Dynamic recrystallization behavior of Fe–20Cr–30Ni–0.6Nb–2Al–Mo alloy
来源期刊：Rare Metals2019年第2期
论文作者：Rui Luo Qi Zheng Jing-Jing Zhu Shun Guo Dong-Sheng Li Gui-Fang Xu Xiao-Nong Cheng
文章页码：181 - 188
摘 要：Single-pass compression tests of an aluminaforming austenite（AFA） alloy（Fe–20Cr–30Ni–0.6Nb–2Al–Mo） were performed using a Gleeble-3500 thermal–mechanical simulator. By combining techniques of electron back-scattered diffraction（EBSD） and transmission electron microscopy（TEM）, the dynamic recrystallization（DRX） behavior of the alloy at temperatures of 950–1100 ℃ and strain rates of 0.01–1.00 s-1 was investigated. The regression method was adopted to determine the thermal deformation activation energy and apparent stress index and to construct a thermal deformation constitutive model. Results reveal that the flow stress is strongly dependent on temperature and strain rate and it increases with temperature decreasing and strain rate increasing. The DRX phenomenon occurs more easily at comparably higher deformation temperatures and lower strain rates. Based on the method for solving the inflection point via cubic polynomial fitting of strain hardening rate（h） versus strain（e） curves, the ratio of critical strain（ec） to peak strain（ep） during DRX was precisely predicted. The nucleation mechanisms of DRX during thermal deformation mainly include the strain-induced grain boundary（GB）migration, grain fragmentation, and subgrain coalescence.
Rui Luo，Qi Zheng，Jing-Jing Zhu，Shun Guo，Dong-Sheng Li，Gui-Fang Xu，Xiao-Nong Cheng
School of Materials Science and Engineering, Jiangsu University
摘 要：Single-pass compression tests of an aluminaforming austenite（AFA） alloy（Fe–20Cr–30Ni–0.6Nb–2Al–Mo） were performed using a Gleeble-3500 thermal–mechanical simulator. By combining techniques of electron back-scattered diffraction（EBSD） and transmission electron microscopy（TEM）, the dynamic recrystallization（DRX） behavior of the alloy at temperatures of 950–1100 ℃ and strain rates of 0.01–1.00 s-1 was investigated. The regression method was adopted to determine the thermal deformation activation energy and apparent stress index and to construct a thermal deformation constitutive model. Results reveal that the flow stress is strongly dependent on temperature and strain rate and it increases with temperature decreasing and strain rate increasing. The DRX phenomenon occurs more easily at comparably higher deformation temperatures and lower strain rates. Based on the method for solving the inflection point via cubic polynomial fitting of strain hardening rate（h） versus strain（e） curves, the ratio of critical strain（ec） to peak strain（ep） during DRX was precisely predicted. The nucleation mechanisms of DRX during thermal deformation mainly include the strain-induced grain boundary（GB）migration, grain fragmentation, and subgrain coalescence.
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