中碳钒微合金非调质钢的热变形行为及本构方程  

Hot Deformation Behavior and Constitutive Equation of Medium Carbon Vanadium Microalloyed Non-quenched and Tempered Steel

作　　者：王安东[1] 王骏宇[1] 施轶超 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《热加工工艺》2016年第13期158-161,共4页Hot Working Technology

基　　金：江苏省自然科学基金资助项目(BK2010354);江苏省科技支撑计划(工业部分-重点项目)(BE2014007-4);江苏省高校自然科学指导性计划项目(09KJD430005)

摘　　要：为了研究中碳含钒微合金非调质钢的热变形行为,在变形温度900~1100℃C和应变速率0.01~10 s^(-1)下通过Gleeble-3500热模拟试验机进行了单道次热压缩试验。结果表明:试验钢因热变形而产生加工硬化,使应力得到提升,应力会随着应变速率的提高和热加工温度的降低而有明显的提升,峰值应力随之升高;通过计算得到试验钢的热变形激活能为285.242kJ/mol,并由此得到了试验钢的本构方程;热压缩过程中试验钢发生了动态再结晶,当发生完全动态再结晶时,应变速率较低和温度较高的试样其晶粒尺寸要比应变速率高和温度较低的试样的晶粒尺寸大。In order to study the hot deformation behavior of medium carbon vanadium microalloyed non-quenched and tempered steel, the single-pass thermal compression tests were done at 900-1100℃ and the strain rate of 0.01-10 s^-1 through Gleeble-3500 thermo-simulation machine. The results show that： test steel produces work hardening because of thermal deformation, and the stress increases. The stress increases significantly with the higher strain rate and the lower temperature, and peak stress also increases. The activation energy of tested steel is 285.242kJ/mol through calculation, and the constitutive equation of the test steel is obtained. The dynamic recrystallization of test steel occurs during the hot compression. When the full dynamic recrystallization occurs, the grain size at low strain rate and high temperature is bigger than that at high strain rate and low temperature.

关 键 词：微合金非调质钢 热压缩 激活能 本构方程 

分 类 号：TG302[金属学及工艺—金属压力加工] TG111