双金属复合铸造界面结合技术与机理研究  

Study on Technologies and Mechanisms of Obtaining a High-Quality Metallurgical Bond Between Dissimilar Metals During a Cast-On Process

作　　者：韩青有 隋大山 刘兴涛 孙东科[1] HAN Qing-you;SUI Da-shan;LIU Xing-tao;SUN Dong-ke(School of Mechanical Engineering,Southeast University,Nanjing 211189,Jiangsu,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]东南大学机械工程学院,江苏南京211189 [2]上海交通大学材料科学与工程学院,上海200030

出　　处：《铸造》2024年第1期1-8,共8页Foundry

摘　　要：目前常用的复合铸造方法难以制造出具有优质冶金结合的双金属铸件。采用康明斯技术研究钢棒和铝铸件结合,系统研究了工艺参数和超声辅助技术对钢铝双金属冶金结合质量的作用规律。试验结果表明,工艺参数对冶金结合的质量有着显著的影响。使用高强超声波辅助复合铸造技术时,即使使用钢棒和未经除气处理的铝合金液,仍能制备出具有高质量冶金结合的双金属复合铸件。结合数值模拟技术,探索了复合铸造过程中双金属界面气隔形成的原因和冶金结合形成条件,提出了获得优质冶金界面结合的物理、热力学和动力学条件。Conventional cast-on processes are difficult to use for making bimetal castings of high-quality metallurgical bonding between dissimilar metals.This article describes a study using Cummins process for making a bimetal aluminum casting locally reinforced by a steel bar.A systematic test was carried out to investigate the influence of casting parameters and ultrasound-assisted techniques on the bonding quality and their working mechanisms.The research results indicated that casting parameters could significantly affect the quality of the metallurgical bonding.When high-intensity ultrasound was used to assist the cast-on process,high-quality metallurgical bonding could be obtained even though the aluminum melt was not degassed and the steel bar was not coated,i.e.a bare steel bar.Numerical simulation was performed to investigate the mechanisms of gap formation and the formation conditions of the metallurgical bond.Physical,thermodynamic,and kinetic conditions for the formation of a high-quality metallurgical bond were described.

关 键 词：复合铸造 冶金结合 铸造缺陷 数值模拟 

分 类 号：TG249[金属学及工艺—铸造]