U.S.-China Cooperative Research (Materials Science): Casting Defect Formation Including Hot Tearing

这是密歇根大学材料科学与工程系罗伯特·D·佩尔克与哈尔滨工业大学金属材料与技术系铸造科李庆春为期两年的合作研究项目，哈尔滨，中国。该项目由美国国家科学基金会和哈尔滨工业大学联合赞助。该研究计划将重点放在铸件中的缺陷形成上，重点放在热裂上。将讨论几个前线研究问题，包括(1)抗压和GT的测量；(2)湿砂和干砂的强度/阻力的测量；(2)砂/金属界面摩擦行为的定量估计或测量；(3)确定/估计更准确的断裂或撕裂标准；(4)在绝对熔化温度80%及以上时测量铸造合金的力学性能。断裂标准的评估将在密歇根大学进行，选定合金的高温机械性能测试将在哈尔滨工业大学进行研究。其他问题，如高温砂的性质和砂/金属界面的摩擦行为，将由两个机构的小组共同承担。该项目的目标是为密歇根大学自1979年以来在NSF支持下在铸件计算机辅助设计领域进行的一项重大研究活动做出贡献。这项研究还将为哈尔滨工业大学正在进行的研究做出贡献。

This is a two.year collaborative research project between Robert D. Pehlke of the Department of Materials Science and Engineering, University of Michigan, and Li Qingchun of the Casting Division of the Department of Metallic Materials and Technology of the Harbin Institute of Technology, Harbin, China. The project is sponsored jointly by NSF and the Harbin Institute of Technology. The research program will focus on defect formation in castings with an emphasis on hot tearing. Several front.line research issues will be addressed, including (1) measurements of compressive >strength/resistance of green and dry sands; (2) quantitative estimates or measurements of frictional behavior at the sand/metal interface; (3) >determination/estima>tion of more accurate fracture or tearing criteria; and (4) mechanical property measurements of casting alloys at and above 80 percent of the absolute melting temperature. The assessment of fracture criteria would be undertaken at the University of Michigan, and the high temperature mechanical property measurements for selected alloys would be studied at the Harbin Institute of Technology. The other issues of high temperature sand properties and the frictional behavior at the sand/metal interface would be jointly undertaken by groups at both institutions. The goal of this project is to contribute to a major research activity conducted at the University of Michigan with NSF support since 1979 in the field of computer.aided design for castings. The research will also contribute to ongoing research at the Harbin Institute of Technology.