Si对过共析锰钢力学性能及晶界组织的影响  

EFFECTS OF Si ON MECHANICAL PROPERTIES AND GRAIN BOUNDARY STRUCTURES IN HYPEREUTECTOID Mn STEELS

作　　者：朱晓东[1] 李承基[1] 章守华[1] 邹明[1] 苏世怀[1] 

机构地区：[1]北京科技大学,攀枝花钢铁[集团]公司,北京科技大学金相教研室北京科技大学,攀枝花钢铁公司,北京科技大学金相教研室

出　　处：《金属学报》1996年第11期1130-1138,共9页Acta Metallurgica Sinica

基　　金：国家经贸委重点技术开发项目

摘　　要：本文用ＳＥＭ，ＴＥＭ研究了Ｓｉ对过共析锰钢经９５０℃（＞Ａｃｍ）奥氏体化和５６０℃等温处理后的组织及力学性能的影响结果表明，Ｓｉ提高冲击韧性和延伸率，抑制先共析渗碳体在奥氏体晶界呈连续网状析出，并促进在过共析钢中晶界铁素体的形成．本文重点讨论了含Ｓｉ过共析钢中晶界铁素体的形成机理及其对韧性的影响．The effects of Si on the grain boundary structure and mechanical properties of hypereutectoid Mn steels austenitized at 950℃ and isothemially transformed at 560℃were studied by means of SEM and TEM. The experimental results showed that the impact toughness and elongation can be improved by Si additions. The observation of microstructure revealed that grain boundary cemetite networks can be inhibited and grain boundary ferrite formed in these hypereutectoid steels by Si addition. The formation mechanism of grain boundary ferrite has also been discussed.

关 键 词：过共析钢 晶界 铁素体 珠光体 硅 

分 类 号：TG142.13[一般工业技术—材料科学与工程]