Q235低碳钢高温变形过程的动态组织演化分析  

Dynamical microstructure evolution of Q235 low carbon steel during high temperature deformation

作　　者：张麦仓[1] 董建新[1] 曾燕屏[1] 孙影[1] 杨忠民[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《北京科技大学学报》2005年第2期183-186,196,共5页Journal of University of Science and Technology Beijing

基　　金：国家"973"项目(No.G1998061501)

摘　　要：通过Gleeble 2000上的热模拟压缩实验,分析了Q235低碳钢在不同热加工参数下的 动态组织演化特征.结果表明:应变速率和温度对Q235钢的奥氏体形变特征影响强烈.在相 同变形温度下,应变速率的提高可以明显推迟动态再结晶的发生:应变速率较低时,降低温 度同样可以延迟动态再结晶的发生.利用定量金相技术及线性、非线性拟合算法,建立了 Q235钢热变形过程的唯像本构关系及组织演化动力学模型,并将其应用于Autoforge3.1有限 元软件平台.压缩过程有限元模拟分析表明,分别采用Arrhenius双曲正弦方程描述Q235钢 的唯像本构关系及Yada模型表征Q235钢变形过程的平均晶粒尺寸,可以满足预测精度,与 实际变形过程基本吻合.The dynamical microstructure evolution behavior of Q235 low carbon steel at high temperature was systematically investigated through physical simulated tests carried out on a Gleeble 2000 machine. The experimental results showed that hot working parameters such as forming temperature and strain rate affected the dynamical micro-structure evolution behavior of Q235 steel to a great extent. At a given temperature, dynamical recrystalization could be postponed with the increasing of strain rate; meanwhile, at a lower strain rate, this phenomenon could occur with the decreasing of temperature. The quantitative metallurgical technique and the linear/non-linear regression analysis were used to construct an Arrhenius-type phenomenological constitutive relationship and a Yada-type kinetically microstructure equation of Q235 steel at high temperature, which were coupled into the finite element software of Autoforge 3.1. The results of numerical simulation showed that the phenomenological constitutive relationship and microstructure evolution equation depicted the dynamical microstructure evolution behavior of Q235 low carbon steel at high temperature very well.

关 键 词：Q235低碳钢 高温变形 组织演化 再结晶 

分 类 号：TG142.31[一般工业技术—材料科学与工程]