Dynamic recrystallization behavior of 35CrMo structural steel |
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| Authors: | Zhang Bin Zhang Hong-bing and Ruan Xue-yu |
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| Affiliation: | (1) Department of Plasticity Forming Engineering, Shanghai Jiaotong University, 200030 Shanghai, China;(2) Department of Materials Engineering, Institute of Shanghai Technology, 20035 Shanghai, China |
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| Abstract: | The dynamic recrystallization behavior of 35CrMo steel was studied with compression test in the temperature range of 1 223–1
423 K and the strain rate range of 0.01–10.00 s−1. The initiation and evolution of dynamic recrystallization were investigated with microstructure analysis and then the critical
strain ɛ
c
for dynamic recrystallization initiation, the strain for maximum softening rate ɛ* and the steady strain ɛs were obtained to be 2.92×10−3
Z
0.1381, 1.60 × 10−3
Z
0.1780 and 3.26 × 10−2 × Z
0.0972 respectively by analysis of work-hardening rate-strain θ-ɛ curves, where Z is the Zener-Hollomon parameter. The dynamic recrystallization fraction was determined using recrystallization
theory, and the effects of initial grain size, strain rate and deformated temperature on the dynamic recrystallization kinetics
were investigated. The results show:
, the dynamic recrystallization fraction is slightly delayed due to the somewhat larger initial grain size and markedly delayed
with the decrease of temperature. On the other hand, it is significantly accelerated with the increase of the strain rate.
Finally, the relationships between the initiation time, ending time of dynamic recrystallization and the deformed temperature
were analyzed in detail.
Foundation item: The National Natural Science Foundation of China (No. 50075053)
Biography of the first author: ZHANG Bin, doctoral student, born in 1972, majoring in materials science and engineering. |
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| Keywords: | dynamic recrystallization θ -ɛ curve recrystallization kinetics initial grain size |
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