CAJ | 학술논문

研究ZK60合金的高温流变应力行为.分别采用Kocks-Mecking模型和Avrami方程对合金的应变强化和动态再结晶过程进行模拟,在此基础上,构建一个考虑合金动态再结晶软化的流变应力方程并对流变应力进行预测.结果表明:预测曲线与实验结果具有很高的相关系数,所构建的流变应力方程能准确地描述热变形过程中合金的流变应力行为.微观组织观察表明在变形初期合金组织主要为动态回复组织,随着应变增加,逐渐转变为再结晶组织.
연구ZK60합금적고온류변응역행위.분별채용Kocks-Mecking모형화Avrami방정대합금적응변강화화동태재결정과정진행모의,재차기출상,구건일개고필합금동태재결정연화적류변응력방정병대류변응력진행예측.결과표명:예측곡선여실험결과구유흔고적상관계수,소구건적류변응력방정능준학지묘술열변형과정중합금적류변응역행위.미관조직관찰표명재변형초기합금조직주요위동태회복조직,수착응변증가,축점전변위재결정조직.
The flow stress behavior of ZK60 alloy at elevated temperature was investigated.The strain hardening and dynamic recrystallization of the alloy were modeled by Kocks-Meching model and Avrami equation,respectively.A new constitutive equation during hot deformation was constructed to predict the flow stress considering the dynamic recrystallization.The results show that the flow stress curves predicted by the proposed equation have high correlation coefficients with the experimental data,which confirms that the developed model is accurate and effective to establish the flow stress equation of ZK60 magnesium alloy during hot deformation.Microstructure observation shows that dynamic recovery occurs in the initial stage of hot deformation.However,the microstructure turns to recrystallization structure as the strain increases.