首页|HRB600E动态再结晶临界条件及动力学模型的构建

HRB600E动态再结晶临界条件及动力学模型的构建

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利用Gleeble-3500热模拟实验系统对HRB600E高强抗震钢筋进行研究,考察了变形温度为850~1 000 ℃、应变速率为0.01~10.00s-1、最大变形量为60%条件下的动态再结晶行为.通过双曲正弦形Arrhenius关系计算HRB600E高强抗震钢筋变形激活能为232 kJ/mol.根据加工硬化原理和Cingara-McQueen流变应力模型得出的数据可以看出两者在动态再结晶的起始临界应力和应变处表现出相当高的一致性,但Cingara-McQueen流变应力模型得到的临界应力值较高.引入Z参数求出临界应力应变与Z参数的关系式为εc=0.001 6Z0.18,σc=1.16 Z0.166.优化Avrami等学者提出的动态再结晶动力学模型,计算出不同条件下的动态再结晶分数,并对计算结果与实验值比较,发现二者具有显著的相关性.
HRB600E Construction of Critical Conditions and Kinetic Models for Dynamic Recrystallization
Thermal simulation compression experiments were carried out on Gleeble-3500 HRB600E high-strength seismic reinforcement,and the dynamic recrystallization behavior of high-strength seismic steel bars under the conditions of deformation temperature of 850~1 000℃,strain rate of 0.01~10 s-1 and maximum deformation of 60%was studied.Using the hyperbolic sinusoidal Arrhenius relation HRB600E the activation energy of the deformation of the high-strength seismic reinforcement is 232 kJ/mol.The initial critical stress and strain of dynamic recrystallization obtained by the work hardening principle and the Cingara-McQueen rheological stress model are more consistent,and the critical stress value obtained by the Cingara-McQueen rheological stress model is higher,and the relationship between the critical stress-strain and the Z parameter is εc=0.0016Z0.18 and σc=1.16Z0.166 by introducing the Z parameters.Based on the dynamic recrystallization kinetic model and recrystallization volume fraction optimized by Avrami etal.,the dynamic recrystallization kinetic equation is obtained,and the dynamic recrystallization fraction under different conditions is calculated by the equation,and compared with the experimental values,it is found that the two have a high agreement.

HRB600Edynamic recrystallizationcritical strainmaximum softening rateactivation energy

杨丽敏、吴光亮

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中南大学资源加工与生物工程学院,湖南 长沙 410083

HRB600E 动态再结晶 临界应变 最大软化率 激活能

2024

山西冶金
山西省金属学会 山西省有色金属学会

山西冶金

影响因子:0.139
ISSN:1672-1152
年,卷(期):2024.47(8)