锰在高硼钢凝固中的合金化作用  

Alloying Effect of Manganese in Solidification of High Boron Steel

作　　者：陈金 吴润[1] 徐凯 曾松盛 CHEN Jin;WU Run;XU Kai;ZENG Songsheng(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Technology Center,Valin Arcelor Mittal Auto Sheet Co.,Ltd.,Loudi 417000,China)

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]华菱安赛乐米塔尔汽车板材有限公司技术中心,湖南娄底417000

出　　处：《热加工工艺》2020年第8期26-29,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51771139)。

摘　　要：铁和硼结合生成硼化物Fe2B,使得合金具有良好的耐磨性。研究了高硼耐磨合金钢的凝固过程,还对锰对其组织及力学性能的影响进行了研究。结果表明:高硼耐磨合金由枝晶组织和共晶组织组成,凝固时前者为初生奥氏体枝晶,后者是(γ+硼化物)共晶体;在冷却过程中这些奥氏体转变为马氏体+铁素体+残余奥氏体;随着锰量的增加,枝晶组织体积分数下降,硼化物的变化不大;Mn主要富集在硼化物和枝晶的边缘,合金中有残留奥氏体,但其耐磨性可达NM500耐磨钢的10.8倍。The boride Fe2B is formed by the combination of iron and boron,which makes the alloy have good wear resistance.The solidification process of high boron wear resistant alloy was studied,and the effects of manganese on its structure and mechanical properties were studied.The results show that the high boron wear resistant alloys consist of dendrite structure and eutectic structure.In the solidification,the former is primary austenite dendrite while the latter is(γ+boride)eutectic.During the cooling process,these austenite transforms into martensite,ferrite and retained austenite.With the increase of manganese content,the volume fraction of dendritic structure decreases,the boride changes little.Mn is mainly enriched in the edge of boride and dendrite,there are retained austenite in the alloy,but its wear resistance can reach 10.8 times than that of NM500 were resistant steel.

关 键 词：高硼铁基合金 凝固 锰 硼化物 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG142.72[金属学及工艺—金属材料]