首页|15CrMoG耐热钢高温变形行为及Arrhenius本构模型

15CrMoG耐热钢高温变形行为及Arrhenius本构模型

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采用Gleeble-3500热模拟试验机对15CrMoG耐热钢进行了变形温度为1173.15～1473.15 K,应变速率为5～20 s-1的高温压缩实验.实验数据表明,15CrMoG具有负的温度敏感性和正的应变速率敏感性,且再结晶晶粒尺寸随变形温度的升高而明显增加.通过线性拟合求解出Arrhenius本构模型的材料参数,建立了基于峰值应力的表征参数和物理基参数本构模型.表征参数本构模型对峰值应力的预测值与实验数据的皮尔森相关系数为0.99824,物理基参数本构模型对峰值应力的预测值与实验数据的皮尔森相关系数为0.99807.为进一步提升本构模型的适用性,建立了考虑应变补偿的Arrhenius本构模型,实现了对整个应变范围内流动应力的预测.在整个应变范围内,对模型进行了误差分析,表征参数本构模型的最大相对误差为3.76％,物理基参数本构模型最大相对误差为6.04％.
High-temperature deformation behavior of 15CrMoG heat-resistant steel and Arrhenius constitutive model
The high-temperature compression experiments at deformation temperature of 1173.15-1473.15 K and strain rate of 5～20 s-1 of 15CrMoG heat-resistant steel were carried out by Gleeble-3500 thermal simulator.The experimental data show that 15CrMoG has nega-tive temperature sensitivity and positive strain rate sensitivity,and the recrystallized grain size markedly increases with the increase of de-formation temperature.The material parameters of Arrhenius constitutive model were solved by linear fitting,and the constitutive models of characterization parameters and physical basis parameters based on peak stress were established.The Pearson correlation coefficient be-tween the predicted value of peak stress and the experimental data is 0.99824 in the constitutive model of characterization parameters,and 0.99807 in the constitutive model of physical basis parameters.To further improve the applicability of the constitutive model,the Arrhe-nius constitutive model considering strain compensation was established,and the prediction for flow stress in the whole strain range was re-alized.In the whole strain range,the error analysis of the models was carried out.The maximum relative error of the constitutive model of characterization parameters is 3.76％,and the maximum relative error of the constitutive model of physical basis parameters is 6.04％.

15CrMoG steelhigh-temperature deformation behaviorconstitutive modelcharacterization parameterphysical basis pa-rameter

杨京、王伟、张双杰、马世博、闫华军

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河北科技大学河北省材料近净成形技术重点实验室,河北石家庄 050018

河北省汽车冲压模具技术创新中心,河北泊头 062150

汽车冲压模具工程研究中心,河北泊头 062150

河北省楔横轧技术创新中心,河北石家庄 050031

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15CrMoG钢 高温变形行为 本构模型 表征参数 物理基参数

河北省自然科学基金资助项目河北省自然科学基金资助项目河北省创新能力提升计划项目石家庄市后补助奖励专项基金资助项目

E2021208025E2020208044225A2201D227790017H

2024

10.3969/j.issn.1007-2012.2024.02.018

塑性工程学报
中国机械工程学会

塑性工程学报

CSTPCD北大核心
影响因子：0.46
ISSN：1007-2012
年,卷(期)：2024.31(2)
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