低碳钢氧化铁皮的还原动力学研究  

Research on Reduction Kinetics of Low Carbon Steel Oxide Scale

作　　者：刘效北 孙彬[1] 郝明欣 柴元 LIU Xiaobei;SUN Bin;HAO Mingxin;CHAI Yuan(Mechanical Engineering Institute,Shenyang University,Shenyang 110044,China)

机构地区：[1]沈阳大学机械工程学院,辽宁沈阳110044

出　　处：《热加工工艺》2021年第24期52-56,60,共6页Hot Working Technology

基　　金：国家自然科学基金青年基金项目(51301111);辽宁省自然基金项目(2019-KF-05-04);东北大学轧制技术及连轧自动化国家重点实验室开放课题基金项目(2017RALKFKT007)。

摘　　要：为建立高效环保的低碳钢氧化铁皮还原新工艺理论基础,利用热重分析仪对未平整和平整两种状态下低碳钢氧化铁皮分别进行了还原动力学实验。研究了在30%氢氮混合气氛下,温度区间500~850℃时低碳钢表面氧化铁皮的还原动力学曲线,总结两种状态下氧化铁皮的还原动力学规律。结果表明:整个还原期分为四个阶段:诱导期、加速期、减缓期和结束期。其中温度的变化对诱导期的影响明显,温度的升高会缩短诱导期的时间。整个反应的主要影响因素为内扩散、相界扩散、相界反应和原子形核与长大,其中还原反应的控制环节为原子的形核与长大。In order to establish the theoretical basis of the new process of low carbon steel iron scale reduction with high efficiency and environmental protection,the reduction kinetics experiments of low carbon steel iron scale under the condition of unrolled and rolled were carried out respectively by thermogravimetric analyzer.By studying the reduction kinetics curve of the iron scale on the surface of low carbon steel at 500-850℃under the atmosphere of 30%hydrogen and nitrogen mixture,the reduction kinetics law of the iron scale on the surface of low carbon steel under two states was summarized.The results show that the whole reduction period is divided into four stages:induction period,acceleration period,slowing period and end period.The change of temperature has obvious influence on the induction period,and the increase of temperature shortens the time of induction period.The main influencing factors of the whole reaction are internal diffusion,phase boundary diffusion,phase boundary reaction and atomic nucleation and growth,among which the control link of reduction reaction is the nucleation and growth of the atomic.

关 键 词：低碳钢 氧化铁皮 还原动力学 还原反应 

分 类 号：TG174.4[金属学及工艺—金属表面处理]