45钢在不同相区形变热力学行为和显微组织特征  

Deformation Thermodynamic Behavior and Microstructure Characteristics of 45 Steel in Different Phase Range

作　　者：杨湄[1] 万鸣[2] 

机构地区：[1]西华大学材料科学与工程学院．四川成都610039 [2]西华大学土木工程与建筑学院,四川成都610039

出　　处：《热加工工艺》2011年第24期12-14,共3页Hot Working Technology

基　　金：省高校重点实验室开放研究基金资助项目(西华教字[2009]184号)

摘　　要：对45钢进行不同温度、应变率和变形量热拉伸形变(拉断)后空冷实验,研究了45钢形变温度、应变率、变形量与形变热力学行为和显微组织变化的相互关系。结果表明:将45钢加热到830℃完全奥氏体化后,再分别冷却,在800℃形变,奥氏体发生动态再结晶。在760℃以两种应变率形变,均发生奥氏体形变诱导铁素体相变。在720℃形变,铁素体发生动态回复,形成亚晶组织。The tensile deformation with different temperature, strain rate and deformation of 45 steel was carried out. The relationship between the deformation temperature, strain rate, deformation and thermodynamics behavior, microstructure changes was studied. The results show that the dynamic recrystallization of austenite occurs when austenitizing at 830 ℃ and then coolling, respectively,and deforming at 800 ℃. The austenite deformation induced ferrite transformation occurs when deforming at 760 ℃ with two kinds of sWain rate. The ferrite dynamic recovery and subgrain structure occurs when deforming at 720 ℃

关 键 词：形变温度 应变率 中碳钢 显微组织特征 

分 类 号：TG142[一般工业技术—材料科学与工程]