加热温度对钛微合金化钢奥氏体晶粒长大的影响  

Effect of Heating Temperature on the Growth of Austenite Grain of Titanium Microalloyed Steel

作　　者：罗许[1,2] 康永林[1] 李俊洪[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]攀钢集团研究院有限公司,四川攀枝花617000

出　　处：《钢铁钒钛》2016年第2期133-138,共6页Iron Steel Vanadium Titanium

基　　金：国家高技术研究发展计划(863计划)自主项目(No.2013AA031601);"十二五"国家科技支撑计划资助项目(No.2012BAF04B01)

摘　　要：通过将钛微合金化钢在箱式电炉中加热至850～1 250℃保温30 min,观察其奥氏体晶粒组织及Ti的析出粒子分布情况,研究钛微合金化钢奥氏体晶粒长大行为及Ti的固溶规律。结果表明：随着加热温度的升高,试验钢存在两个奥氏体晶粒粗化温度,分别为1 050℃和1 250℃,与Ti两种析出粒子的固溶温度相对应,但数值比固溶温度低。分析奥氏体晶粒两个阶段的长大过程发现,随着TiC析出粒子的溶解,晶粒长大激活能从265.6 k J/mol降低至239.8 k J/mol。The Ti microalloyed steel was heated in an electric furnace up to the temperature ranging from850 ℃ to 1 250 ℃ and heldfor 30 min. The behavior of austenite grain growth and the solid solution of Ti were investigated by observing the microstructure of austenite grain and the distribution of precipitates.The results indicate that the tested steel has two austenite grain coarsening temperatures,i. e.,1 050 ℃and 1 250 ℃,corresponding to the solution temperature of two types of Ti precipitates,however,they are lower than the values expected from solid solution product equation. It is found that the activate energy of grain growth decreases from 265. 6 k J / mol to 239. 8 k J / mol with the dissolving of TiC precipitates by analyzing two stages of the austenite grain growth process.

关 键 词：钛微合金化钢 加热温度 奥氏体 晶粒 析出 

分 类 号：TG142.1[一般工业技术—材料科学与工程]