Q550级桥梁钢动态再结晶行为研究  

Dynamic Simulation of Recrystallization of Steels for Bridges with Yield Strength Above 550 MPa

作　　者：孔进丽[1] 董汉雄[2] 邹德辉[2] 王青峰[1] 

机构地区：[1]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [2]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《热加工工艺》2012年第4期39-42,共4页Hot Working Technology

基　　金：国家高技术研究发展计划(863计划)项目(2007AA03Z509)

摘　　要：采用Gleeble-3500热模拟试验机模拟了屈服强度550 MPa级桥梁钢轧板单道次热压缩变形过程,得到了试验钢的真应力-真应变曲线,分析了变形温度和应变速率对动态再结晶行为的影响,并建立了试验钢的再结晶图。结果表明,在较高的变形温度和较低的应变速率下,动态再结晶易进行。实验在动态再结晶激活能为460.14 kJ/mol时,建立了试验钢动态再结晶动力学模型。The single-pass compression test of steels for bridges with yield strength above 550 MPa was investigated by Gleeble-3500 thermal simulator,the true stress-true strain curves of the steel was obtained.The effects of deformation temperature and strain rate on the behavior of dynamic recrystallization were analyzed.The diagrams of dynamic recrystallization was established.The results show that the dynamic recrystallization is easier to occur under higher deformation temperature and strain rate;the activation energy is determined as 460.14 kJ/mol,and an empirical mathematical model for the recrystallization is established.

关 键 词：动态再结晶 真应力-真应变曲线 再结晶图 激活能 动力学模型 

分 类 号：TG142[一般工业技术—材料科学与工程]