熔体超温处理对DD3单晶高温合金二次枝晶间距的影响  

EFFECT OF THE MELT SUPERHEATING TREATMENT ON THE SECONDARY ARM SPACING OF DD3 SINGLE CRYSTAL SUPERALLOY

作　　者：邹敏明[1] 张军[1] 刘林[1] 傅恒志[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《金属学报》2008年第2期155-158,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展计划资助项目2006CB605202~~

摘　　要：研究了不同熔体超温处理温度对DD3单晶高温合金二次枝晶间距的影响,并利用旋转定向测试法测量单晶取向偏离度结果表明,熔体超温处理对单晶取向偏离度和合金枝间溶质元素总含量的影响很小;随熔体超温处理温度由起始凝固温度1500℃升高至1640和1780℃,二次枝晶间距减小,细化率达14%—31%.The secondary arm spacing of DD3 Ni-base single crystal superalloy is studied under different melt superheated temperatures, and the deviation angle of the crystal orientation is determined by rotating orientation XRD （RO-XRD） method. It is shown that the deviation angle of the crystal orientation and total content of solutes in interdendritic area are little affected by the melt superheating treatment. The secondary dendrite arm is refined when the superheating temperature is increased from initial solidification temperature 1500 ℃ to 1640 ℃ and 1780 ℃.

关 键 词：熔体超温处理 NI基单晶高温合金 二次枝晶间距 取向偏离度 

分 类 号：TG132.32[一般工业技术—材料科学与工程]