B对球铁凸轮轴珠光体体积分数的影响  

Effect of Boron on Pearlite Volume Fraction of Nodular Iron Camshaft

作　　者：张昊 李莉 沈保罗[1,2] 何勇 钟寻 曾祥 刘建刚 

机构地区：[1]成都金顶精密铸造有限公司,四川成都611330 [2]四川大学 材料科学与工程学院,四川成都610064

出　　处：《现代铸铁》2014年第2期27-29,共3页Modern Cast Iron

摘　　要：采用统计分析方法研究了w(B)量对2种球铁凸轮轴中珠光体体积分数的影响。结果发现,尽管统计数据存在较大的分散性,但从数据的趋势可见,随着w(B)量的增加,球铁凸轮轴中的珠光体体积分数降低,铁素体体积分数增加。分析认为,由于B的存在,凝固过程中球状石墨周围会析出Fe23(C,B)6,促使C向石墨扩散,导致基体中w(C)量降低而形成铁素体,因而使珠光体体积分数降低。By using statistic method,the effect of boron content on pearlite volume fraction of two models of nodular iron camshafts was investigated. As the result,it was found that,although the statistic data had quite big dispersion,however the tendency of the data indicated that,with increasing of the boron content,the pearlite volume fraction of the nodular iron camshafts decreased,antheir ferrite volume fraction increased. It was considered by analysis that the boron existing may cause Fe23（C, B ）6 precipitating and promoted the carbon diffuse onto graphite and leaded to the carbon content of matrix decreasing and thereby caused ferrite formation and therefore caused pearlite volume fraction decreasing.

关 键 词：球墨铸铁 凸轮轴 B 珠光体 

分 类 号：TG255[金属学及工艺—铸造]