Hot Deformation Behavior of a New Nuclear Use Reduced Activation Ferritic/Martensitic Steel

doi:10.1007/s40195-018-0851-0

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (7): 825-834.DOI: 10.1007/s40195-018-0851-0

所属专题： 2019年钢铁材料专辑

收稿日期:2018-07-20 修回日期:2018-09-14 接受日期:2019-11-23 出版日期:2018-11-23 发布日期:2019-06-20

Hot Deformation Behavior of a New Nuclear Use Reduced Activation Ferritic/Martensitic Steel

Chao Liu¹, Ming-Chun Zhao¹, Tuguldur Unenbayar¹, Ying-Chao Zhao¹(), Bin Xie¹, Yan Tian¹, Yi-Yin Shan², Ke Yang²

1. School of Material Science and Engineering, Central South University, Changsha 410083, China
2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2018-07-20 Revised:2018-09-14 Accepted:2019-11-23 Online:2018-11-23 Published:2019-06-20

摘要/Abstract

关键词: Reduced activation ferritic/martensitic steel, Hot deformation, Flow curve, Constitutive equation, Processing map

Abstract:

The hot deformation behavior and workability of a new reduced activation ferritic/martensitic steel named SIMP steel for accelerator-driven system were studied. The flow curve and its microstructure were studied at 900-1200 °C and strain rate range of 0.001-10 s^-1. The results showed that the deformation behavior of the SIMP steel during hot compression could be manifested by the Zener-Hollomon parameter in an exponent-type equation. Based on the obtained constitutive equation, the calculated flow stresses were in agreement with the experimentally measured ones, and the average activity energies Q_DRV and Q_HW for the initiation of dynamic recrystallization and the peak strain were calculated to be 476.1 kJ/mol and 462.7 kJ/mol, respectively. Furthermore, based on the processing maps and microstructure evolution, the optimum processing condition for the SIMP steel was determined to be 1050-1200 °C/0.001-0.1 s^-1.

Key words: Reduced activation ferritic/martensitic steel, Hot deformation, Flow curve, Constitutive equation, Processing map

. [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 825-834.

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.

图/表 13

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

Fig. 1 Complete experimental procedures for hot deformation of SIMP steel

Fig.2 True stress-strain curves of the SIMP steel deformed at 900 °C a, 1000 °C b, 1050 °C c, 1100 °C d, 1200 °C e

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. 4 Strain hardening rate plots for SIMP steel (σc: critical stress)

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

Fig. 7 Linear relationship of ln[sinh(ασc)] versus (1/nRT)

Fig. 8 Linear relationship of ln[sinh(ασp)] versus (1/nRT)

Fig. 9 Curves of lnεc and lnεp versus lnZ

Fig. 10 Curves of lnσc and lnσp versus lnZ

Fig. 11 Instability and processing maps in strain range of 0.1-0.9 for SIMP steel

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Hot Deformation Behavior of a New Nuclear Use Reduced Activation Ferritic/Martensitic Steel

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