Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior of 17Cr2Ni2MoVNb and 20Cr2Ni4A gear steels

Authors： Dong Mingzhen1 2 Yan Yongming2 Ouyang Xuemei1 Yuan Wufeng3 Yang Renqi3 Yang Shaopeng2 4

Unit： 1.College of Materials Science and Engineering Xiangtan University 2.Institute of Special Steels Central Iron and Steel Research Institute 3.Jianglu Electromechanical Group Co. Ltd. 4.Technology Center Maanshan Iron and Steel Co. Ltd.

KeyWords： gear steel high temperature deformation hot deformation activation energy Zener-Hollomon parameter dynamic recrystalization

ClassificationCode：TG142

year,vol(issue):pagenumber：2022,47(9):230-237

Abstract：

The thermal deformation behavior of 17Cr2Ni2MoVNb and 20Cr2Ni4A gear steels were studied by Gleeble-3800 thermal simulation test machine, respectively, and the thermal deformation activation energy for the two kinds of gear steels was calculated to construct the constitutive equation by the work hardening curves. The results show that the two kinds of gear steels exhibit obvious dynamic recrystallization at low strain rate, while at high strain rate, 20Cr2Ni4A steel exhibits dynamic recovery at 1000 ℃ and 17Cr2Ni2MoVNb steel exhibits dynamic recovery at 1000-1150 ℃. Under the same deformation conditions, the peak stress and critical stress of 17Cr2Ni2MoVNb steel are higher than those of 20Cr2Ni4A steel, and the thermal deformation activation energy of 17Cr2Ni2MoVNb and 20Cr2Ni4A steels are 374 and 324 kJ·mol-1, respectively. The difference between the stress characteristic values and the thermal deformation activation energy between the two kinds of gear steels is mainly due to the different contents of Ni, Mo and Nb, which have different effects on dynamic recrystallization. At low strain rate, the optional deformation temperature for the two kinds of gear steels is the same, while at high strain rate, the processing temperature of 17Cr2Ni2MoVNb steel can be selected to be more than 100 ℃ higher than that of 20Cr2Ni4A steel.

Funds：

国家重点专项（20T60860B）

董明振（1996-），男，硕士研究生 E-mail：dongmz0126@163.com 通信作者：闫永明（1986-），男，博士，高级工程师 E-mail：yanyongming@nercast.com

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