熔体处理对DD426单晶高温合金凝固组织的影响  

Effect of Melt Treatment on Solidification Microstructures in DD426 Single Crystal Superalloy

作　　者：黄亚奇 张金 刘栋 郑伟[1] 申健[1] 王栋[1] 谢光[1] 卢玉章[1] HUANG Ya-qi;ZHANG Jin;LIU Dong;ZHENG Wei;SHEN Jian;WANG Dong;XIE Guang;LU Yu-zhang(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;Sate Key Laboratory of Advanced Equipment Casting Technology,Shenyang Foundry Research Institute Co.,Ltd.,China Academy of Machinery Science and Technology,Shenyang 110022,Liaoning,China;AECC Guiyang Engine Design Research Institute,Guiyang 550081,Guizhou,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳110016 [2]中国机械总院集团沈阳铸造研究所有限公司高端装备铸造技术全国重点实验室,辽宁沈阳110022 [3]中国航发贵阳发动机设计研究所,贵州贵阳550081

出　　处：《铸造》2024年第8期1073-1082,共10页Foundry

基　　金：哈尔滨工业大学金属精密热加工国家级重点实验室项目(JCKYS2022603C008);国家重点研发计划项目(2021YFB3702900、2021YFA1600603、2022YFB3705000);辽宁省科学技术计划项目(2022JH2/101300226)。

摘　　要：通过不同熔体处理工艺制备第一代单晶高温合金DD426,结合差热分析和JMatPro模拟计算确定合金的凝固路径以及凝固特征温度,采用扫描电子显微镜观察不同工艺制备样品的微观组织,并借助X射线三维断层扫描技术表征样品中的显微孔洞。结果表明,随着熔体处理温度的升高,结晶温度区间先降低后增加,一次/二次枝晶间先降低后增加;碳化物的形貌主要取决于合金成分(碳元素和碳化物形成元素)和凝固条件(生长空间和生长时间);合金中显微孔洞的尺寸、数量、分布受到枝晶间距和碳化物含量和形态的影响。The first generation single crystal superalloy DD426 was prepared by different melt treatment processes.The solidification path and solidification characteristic temperature of the alloy were determined by combining differential thermal analysis and JMatPro simulation calculation.The microstructure of the samples prepared by different processes was observed by scanning electron microscopy,and the micro-pores in the samples were characterized by three-dimensional X-ray computed tomography.The results showed that with the increase of melt treatment temperature,the crystallization temperature decreased firstly and then increased,leading to the change of primary/secondary dendrite arm spacing.The morphology of carbides mainly depended on the alloy composition(carbon element and carbide forming element)and solidification conditions(growth space and time).The size,quantity and distribution of micro-pores in the alloy were affected by dendrite spacing,carbide content and morphology.

关 键 词：金属材料 单晶高温合金 熔体处理 碳化物 显微孔洞 

分 类 号：TG132.3[一般工业技术—材料科学与工程]