锻压技术

模具钢的高温变形行为及本构模型的建立

英文标题：Deformation behavior at high temperature and establishment of constitutive model for die steel

作者：刘玉冰管延锦丁慧莹陈凤娇林军

单位：山东大学

关键词：638模具钢高温变形行为 JohnsonCook模型 Arrhenius模型应变补偿

分类号：TG143.5；TG155.5

出版年,卷(期):页码：2023,48(9):220-229

摘要：

准确的材料本构模型是有限元数值建模与模拟的基础和关键。在应变速率为0.001~10 s-1和变形温度为750~1150 ℃的条件下，进行了638模具钢热模拟实验，得到了其在不同条件下的应力-应变曲线，研究了其高温变形行为。结果表明，随着应变的增加，流动应力急速增大，达到峰值后缓慢减小并最终趋于平衡，这是材料加工硬化和动态软化综合作用的结果。对应力-应变曲线进行摩擦修正后，分别基于改进JohnsonCook本构模型和应变补偿的Arrhenius本构模型建立了638模具钢本构模型，两者的平均相对误差分别为8.03%和7.66%，综合考虑所建本构模型的精确度和实际激光热处理中的高温、高应变速率情况，建议选用基于应变补偿的Arrhenius本构模型。

An accurate material constitutive model is the foundation and key of finite element numerical modeling and simulation. Therefore, the thermal simulation experiments of 638 die steel were carried out under the conditions of strain rate of 0.001-10 s-1 and deformation temperature of 750-1150 ℃, and its stress-strain curves under different conditions were obtained to analysis its high temperature deformation behavior. The results show that the flow stress increases sharply with the increasing of strain, and then decreases slowly and finally tends to equilibrium after reaching the peack, which is the result of the combined effect of work hardening and dynamic softening of the material. After friction correction of the stress-strain curve, the constitutive models of 638 die steel are established based on the improved Johnson-Cook model and the strain-compensated Arrhenius model, respectively, and the average relative errors of the two are 8.03% and 7.66%, respectively. Considering the accuracy of the constructed constitutive model and the condition of high temperature and high strain rate in the actual laser heat treatment, it is recommended to use the Arrhenius constitutive model based on strain compensation.

基金项目：

国家重点研发计划（2020YFB2010301）

作者简介：刘玉冰（1999-），女，硕士研究生 E-mail：202134178@mail.sdu.edu.cn 通信作者：管延锦（1969-），男，博士，教授 E-mail：guan_yanjin@sdu.edu.cn

参考文献：

[1]崔忠圻, 覃耀春. 金属学与热处理[M]. 2版. 北京: 机械工业出版社, 2011.

Cui Z Q, Tan Y C. Metallurgy and Heat Treatment [M]. 2nd Edition. Beijing:China Machine Press, 2011.

[2]陈光南. 激光热处理新技术及其应用[J]. 金属热处理, 1998，(7): 29-32.

Chen G N. New technology of laser heat treatment and its application[J]. Metal Heat Treatment, 1998，(7): 29-32.

[3]Johnson G R, Cook W H. A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures[J]. Engineering Fracture Mechanics, 1983，(21): 541-548.

[4]Johnson G R, Cook W H. Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures[J]. Engineering Fracture Mechanics, 1985, 21(1): 31-48.

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

[6]刘泳, 赵海涛, 苏继伟, 等. 塑料模具钢的热压缩流变应力行为浅析[A]. 2019年炼钢生产新工艺、新技术、新产品研讨会[C]. 宜兴，2019.

Liu Y, Zhao H T, Su J W, et al. An analysis of the hot compression rheological stress behavior of plastic mold steel [A]. Proceedings of the 2019 Symposium on New Processes, Technologies and Products in Steelmaking Production[C]. Yixing, 2019.

[7]胡志强, 王开坤, 詹建明, 等. 新型热作模具钢5CrNiMoVNb的热变形行为研究[J]. 钢铁研究学报，2023，35(4): 443-453.

Hu Z Q, Wang K K, Zhan J M, et al. Study on the thermal deformation behavior of new hot work die steel 5CrNiMoVNb[J]. Journal of Iron and Steel Research, 2023，35(4): 443-453.

[8]Homayounfard M, Ganjiani M. A large deformation constitutive model for plastic straininduced phase transformation of stainless steels at cryogenic temperatures[J]. International Journal of Plasticity, 2022, 156: 103344.

[9]邱宇, 李绍伟, 曾元松, 等. 热作模具钢4Cr5MoSiV1的热变形行为及本构模型修正[J]. 塑性工程学报, 2021, 28(1): 147-153.

Qu Y, Li S W, Zeng Y S, et al. Thermal deformation behavior and intrinsic model correction of hot work die steel 4Cr5MoSiV1[J]. Journal of Plasticity Engineering, 2021, 28(1): 147-153.

[10]Wanjara P, Jahazi M, Monajati H, et al. Hot working behavior of nearα alloy IMI834[J]. Materials Science and Engineering: A, 2005, 396(1-2): 50-60.

[11]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.

[12]周琳, 王子豪, 文鹤鸣. 简论金属材料JC本构模型的精确性[J]. 高压物理学报, 2019, 33(4): 3-16.

Zhou L, Wang Z H, Wen H M. A brief discussion on the accuracy of the JC intrinsic structure model for metallic materials[J]. Journal of High Pressure Physics, 2019, 33(4): 3-16.

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