定向凝固冷速对Ti-O超细夹杂物析出的影响  

EFFECT OF COOLING RATE ON SUPERFINE Ti-O INCLUSION PRECIPITATION DURING DIRECTIONAL SOLIDIFICATION

作　　者：王利伟[1] 郑少波[1] 郑庆[2] 李慧改[1] 翟启杰[1] 

机构地区：[1]上海大学上海市钢铁冶金重点实验室,上海200072 [2]宝钢研究院,上海201900

出　　处：《金属学报》2007年第6期595-598,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金50334050~~

摘　　要：采用定向凝固法模拟了由纯铁与钛铁制备的样品在凝固过程中二次枝晶臂间溶质富集时Ti-O夹杂物的析出情况,号察了冷却速率对Ti-O超细夹杂物尺寸、数量及分布的影响,验证了凝固过程微观偏析和Ti-O夹杂生成耦合模型．结果表明,随着冷速增高,夹杂尺寸减小,数量增多,分布更均匀．在10 K/min(模铸),100 K/min(方坯),200 K/min(中厚板)冷速下夹杂的平均直径分别为1．87,1．09,0．82μm,夹杂数量分别为0．31×10~4,1．98×10~4和3．27×10~4 mm^(-3)．利用凝固过程溶质富集析出Ti-O超细夹杂物是可行的．Directional solidification method was used to simulate the precipitation of Ti-O inclusions in the sample prepared by pure Fe and Ti-Fe alloy as solute enrichment among secondary dendrites, and the effects of cooling rate on the size, number and distribution of the inclusions were investigated, furthermore the coupled model describing the relationship of microsegregation and Ti-O inclusion precipitation during solidification of liquid steel has been verified. The experimental results indicate that the inclusion size was reduced, the number increased and the distribution was more homogeneous when cooling rate was enhanced. When the cooling rates were 10, 100 and 200 K/min, the average diameters of inclusions were 1.87, 1.09 and 0.82μm, and the numbers were 0.31×10^4,1.98×10^4 and 3.27×10^4 mm^-3, repectively. It has been proved that superfine inclusions can be precipitated during solidification by solute enrichment.

关 键 词：定向凝固 钛氧超细夹杂物 冷却速率 耦合模型 微观偏析 

分 类 号：TG142[一般工业技术—材料科学与工程]