摘要
在Gleeble-3500热力学模拟实验机上对Q235A钢试样进行单道次和双道次热压缩实验,获得流变应力曲线.把静态再结晶体积分数看作是时间的函数,将其与热变形结束后位错密度的变化联系起来.通过对热压缩实验获得的流变应力曲线的逆分析,提出了确定静态再结晶动力学模型的新方法.它可以取代传统的通过对淬火微观组织金相分析来估箅静态再结晶动力学的方法.运用此方法于普碳钢的热压缩实验中,在一定的形变量范围内获得了静态再结晶动力学方程.与已有的模型作比较,本文提出的方法仅需少量实验和计算即可获得准确的静态再结晶动力学模型.
The flow curves of Q235A steel sample were obtained using single-hit and doublehit hot compression tests on Gleeble-3500 thermomechanical simulator. The change of dislocation density during inter-pass is related to the static recrystallization volume fraction, which can be seen as a function of time. Based on the inverse analysis of the flow curves, a new method to estimate the kinetics for static recrystallization was proposed. Conventional metallography approach of using quenched microstructure to evaluate the kinetics for static recrystallization can be replaced by this method. The proposed method was applied to the hot compression tests of plain carbon steel, and the kinetics for static recrystallization are obtained successfully for some range of deformation at elevated temperatures. By comparing with model reported in the literature, it is confirmed that the proposed method could provide accurate kinetics for static recrystallization, and needed shorter time for experiment and computation.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第7期837-842,共6页
Acta Metallurgica Sinica
基金
教育部高等学校博士学科点基金项目20050216007
河北省自然科学基金项目E2004000223资助~~
关键词
静态再结晶
流变应力曲线
热压缩
逆分析
位错密度
static recrystallization, flow curve, hot compression, inverse analysis, dislocationdensity
