锆对急冷凝固FGH96合金粉末显微组织和元素偏析的影响  

Effect of Zr on microstructure and microsegregation of FGH96 superalloy powders by quench solidification

作　　者：胡鹏辉[1] 刘国权[1,2] 马文斌[1] 胡本芙[1] 张义文[3] 刘建涛[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京科技大学新金属材料国家重点实验室,北京100083 [3]北京钢铁研究总院高温研究所,北京100081

出　　处：《粉末冶金材料科学与工程》2012年第6期694-699,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2010CB631204)

摘　　要：采用金相显微镜(OM)、扫描电镜(SEM)及其附带的能谱仪,对不同Zr含量的急冷凝固FGH96合金粉末的显微组织、热学凝固参数和枝晶间合金元素偏析进行研究。结果表明:通过调整Zr含量,可以改变粉末颗粒内部树枝晶、胞状长大晶和微晶凝固组织的比例;粉末凝固组织形态主要取决于冷却速率T-、固液界面前沿温度梯度G和长大速度R;不同Zr含量的FGH96合金粉末颗粒中,Mo、Nb、Ti、Zr等元素富集于枝晶间,Co、Cr、W和Ni富集于枝晶轴,随Zr含量增加,Ti、Nb、Zr等元素的枝晶偏析程度减小。The effects of Zr content on the microstructure, thermal solidification parameters and dendrite microsegregations were investigated for FGH96 superalloy powders by OM, SEM and EDS. The results show that the Zr content can change the proportion among dendrite,cellular and microcrystal structure. The microstructure of superalloy powder mainly depends on the cooling rate T, the thermal gradient G and the growing velocity R all along the solid/liquid interface. There are riched with Mo, Ti, Nb, Zr elements between dendrite arm and riched with Co, Cr, W, Ni elements in dendrite axis in FGH96 superalloy powders with different Zr contents. The dendrite microsegregation of Ti, Nb, Zr elements decreases with increasing Zr content.

关 键 词：锆 FGH96粉末 显微组织 枝晶偏析 

分 类 号：TG132.3[一般工业技术—材料科学与工程]