稀土Ce含量对4Cr5MoSiV1钢中夹杂物的变质作用  

Modification effect of rare earth Ce content on inclusions in 4Cr5MoSiV1 steel

作　　者：史学红 杨礼林 夏明 徐祺昊 赵莉萍[2] Shi Xuehong;Yang Lilin;Xia Ming;Xu Qihao;Zhao Liping(Department of Metallurgy and Environmental Engineering,Shanxi Engineering Vocational College,Taiyuan Shanxi 030009,China;School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China)

机构地区：[1]山西工程职业学院冶金与环境工程系,山西太原030009 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《金属热处理》2022年第11期223-229,共7页Heat Treatment of Metals

基　　金：内蒙古自治区科技创新引导奖励资金项目(201/090262001);内蒙古科技大学创新基金(2019QDL-B05)。

摘　　要：为探究Ce元素对热作模具钢中夹杂物的影响及其作用机理,用场发射扫描电镜(SEM/EDS)和附带的夹杂物自动分析系统对不同Ce含量的4Cr5MoSiV1钢中夹杂物的类型、形貌、数量、尺寸及其分布进行观察和统计分析。结果表明,不含Ce的试样中夹杂物不仅数量多、平均尺寸较大且形状不规则,主要类型为Mg-Al-O类、MnS和Mg-Al-O外覆盖MnS的夹杂物;随Ce含量的增加,试样中的夹杂物有数量和平均尺寸减小、并变质为球形稀土硫氧化物的趋势。当钢中Ce含量为0.0070%时,夹杂物的数量最少,平均尺寸最小;继续增加稀土Ce含量到0.0120%时,会形成更多的硫氧化物夹杂,且夹杂物有数量增多、平均尺寸增大的趋势。随着凝固过程的进行,Ce主要以稀土硫氧化物形式存在试验钢中,60%以上的夹杂物会被凝固前沿推动,且最终留在晶界附近。In order to explore the effect of Ce content on inclusions in hot work die steel and its action mechanism,the types,morphology,quantity,size and distribution of inclusions in 4 Cr5 MoSiV1 steel with different Ce contents were observed and statistically analyzed by means of field emission scanning electron microscope(SEM/EDS)and the attached automatic inclusion analysis system.The results show that the inclusions in the Ce-free specimen are not only larger in number,larger in average size but also more irregular in shape,mainly composing of Mg-Al-O type,MnS and Mg-Al-O covered with MnS.With the increase of Ce content,the number and average size of inclusions in the specimen decrease and change into spherical rare earth sulfur oxides.When the content of Ce in the steel is 0.0070%,the number and average size of inclusions are the least.With the increase of rare earth Ce content to 0.0120%,more sulfur oxide inclusions are formed,and the number and average size of inclusions tend to increase.With the solidification process going on,Ce mainly exists in the tested steel in the form of rare earth sulfur oxides,and more than 60%of the inclusions will be pushed by the solidification front and finally stay near the grain boundary.

关 键 词：稀土Ce 4CR5MOSIV1钢 夹杂物 变质作用 

分 类 号：TF763.2[冶金工程—钢铁冶金]