GH4169合金凝固过程中Nb偏析的计算  

Measurement of Nb Segregation in GH4169 Superalloy During Solidification

作　　者：刘艳梅[1] 孙文儒[2] 陈国胜[3] 王铁钢[1] LIU Yanmei;SUN Wenru;CHEN Guosheng;WANG Tiegang(Tianjin University of Technology and Education, Tianjin Key Laboratory of High Speed Cutting and Precision Processing,Tianjin 300222,China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning 1100162,China;Special Steel branch, Baoshan Iron & Steel Co., Ltd., Shanghai 201900,China)

机构地区：[1]天津职业技术师范大学天津市高速切削与精密加工重点实验室,天津市300222 [2]中国科学院金属研究所,辽宁沈阳110016 [3]宝山钢铁股份有限公司特殊钢事业部,上海市201900

出　　处：《有色冶金设计与研究》2017年第6期54-56,共3页Nonferrous Metals Engineering & Research

基　　金：国家自然科学基金资助项目(51301181);天津市应用基础与前沿技术研究计划(15JCZDJC39700);天津市科技特派员项目(16JCTPJC49500);天津市高等学校创新团队培养计划项目(TD12-5043)

摘　　要：采用一种新的方法,研究了GH4169合金真空自耗工业铸锭中Nb的偏析。采用金相定量分析和电子探针显微分析方法研究了微观组织和元素分布,其中枝晶轴相质量分数约为65%、其Nb含量约为2.4%。枝晶轴凝固结束时,剩余液相中Nb含量约为10.9%。此时,枝晶间相开始析出,其中Nb含量随着凝固的进行逐渐升高。最后,当剩余液相质量分数约为5.8%时,Laves/γ共晶反应发生,凝固过程结束。The segregation of Nb in GH4169ingot was analyzed in a new way.The composition and area fraction of various phases were measured by electron microprobe and metallographic image analysis.It was determined by calculation accordingly that the weight percentage of the dendrite core is about65%,and Nb concentration at the core is2.4%.After the finishing of the dendrite core solidification,the Nb concentration in the residual liquid is10.9%,and the Nb concentration in phase gradually increases,forming the interdendritic area.When the amount of the residual liquid is reduced to about5.8%,the Laves/γeutectic reaction takes place,which terminates the solidification of GH4169alloy.

关 键 词：GH4169 凝固 偏析 定量分析 

分 类 号：TG132[一般工业技术—材料科学与工程]