Hot Deformation Behavior, Dynamic Recrystallization and Phase Transformation Mechanism of Zr-Nb Alloy During Compression Processing
Source abstract
Abstract
To reveal the high-temperature hot deformation mechanism and optimize the thermal processing window of Zr-Nb alloy, hot compression tests were implemented via a thermal simulation apparatus over temperatures ranging from 500 to 900 °C and strain rates of 0.01~10 s−1. The material’s flow performance, dynamic recrystallization (DRX) and phase transformation were systematically explored in this work. The results indicate that flow stress presents a negative correlation with deformation temperature and a positive correlation with strain rate. On the basis of measured stress–strain curves, the Arrhenius constitutive equation and processing map were established to quantitatively describe the alloy’s hot deformation behavior. Flow instability areas are mainly distributed in the low-temperature domain and the high strain rate region of medium-high temperature zones. The evolution of DRX under different strain rates and microstructural variations during phase transformation was analyzed in detail. Elevated strain rate leads to gradual grain refinement. Continuous dynamic recrystallization (CDRX) acts as the predominant DRX mode for Zr-Nb alloy, with merely minor discontinuous dynamic recrystallization (DDRX) features observed in the microstructure.
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Research context
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Affiliations
Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
School of Nuclear Science and Technology, University of South China, Hengyang City 421009, China
Funding
National Science and Technology Major Project for Advanced Materials
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