曲轴用非调质钢C38N2轧制过程中MnS夹杂演变规律  

Evolution of MnS in non-quenched and tempered crankshaft steel C38N2 during rolling

作　　者：董正强[1] 蒋波[1] 张朝磊[1] 周乐育[1] 刘雅政[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2015年第8期144-149,共6页Transactions of Materials and Heat Treatment

基　　金：中央高校基本科研业务费专项资金资助项目(FRF-TP-14-003A1)

摘　　要：为控制磁痕缺陷的产生,研究了曲轴用非调质钢C38N2在轧制过程中,累积压下量、道次压下量和变形温度对钢中Mn S夹杂的数量、尺寸和形态演变规律的影响。结果表明,随累积压下量增大,由铸坯到中间坯到轧材,纵剖面单位面积观察到的Mn S夹杂数量不断减少。累积压下量和变形温度相同情况下,道次压下量越大,Mn S长宽比越大。累积压下量和道次压下量相同情况下,变形温度越高,Mn S长宽比越小。边部Mn S夹杂数量显著大于1/2半径处,1/2半径处Mn S夹杂数量略大于心部;Mn S夹杂的长宽比基本上符合1/2半径处>心部>边部的规律。开坯轧制可显著减少纵剖面单位面积中Mn S的数量;变形温度越高,道次压下量越大,则轧制过程中的变形渗透程度越高,Mn S夹杂的数量和形态分布越均匀。In order to control the magnetic mark defect, the effects of cumulative reduction, pass reduction and deformation temperature on the evolution of quantity, size and morphology of MnS inclusions in the rolling process of non-quenched and tempered crankshaft steel C38N2 were studied. The results show that the quantity of MnS per unit area on the longitudinal section is reduced constantly from slabs to intermediate slabs, and rolled products as the cumulative reduction is increased. Under the same cumulative reduction and deformation temperature, the aspect ratio of MnS increases with the increasing pass reduction. The aspect ratio of MnS is reduced as the deformation temperature increases under the conditions of the same cumulative reduction and pass reduction. The quantity of MnS in the edge is obviously larger than that in 1/2 radius, while the quantity of MnS in 1/2 radius is slightly larger than that in the core. The aspect ratio of the MnS inclusions in the slab and rolled products decreases from the regions of 1/2 radius, core to edge. The quantity of MnS per unit area on the longitudinal section can he reduced significantly by breakdown rolling. The higher deformation temperature and larger pass reduction is favourable for deformation uniformity and the more uniform distribution of quantity and morphology of MnS can be obtained.

关 键 词：非调质钢 MNS 累积压下量 道次压下量 变形温度 

分 类 号：TG142.33[一般工业技术—材料科学与工程]