AerMet100钢的热变形显微组织演变及动态再结晶行为  

Microstructure Evolution and Dynamic Recrystallization Behavior of Hot Deformed AerMet100 Steel

作　　者：王鑫[1] 董洪波[1] 邹忠波[1] 王明主 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2016年第2期121-125,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51164029)

摘　　要：采用Gleeble-3500热模拟试验机对超高强度钢AerMet100进行热压缩试验,研究其在变形温度为850~1 150℃和应变速率为0.01~10s^(-1)条件下的动态再结晶行为。结果表明,通过分析应力-应变曲线的特征及金相观察,可知AerMet100钢在不同变形条件下呈现出加工硬化、动态回复及动态再结晶特征,且变形温度的升高与应变速率的降低均有利于发生动态再结晶。通过对热变形试验数据的分析计算,建立了高温变形本构关系,动态再结晶临界应变模型和动态再结晶体积分数模型。利用所建立模型对动态再结晶行为进行预测,得到变形温度的下降及应变速率的增加会推迟动态再结晶发生。The dynamic recrystallization（DRX）behavior of ultra-high strength AerMet100 steel during hot compression test was simulated at 850-1 150 ℃ and 0.01-10s^-1 on a Gleeble-3500 thermo-mechanical simulator.The results show that the AerMet100 steel shows a working hardening,dynamic recovery（DRV）and dynamic recrystallization（DRX）behavior,respectively,under different deformation conditions.Meanwhile,the increase of temperature and the decrease of strain rate are beneficial to dynamic recrystallization.The constitutive relation,DRX critical strain model and DRX kinetics model were established by analysis of the experimental data of hot deformation.The DRX kinetics model predicts that the decrease of deformation temperature and the increase of strain rate can postpone occurrence of DRX.

关 键 词：超高强度钢 动态再结晶 本构关系 动力学 

分 类 号：TG142.1[一般工业技术—材料科学与工程]