Transactions of Materials and Heat Treatment

Title：High-temperature deformation behavior and constitutive model analysis on 8418 die steel

Authors： Chen Qi1 Li Huaying1 Zhao Ming1 Huang Fang1 Su Guanzheng1 Li Juan2 Zhao Guanghui 2

Unit： 1.School of Materials Science and Engineering Taiyuan University of Science and Technology 2.Engineering Research Center of Heavy Machinery Ministry of Education Taiyuan University of Science and Technology

KeyWords： 8418 die steel high-temperature deformation behavior constitutive model strain-compensated Arrhenius model dynamic recrystallization hot processing map

ClassificationCode：TG142

year,vol(issue):pagenumber：2025,50(7):239-247

Abstract：

In order to investigate the deformation behavior and constitutive model of 8418 die steel under high-temperature conditions, hot compression experiments were conducted by thermal simulation testing machine Gleeble-3800 with the temperature range of 950-1150 ℃, the strain rates of 0.01, 0.1, 1 and 10 s-1, and the compression ratio of 55%. The results show that as the temperature increases from 950 ℃ to 1150 ℃, the stress of 8418 die steel decreases significantly, and when the strain rate increases from 0.01 s-1 to 10 s-1, the stress value increases significantly. Based on the theological curve, the strain-compensated Arrhenius constitutive model was constructed to accurately predict the high-temperature deformation behavior of the material. According to the dynamic material model (Kumar-Prasad), a hot processing map was established, and the optimal hot working region of 8418 die steel was determined to be the deformation temperature of 1100-1150 ℃ and the strain rate of 0.01-0.05 s-1. Microstructural analysis shows that in the optimal hot working region, the material undergoes large-area dynamic recrystallization with uniform and equiaxed grains, demonstrating good processing stability. Thus, this study provides an important reference for the reasonable selection of hot processing parameters for 8418 die steel.

Funds：

山西省科技成果引导专项（202204021301057）

作者简介：陈琦（1998-），男，硕士研究生 E-mail：857637648@qq.com 通信作者：李华英（1981-），男，博士，硕士生导师，教授 E-mail：lihy@tyust.edu.cn

Reference：

[1]Motlagh Z S, Tolaminejad B, Momeni A. Prediction of hot deformation flow curves of 1.4542 stainless steel [J]. Metals and Materials International, 2021, 27(8): 2512-2529.

[2]Lin Y C, Chen X M, Liu G. A modified JohnsonCook model for tensile behaviors of typical highstrength alloy steel [J]. Materials Science and Engineering: A, 2010, 527(26): 6980-6986.

[3]Shi C, Xu H, Wang S, et al. Hot deformation characteristics and microstructure evolution of electroslag remelted 15Cr-22Ni-1Nb austenitic heatresistant steel [J]. Materials Characterization, 2021, 182: 111564.

[4]Samantaray D, Mandal S, Bhaduri A K. A comparative study on Johnson Cook, modified ZerilliArmstrong and Arrheniustype constitutive models to predict elevated temperature flow behaviour in modified 9Cr-1Mo steel [J]. Computational Materials Science, 2009, 47(2): 568-576.

[5]AbbasiBani A, ZareiHanzaki A, Pishbin M H, et al. A comparative study on the capability of JohnsonCook and Arrheniustype constitutive equations to describe the flow behavior of Mg-6Al-1Zn alloy [J]. Mechanics of Materials, 2014, 71: 52-61.

[6]Sahoo S K, Sahoo B N, Panigrahi S K. Effect of insitu submicron sized TiB2 reinforcement on microstructure and mechanical properties in ZE41 magnesium matrix composites [J]. Materials Science and Engineering: A, 2020, 773: 138883.

[7]Zhang G H, Tian Y H, Song Y H,et al. A comparative study of three constitutive models concerning thermomechanical behavior of Q345 steel during hot deformation [J]. Crystals, 2022, 12(9): 1262-1262.

[8]Prasad Y V R K, Gegel H L, Doraivelu S M, et al. Modeling of dynamic material behavior in hot deformation: Forging of Ti-6242 [J]. Metallurgical Transactions A, 1984, 15(10): 1883-1892.

[9]Lin X J, Huang H J, Yuan X G, et al. Establishment and validity verification of the hot processing map of a Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy with a lamellar microstructure [J]. Materials Characterization, 2022, 183: 111599.

[10]王晓溪, 张翔, 王华东, 等. 基于热加工图的6061铝合金热压缩变形特性研究[J]. 特种铸造及有色合金, 2017, 37(9): 944-948.

Wang X X, Zhang X, Wang H D, et al. Study on hot compressive characteristics of 6061 aluminum alloy based on processing map [J]. Special Casting and Nonferrous Alloys, 2017, 37(9): 944-948.

[11]舒滢, 曾卫东, 周军, 等. BT20合金高温变形行为的研究 [J]. 材料科学与工艺, 2005, 13(1): 66-69.

Shu Y, Zeng W D, Zhou J, et al. A study on the hot deformation behavior of BT20 alloy [J]. Materials Science and Technology, 2005, 13(1): 66-69.

[12]朱鸿昌. TB17钛合金热加工过程组织演变规律研究 [D]. 南昌:南昌航空大学,2022.

Zhu H C. Research on the Microstructure Evolution of TB17 Titanium Alloy during Hot Working Process [D]. Nanchang: Nanchang Hangkong University, 2022.

[13]栾娜. 镁合金高温变形力学行为和组织演变规律研究 [D]. 长沙: 湖南大学, 2008.

Luan N. Research on Hightemperature Deformation Mechanical Behavior and Microstructure Evolution of Magnesium Alloy [D]. Changsha: Hunan University, 2008.

[14]Sellars C M, Mctegart W J. On the mechanism of hot deformation [J]. Acta Metallurgica, 1966, 14(9): 1136-1138.

[15]Zener C, Hollomon J H. Effect of strain rate upon plastic flow of steel [J]. Journal of Applied Physics, 1944, 15(1): 22-32.

[16]Xia Y F, Long S, Wang T Y, et al. A study at the workability of ultrahigh strength steel sheet by processing maps on the basis of DMM [J]. High Temperature Materials and Processes, 2017, 36(7): 657-667.

[17]Prasad Y V R K. Recent advances in the science of mechanical processing [J]. Indian Journal of Technology, 1990, 28(6-8): 435-451.

[18]王斌, 王琪伟, 宗影影, 等. 5A06铝合金环形连接框等温模锻坯料设计及工艺验证[J]. 锻压技术, 2023, 48(1): 29-45.

Wang B, Wang Q W, Zong Y Y, et al. Design on isothermal die forging billet for 5A06 aluminum alloy ring connecting frame and process validation[J]. Forging & Stamping Technology, 2023, 48(1): 29-45.

[19]曾云, 李卫平, 刘升, 等. Simufact Forming在模拟30CrNi2MoV钢锭加热及锻造过程的应用[J]. 锻压技术, 2024, 49(1): 59-66.

Zeng Y, Li W P, Liu S, et al. Application of Simufact Forming in heating and forging process simulation of 30CrNi2MoV steel ingot[J]. Forging & Stamping Technology, 2024, 49(1): 59-66.

[20]贾飞凡. ZL114A铸造铝合金MIG焊接工艺及性能研究 [D]. 太原: 中北大学, 2016.

Jia F F. Research on MIG Welding Process and Performance of ZL114A Cast Aluminum Alloy [D]. Taiyuan: North University of China, 2016.

Service：

【This site has not yet opened Download Service】【Add Favorite】