摘要
增材制造技术为发展高性能高温合金材料及部件提供了新的途径。本工作开发一种适于增材制造工艺条件的γ′相强化CoNi基高温合金,并结合电子束熔化(electron beam melting,EBM)技术的工艺参数优化,制备出无裂纹的合金块体材料。结果表明:扫描速度为2000 mm/s时,合金孔隙率最低,约为0.14%;打印态CoNi基合金显微组织为沿<001>方向生长的柱状晶粒,平均晶粒宽度约为235μm,γ′相体积分数约为30%;经过热等静压及固溶时效处理后,孔隙率进一步降低至约0.09%,柱状晶粒基本没有变化;γ′相的平均尺寸为(70±18)nm,体积分数为(32±3.6)%。室温拉伸实验结果表明,增材制造γʹ相强化CoNi基高温合金展示出优异的强塑性配合,展示出良好的工业应用前景。
Additive manufacturing provides a new way to develop high-performance superalloys and components.Aγ′-strengthened CoNi-base superalloy suitable for additive manufacturing was developed,and a crack-free block material was prepared by optimizing the parameters of electron beam melting(EBM)technology.The experimental results show that the lowest porosity of the alloy is about 0.14%when the scanning speed is 2000 mm/s.The microstructures of the as-printed CoNi-base alloy are columnar grains growing along the<001>direction,the average grain width is about 235μm,and the volume fraction ofγ′phase is about 30%.After hot isostatic pressing and solution aging treatment,the porosity of the alloy is further reduced to about 0.09%with unobvious change of columnar grains.The average size ofγ′phases is about(70±18)nm with the volume fraction of about(32±3.6)%.The results of room temperature tensile tests show that the additive manufacturedγʹ-strengthened CoNi-base superalloy exhibits excellent strength and ductility,showing a good potential of industrial application.
作者
李龙飞
喻遥
闫春雷
冯强
LI Longfei;YU Yao;YAN Chunlei;FENG Qiang(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China)
出处
《航空材料学报》
CAS
CSCD
北大核心
2024年第2期125-132,共8页
Journal of Aeronautical Materials
基金
国家重点研发计划项目课题(2022YFB3707104)
国家自然科学基金(92060113)。
关键词
CoNi基高温合金
增材制造
裂纹敏感性
显微组织
力学性能
CoNi-based superalloy
additive manufacturing
cracking susceptibility
microstructure
mechanical property