Dynamic Recrystallization Behavior and Kinetics Model of a New Developed Austenitic Heat Resistant Steel CHDG-A

被引:0
|
作者
Cheng X. [1 ]
Gui X. [1 ]
Luo R. [1 ]
Xu G. [1 ]
Yuan Z. [1 ]
Zhou Y. [1 ]
Gao P. [1 ,2 ]
机构
[1] School of Materials Science and Engineering, Jiangsu University, Zhenjiang
[2] Jiangsu Yinhuan Precision Steel Tube Co., Ltd., Yixing
来源
Luo, Rui (luoruiweiyi@163.com) | 1600年 / Chinese Journal of Materials Research卷 / 34期
关键词
Austenitic heat resistant steel; Dynamic recrystallization; Hot compression; Metallic materials; Zener-Hollomon parameter;
D O I
10.11901/1005.3093.2019.567
中图分类号
学科分类号
摘要
The deformation behavior and microstructural evolution of a new developed austenitic heat resistant steel CHDG-A were investigated by hot compression tests with strain rate in the range of 0.01-10 s-1 at 900~1100℃. The results show that either increasing the deformation temperature or decreasing the strain rate, the flow stress level reduces remarkably. Accurate constitutive equations were established between peak stress and deformation parameters, i.e., temperature and strain rate by the regression analysis of sine hyperbolic function. The hot deformation activation energy of CHDG-A was calculated to be 515.618 kJ/mol. From the deformed microstructures it is found that dynamic recrystallization (DRX) is the principal softening mechanism during hot working. The DRX process may initiate from nucleus formed at bulging out of grain-boundaries, which can be promoted by the increase of temperature and the decrease of strain rate. The values of peak stress, critical stress, peak strain and critical strain for DRX were determined from the true strain-true stress curves and their equations related to the Zener-Hollomon parameter were obtained. The critical strain and corresponding stress for DRX can be expressed through the parameter Z. The critical ratios of ε c/ε p and σ c/σ p are also identified, which are 0.52 and 0.98, respectively. Moreover, the DRX kinetics for CHDG-A can be represented in the form of Avrami equation, and the predicted volume fraction of new grains based on the developed model agrees well with the experimental results. © 2020, Editorial Office of Chinese Journal of Materials Research. All right reserved.
引用
收藏
页码:611 / 620
页数:9
相关论文
共 30 条
  • [21] He A, Xie G, Zhang H, Et al., A modified Zerilli-Armstrong constitutive model to predict hot deformation behavior of 20CrMo alloy steel, Materials & Design, 56, 4, (2014)
  • [22] Mejia I, Bedolla-Jacuinde A, Maldonado C, Et al., Determination of the critical conditions for the initiation of dynamic recrystallization in boron microalloyed steels, Mater Sci Eng A, 528, (2011)
  • [23] Mirzadeh H, Parsa M H, Hot deformation and dynamic recrystallization of NiTi intermetallic compound, Journal of Alloys and Compounds, 614, (2014)
  • [24] Zhang C, Zhang L W, Shen W F, Et al., Study on constitutive modeling and processing maps for hot deformation of medium carbon Cr-Ni-Mo alloyed steel, Materials & Design, 90, (2016)
  • [25] Wei H L, Liu G Q, Xiao X, Et al., Recrystallization behavior of a medium carbon vanadium microalloyed steel, Materials Science and Engineering, 573
  • [26] Cao F R, Xia F, Xue G Q, 361Zn alloy, Li-Al-Materials & Design, 9, 92, (2016)
  • [27] Sarkar A, Marchattiwar A, Chakravartty J K, Et al., Kinetics of dynamic recrystallization in Ti-modified 15Cr-15Ni-2Mo austenitic stainless steel, Journal of Nuclear Material, 432, 1-3, (2013)
  • [28] Wan Z, Sun Y, Hu L, Et al., Dynamic softening behavior and microstructural characterization of TiAl-based alloy during hot deformation, Materials Characterization, 130, (2017)
  • [29] Humphreys F J, Hatherly M, Recrystallization and Related Annealing Phenomena, 98, 103, (2004)
  • [30] Mahajan S, Pande C S, Imam M A, Et al., Formation of Annealing Twins in F.c.c, Crystals. Acta Mater, 45, 6, (1997)