摘要
在Gleeble-1500热模拟试验机上进行高温等温压缩试验,研究了5A06合金在变形温度为320～440℃,变形速率为0.3,1.0和10 s^-1条件下的高温塑性变形行为。计算材料的特征参数并导入双曲正弦形式的Arrhenius方程,获得了以ZenerHollomon参数表示的本构方程,建立了流变应力与变形温度、变形速率之间的关系,为该合金热加工工艺的制定提供指导,同时得出该合金的热变形激活能为154.2 k J·mol^-1。利用DMM加工图理论与Prasad失稳准则,通过叠加功率耗散图与失稳图绘制出不同变形程度下5A06合金的加工图。随着变形程度的增大,加工图中的失稳区增大。在安全加工区域内,变形速率为5～10 s^-1时功率耗散率值最大,为32%～38%,是最佳的热加工区间。
The high temperature isothermal compressive experiments of alloy 5 A06 were conducted by thermal simulation machine Gleeble-1500,and its plastic deformation behavior at high temperature was studied at deformation temperature 320-440 ℃,deformation rates0. 3,1. 0 and 10 s^-1 respectively. Then,the characteristic parameters of the material were calculated and imported into the Arrhenius equation of the hyperbolic sine to obtain an constitutive equation represented by the Zener-Hollomon parameter,and the relationship among the flow stress,deformation temperature and deformation rate was established to provide guidance for the formulation of hot working process. At the same time,it was concluded that the activation energy Q was 154. 2 k J·mol^-1. Furthermore,according to the theory of DMM machining graph and the failure stability criterion of Prasad,the processing maps were drawn by superimposing the power dissipation map and the instability map under different deformation conditions. With the increase of deformation,the instability area increases. Thus,in the safe processing area,the efficiency of power dissipation is up to the maximum 32%-38% at the deformation rates 5-10 s^-1,which is the best machining area.
作者
欧玲
浦荣
曾方欣
聂宇峰
阳建君
Ou Ling;Pu Rong;Zeng Fangxin;Nie Yufeng;Yang Jianjun(School of Metallurgy and Materials Engineering, Hu＇nan University of Technology, Zhuzhou 412007, China)
出处
《锻压技术》
CAS
CSCD
北大核心
2018年第6期123-128,共6页
Forging & Stamping Technology
基金
湖南省自然科学基金资助项目(2018JJ3121)
2016年度湖南省教育厅科学研究项目(16C0460)
关键词
5A06合金
高温塑性变形行为
加工图
本构方程
流变应力
alloy 5A06
plastic deformation behaviors at high temperature
processing map
constitutive equation
flow stress
