VN微合金钢中Ti脱氧夹杂物诱导晶内铁素体析出行为  

Precipitation behavior of inclusion-induced intra-granular ferrite in Ti-deoxided VN microalloyed steel

作　　者：杜松林[1] 金友林[1] 高振波[1] 杨应东[1] 包燕平[2] 

机构地区：[1]马鞍山钢铁股份有限公司,马鞍山243000 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《北京科技大学学报》2010年第5期574-580,共7页Journal of University of Science and Technology Beijing

基　　金：国家科技支撑计划资助项目(No.2007BAE30B01)

摘　　要：通过热力学计算及热态实验,研究了Ti脱氧VN微合金钢中,含Ti夹杂物析出行为及其诱导晶内铁素体析出行为.结果发现,夹杂物与铁素体、珠光体之间的相对位置关系存在六种形式,通过赋予这些形式不同的诱导能力系数,定量比较夹杂物类型、尺寸与诱导能力的关系.Ti的复合氧化物诱导能力最强,Al2O3最弱.Ti的复合氧化物诱导最佳尺寸4～6μm,其他夹杂物最佳尺寸为2～4μm.通过控制夹杂物种类、尺寸促进晶内铁素体析出,能够细化晶粒.Precipitation behaviors of Ti-containing inclusions and inclusion-induced intragranular ferrite were investigated by thermodynamic calculations and laboratory experiments.The results show that there are six forms about position relations of inclusions to ferrite grains and pearlite grains.The effects of inclusion types and size on the inclusion-inducing ability were analyzed quantificationally by defining the index of inducing ability.It is indicated that the ability of Ti-containing complex oxide-inclusions inducing intragranular ferrite is the best,but that of Al2O3 is the worst.The optimal size of Ti-containing complex oxide-inclusions is 4 to 6μm and that of other inclusions is 2 to 4μm.Intra-granular ferrite is induced to precipitate by controlling the inclusion types and size,leading to grain refinement.

关 键 词：微合金钢 晶内铁素体 夹杂物 脱氧 晶粒细化 

分 类 号：TG142.33[一般工业技术—材料科学与工程]