HOT TEARING OF ALUMINUM ALLOYS: INFLUENCE OF INTERMETALLIC COMPOUNDS CRYSTALLIZATION AT LATER STAGE OF SOLIDIFICATION
Hot tearing in direct-chill casting is one of the most serious problems to disturb the productivity in aluminum processing. To prevent hot tearing many researches have been made both in experimental and theoretical points of views. In spite of these efforts cracking, or hot tearing, during casting can happen, especially in newly developed alloys with higher strength. Therefore simulation technique through a deep understanding for hot tearing behavior is highly expected. In this research the crack susceptibility of aluminum alloys was discussed in relation to intermetallic compounds formation at later stage of solidification. High temperature tensile testing during solidification was performed for high strength Al-Mg-Si alloys and 2xxx alloys with high content of Sn. Solidification path was analyzed to elucidate formed phases during solidification by both interrupted solidification experiment and calculation of thermodynamic data- base. Iron content in Al-Mg-Si alloys severely influenced the hot tear due to iron bearing compound formation; beyond 0.20％ Fe hot tear was easily occurred. Mn and Cr in 2xxx alloys which were important to the grain refinement in extrusion assisted the crack due to the compound formation.
Hot tearing Intermetallic compound Direct chill casting
NAGAUMI Hiromi UMEDA Takateru
Nikkei Research & Development Center, Nippon Light Metal Co., Ltd., Shizuoka, JAPAN Department of Metallurgical Engineering, Chulalongkorn University, Bangkok, THAILAND
国际会议
大连
英文
569-576
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）