微量元素对Co基高温合金初熔温度的影响  

EFFECTS OF MINOR ELEMENTS ON INITIAL MELTING POINT IN A COBALT-BASE SUPERALLOY

作　　者：姚向东[1] 张静华[1] 张志亚[1] 李英敖[1] 赵乃仁[1] 管恒荣[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《材料研究学报》1995年第3期237-240,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金

摘　　要：用差热分析法（ＤＴＡ）研究微量元素Ｃ，Ｂ，Ａｌ，Ｚｒ对一种Ｃｏ基高温合金初熔温度的影响，表明微量元素的加入，对熔化温度无明显影响，但导致合金初熔温度明显降低，Ｂ的影响最为显著，Ｃ次之，Ａｌ，Ｚｒ略有影响．并且，用金相探针法研究不同温度下合金的微观组织，发现合金从枝晶间开始熔化，随温度提高，熔化区域向枝晶于扩展，电子探针研究表明微量元素在枝晶间高度富集，用图像分析法定量研究合金的熔化体积百分数随温度的变化规律，确定合金的初熔温度．ＤＴＡ和金相探针法的测定结果十分吻合．Experimental studies by using differential thermal analysis (DTA) and micrograghic electro-probe method (MEM) in a cobalt-base superalloy have been carried out to,establish the critical variation criterion of initial melting point (Ti) changing with minor element contents. It is found that the increasing of all minor element may drop Ti, boron plays the most important role, carbon takes second place and aluminum and zironium have a little effect. Furthermore. MEM studies indicate that alloy melts from midpoint between dentrites because of microsegregation of the minor element, and extends to dentritic axis as temperature is increasing. MEM's analyses have extremtly identical results with DTA's.

关 键 词：初熔温度 高温合金 微量元素 钴 

分 类 号：TG146.16[一般工业技术—材料科学与工程]