak efficiency of similar to 45%. Based on the processing map and subsequent microstructural observation, the optimum hot deformation domain of alloy 617 is identified as 1323-1423 K and 0.001-0.1 s(-1). Furthermore, microstructural observation alone has revealed that a significant DRX with grain refinement could also be obtained at high temperature (>1373 K) and high strain rate (>1 s(-1)) domain although processing map has marked this region as unstable domain. (C) 2016 Elsevier B.V. All rights reserved.
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