高强结构钢热变形行为及流变应力模型研究  

Investigation on hot deformation behavior and mathematical models of flow stress of high-strength structural steel

作　　者：张文[1,2] 郭心如[1,2] 吴毅平[1] 赵德文[2] 

机构地区：[1]宝信软件股份有限公司,上海201203 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《世界钢铁》2010年第6期63-66,共4页World Iron & Steel

基　　金：国家自然科学基金项目(51074052)

摘　　要：利用MMS-300热力模拟实验装置对Nb、V、Ti微合金化Q550高强度结构钢进行了单道次压缩试验,研究了试验钢的高温变形行为,并建立了相应的流变应力模型。试验结果表明,变形抗力随变形温度的升高而降低,二者呈幂函数关系;变形抗力随应变速率的增大而增大,二者呈双对数关系。试验钢在峰值及稳定状态时形变激活能分别为329.55kJ/mol和295.31kJ/mol,且流变应力模型预测结果与试验结果吻合良好。The high temperature deformation behavior of Nb, V and Ti microalloyed high-strength structural steel was investigated through high-temperature single pass reduction tests on a MMS - 300 thermomechanical simulator, and relavant mathematical models of flow stress were established. The results show that the deformation resistance decreases with the increase of temperature and is in power function relationship with the temperature. Meanwhile, the deformation resistance increases with the increase of strain rate and is in log - log relationship with the strain rate. The deformation activation energy of the tested steel is determined to be about 329.55 kJ/mol and 295.31 kJ/mol at peak and steady states respectively. The results predicted by the flow stress models are in good agreement with the results of the test.

关 键 词：Q550钢 动态再结晶 激活能 数学模型 

分 类 号：TG142.41[一般工业技术—材料科学与工程]