Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (7): 825-834.DOI: 10.1007/s40195-018-0851-0
Special Issue: 2019年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Chao Liu1, Ming-Chun Zhao1, Tuguldur Unenbayar1, Ying-Chao Zhao1(), Bin Xie1, Yan Tian1, Yi-Yin Shan2, Ke Yang2
Received:
2018-07-20
Revised:
2018-09-14
Accepted:
2019-11-23
Online:
2018-11-23
Published:
2019-06-20
Chao Liu, Ming-Chun Zhao, Tugudur Unenbayar, Ying-Chao Zhao, Bin Xie, Yan Tian, Yi-Yin Shan, Ke Yang. Hot Deformation Behavior of a New Nuclear Use Reduced Activation Ferritic/Martensitic Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 825-834.
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C | Si | Cr | Mn | W | Ta | V | Nb | S | P |
---|---|---|---|---|---|---|---|---|---|
0.22 | 1.22 | 10.24 | 0.52 | 1.45 | 0.12 | 0.18 | 0.01 | 0.0043 | 0.0040 |
Table 1 Chemical compositions of experimental SIMP steel (wt%)
C | Si | Cr | Mn | W | Ta | V | Nb | S | P |
---|---|---|---|---|---|---|---|---|---|
0.22 | 1.22 | 10.24 | 0.52 | 1.45 | 0.12 | 0.18 | 0.01 | 0.0043 | 0.0040 |
Temperature (°C) | r 2 | r 3 | r 4 | r 5 |
---|---|---|---|---|
900 | 0.25 | 0.70 | 1.00 | 1.13 |
1000 | 0.67 | 1.15 | 1.81 | 2.50 |
1050 | 0.92 | 1.36 | 2.78 | 3.38 |
1100 | - | 1.03 | 2.80 | 3.40 |
1200 | 0.97 | 2.04 | 3.28 | 4.43 |
Table 2 Maximum stress augmentation ratio at different deformation temperatures
Temperature (°C) | r 2 | r 3 | r 4 | r 5 |
---|---|---|---|---|
900 | 0.25 | 0.70 | 1.00 | 1.13 |
1000 | 0.67 | 1.15 | 1.81 | 2.50 |
1050 | 0.92 | 1.36 | 2.78 | 3.38 |
1100 | - | 1.03 | 2.80 | 3.40 |
1200 | 0.97 | 2.04 | 3.28 | 4.43 |
Fig.3 Microstructures of SIMP steel deformed at a 900 °C, 0.1 s-1, b 1000 °C, 0.1 s-1, c 1100 °C, 0.1 s-1, d 1200 °C, 0.1 s-1, e 900 °C, 10 s-1, f 1000 °C, 10 s-1, g 1100 °C, 10 s-1, h 1200 °C, 10 s-1
Fig. 5 Flow stress dependence of $- \partial \theta /\partial \sigma$ for SIMP steel (The inset shows the minimum point of the second numerical derivative of flow curves as a function of stress at the inflection point of work hardening curve. This unique minimum point gives a good estimate of the critical stress)
Fig. 6 Plots of $\ln \dot{\varepsilon } - \ln \sigma_{\text{c}}$ and $\ln \dot{\varepsilon } - \ln [\sinh (\alpha \sigma_{\text{c}} )] $for calculation of hot working constants for SIMP steel
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