熔体保温时间对含硅蒙乃尔合金组织与硬度的影响  

Effects of Melt Holding Time on Microstructure and Hardness of Silicon Monel Alloy

作　　者：邹军涛[1] 雷春娟[2] 洪波[1] 杨晓红[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]九江学院土建学院,江西九江332005

出　　处：《热加工工艺》2013年第15期22-25,共4页Hot Working Technology

基　　金：陕西省科技统筹创新计划项目(2012KTCQ01-14);陕西省科学研究计划(2013JM6001)资金资助

摘　　要：在真空条件下制备了含硅蒙乃尔合金,采用OM、SEM、TEM与XRD研究了该合金铸态组织特征以及熔体保温时间对含硅蒙乃尔合金硬度的影响。结果表明:合金铸态组织由树枝状α固溶体基体、弥散分布于基体的次生β相及枝晶间呈网状分布的α+β共晶相组成;随着熔体保温时间延长,合金组织中枝晶尺寸先减小后增大,α+β共晶相先减少后增多;合金硬度随保温时间延长呈现出先升高后降低趋势;熔体保温60 min时,合金组织中枝晶尺寸最为细小,α+β共晶相含量最少,合金的硬度达372 HB的最高值。Silicon Monel alloy was melted under the vacuum condition, and the microstructure characteristics of the as-cast alloy and the effect of melt-holding time on the microstructure and hardness of silicon monel olloy were researched by using OM, SEM, TEM and XRD. The results show that as-cast microstructure consists of primary dendriticα solid solution, secondary β phase distributed in the matrix and eutectic α＋βof mesh distribution in the interdendritic; with the increase of melt holding time, the size of dendrites in silicon Monel alloy firstly decrease then change big, and the amount of eutectic α＋βphase firstly decrease then increase; the hardness of the alloy has an obvious trend of which firstly increases then decreases; when the holding time is 60 min, the alloy has the finest dendrites, the least amounts of eutectic α＋βphase and the highest hardness of 372 HB.

关 键 词：蒙乃尔合金 熔体 共晶相 次生相 

分 类 号：TG135.1[一般工业技术—材料科学与工程] TG27[金属学及工艺—合金]