动态回复/再结晶制备亚微米级超微细晶粒中碳钢  

Ultrafine Grained Medium Carbon Steel of Submicron Level Prepared by Dynamic Recovery and Recrystallization

作　　者：王敏婷[1] 史喜帅 李学通[1] 杜凤山[1] 

机构地区：[1]燕山大学机械工程学院,国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《热加工工艺》2014年第9期40-43,共4页Hot Working Technology

基　　金：河北省自然科学基金项目(E2012203028;E2011203090)

摘　　要：采用Gleeble3500热模拟压缩试验机进行了平面应变压缩实验，研究了中碳钢在变形温度500～800℃．应变速率0．1～50s^-1条件下的变形行为与组织演化规律。结果表明：铁素体晶粒在强塑性应变条件下，存在两种动态软化类型的应力一应变曲线，其细化主要通过动态回复和再结晶完成。中碳35钢在大变形高Z值条件下可以有效获得小于1μm的超微细铁素体晶粒。分析数据后得到数学模型且计算了铁素体形变激活能（Q=273154kJ／mol）。Plane strain compression experiment was done by using Gleeble-3500 thermomechanical simulator. The deformation behavior and microstructure evolution of medium carbon steel were investigated under conditions of deformation temperatures 500-800℃ and strain rates 0.1-50 s^-1. The results show that in the ferrite grains under the strong plastic strain there are two types of dynamic softening stress-strain curves conditions, and grain refinement is mainly completed by dynamic recovery and recrystallization. 35 carbon steel under large deformation and high Z value conditions can effectively obtain less than 1 μm ultra fine ferrite grain. After analyzing the data, the mathematical model was obtained and the deformation activation energy of the ferrite was calculated （value Q=273154kJ/mol ）.

关 键 词：中碳钢 动态回复和再结晶 大变形 超微细铁素体晶粒 

分 类 号：TG142.31[一般工业技术—材料科学与工程]