Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (4): 526-534.DOI: 10.1007/s40195-018-0783-8
Special Issue: 2019年钢铁材料专辑
• Orginal Article • Previous Articles Next Articles
Yu-Cheng Zhang1(
), Zhen-Sheng Meng1, Yang Meng1, Xin-Hua Ju1, Zhong-Hang Jiang1, Ze-Jun Ma1
Received:2018-03-12
Revised:2018-04-27
Online:2019-04-10
Published:2019-04-19
Contact:
Zhang Yu-Cheng
About author: Dr. Kun-Kun Deng was born in 1983 and was awarded Ph. D in Harbin University of Technology in 2011. After graduation, he worked in the College of Materials Science and Engineering, Taiyuan University of Technology. At the same time, he continued his research work on the design, fabrication and processing of advanced Mg-based material in. Now, he is the vice chairman of Youth Committee in Magnesium Alloy Branch of Chinese Materials Research Society. He was denoted as young academic pacemaker of Shanxi Province in 2018. He has held two projects of National Nature Science Foundation of China, one project of Specialized Research Fund for the Doctoral Program of Higher Education, one Project of International Cooperation in Shanxi and two projects of Natural Science Foundation of Shanxi. He has published more than 60 articles. The time cited is more than 840 (without selfcitations), and the H-index is 22. In addition, he has published one academic monograph and acquired eight Chinese patents. 
Yu-Cheng Zhang, Zhen-Sheng Meng, Yang Meng, Xin-Hua Ju, Zhong-Hang Jiang, Ze-Jun Ma. Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(4): 526-534.
| Steels | C | Si | Mn | P | S | Ni | Al | Mo?+?V+Ti | Nb |
|---|---|---|---|---|---|---|---|---|---|
| Nb-free | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.009 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0 |
| Low Nb | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.009 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0.01-0.02 |
| Medium Nb | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.009 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0.03-0.04 |
| High Nb | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.010 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0.05-0.06 |
Table 1 Chemical composition of S460ML steel (mass fraction, %)
| Steels | C | Si | Mn | P | S | Ni | Al | Mo?+?V+Ti | Nb |
|---|---|---|---|---|---|---|---|---|---|
| Nb-free | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.009 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0 |
| Low Nb | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.009 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0.01-0.02 |
| Medium Nb | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.009 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0.03-0.04 |
| High Nb | 0.03-0.04 | 0.2-0.25 | 1.4-1.6 | 0.010 | 0.003 | 0.4-0.6 | <?0.03 | <?0.20 | 0.05-0.06 |
Fig. 1 True stress-strain curves of Nb-free steel at different conditions: a 0.1 s-1, b 0.5 s-1, c 1.0 s-1, d 3.5 s-1, e 5.0 s-1
Fig. 2 Experimental conditions for generating dynamic recrystallization for the steels with different Nb contents
Fig. 3 True stress-strain curve of Nb-free steel at strain rate of 0.1 s-1 and 1200 °C
Fig. 4 Curves of θ versus σa and dθ/dσ versus σb of Nb-free steel at 1200 °C with 0.1 s-1
Fig. 5 Metallographic morphologies of austenite grain of Nb-free steel under different strains: a 0.08, b 0.11, c 0.13, d 0.15, e 0.20, f 0.30
Fig. 6 Variation curves of critical strain for dynamic recrystallization with deformation temperature at strain rate of 0.1 s-1
Fig. 7 Variation curves of critical strain for dynamic recrystallization with strain rate at 1200 °C
Fig. 8 Relationship between peak stress and strain rate a, deformation temperature b for Nb-free steel
Fig. 9 Relationship between lnεc and lnZ for Nb-free steel
Fig. 10 Relationship between critical strain εc and peak strain εp for Nb-free steel
| Steels | Z parameter model | Peak strain model |
|---|---|---|
| Nb-free | \(\varepsilon_{\text{c}} = 4.78 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{34767}{T}} \right)^{0.165}\) | \(\varepsilon_{\text{c}} \approx 0.73\varepsilon_{\text{p}}\) |
| Low Nb | \(\varepsilon_{\text{c}} = 2.98 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{35194}{T}} \right)^{0.178}\) | \(\varepsilon_{\text{c}} \approx 0.74\varepsilon_{\text{p}}\) |
| Medium Nb | \(\varepsilon_{\text{c}} = 1.74 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{35893}{T}} \right)^{0.198}\) | \(\varepsilon_{\text{c}} \approx 0.73\varepsilon_{\text{p}}\) |
| High Nb | \(\varepsilon_{\text{c}} = 8.53 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{41847}{T}} \right)^{0.115}\) | \(\varepsilon_{\text{c}} \approx 0.8\varepsilon_{\text{p}}\) |
Table 2 Mathematical model for predicting critical strain of dynamic recrystallization for steels with different Nb contents
| Steels | Z parameter model | Peak strain model |
|---|---|---|
| Nb-free | \(\varepsilon_{\text{c}} = 4.78 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{34767}{T}} \right)^{0.165}\) | \(\varepsilon_{\text{c}} \approx 0.73\varepsilon_{\text{p}}\) |
| Low Nb | \(\varepsilon_{\text{c}} = 2.98 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{35194}{T}} \right)^{0.178}\) | \(\varepsilon_{\text{c}} \approx 0.74\varepsilon_{\text{p}}\) |
| Medium Nb | \(\varepsilon_{\text{c}} = 1.74 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{35893}{T}} \right)^{0.198}\) | \(\varepsilon_{\text{c}} \approx 0.73\varepsilon_{\text{p}}\) |
| High Nb | \(\varepsilon_{\text{c}} = 8.53 \times 10^{ - 3} \left( {\dot{\varepsilon }\exp \frac{41847}{T}} \right)^{0.115}\) | \(\varepsilon_{\text{c}} \approx 0.8\varepsilon_{\text{p}}\) |
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