铸造2024，Vol.73Issue(8)：1073-1082,10.
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
摘要
Abstract
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 micro structure 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Key words
metallic materials/single crystal superalloys/melt treatment/carbides/micro-pores分类
金属材料引用本文复制引用
黄亚奇,张金,刘栋,郑伟,申健,王栋,谢光,卢玉章..熔体处理对DD426单晶高温合金凝固组织的影响[J].铸造,2024,73(8):1073-1082,10.基金项目
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) （JCKYS2022603C008）
国家重点研发计划项目(2021YFB3702900、2021YFA1600603、2022YFB3705000) （2021YFB3702900、2021YFA1600603、2022YFB3705000）
辽宁省科学技术计划项目(2022JH2/101300226). （2022JH2/101300226）
