The Effect of Oxygen Partial Pressure on Heat Transfer and Solidification
The effect of oxygen partial pressure (PO2) in different gas atmospheres on heat transfer,cast structure and econdary dendrite arm spacing in droplet solidification process has been investigated. It has been found that the PO2 of the gas affects solidification process and undercooling. As PO2 decreases, at relatively high PO2 (10 -1.2 ～10 -4 ) in 99.99％ Ar and air atmosphere, heat flux is decreased and equiaxed zone ratio and secondary arm spacing are found to be increased. At intermediate PO2 (10 -14 to 10 -20 ) in Ar-H2 atmospheres, heat flux and equiaxed zone ratio varies only slightly and secondary arm spacing is reduced. At low PO2 (10 -20 ～10 -23 ) in Ar-5％H2 atmosphere, heat flux increases dramatically and the equiaxed zone ratio and secondary arm spacing are reduced. The largest equiaxed zone is found with intermediate PO2 levels in Ar-H2 gas atmospheres, whereas the finest grains are obtained in Ar-5％H2 gas in low PO2 value.
heat flux gas atmosphere oxygen partial pressure solidification strip casting
Yan Yu Yuan Fang Jian Cui Alan W. Cramb Robert Heard
Carnegie Mellon University;5000 Forbes Ave.;Pittsburgh, PA 15213, USA;Baoshan Iron and Steel Researc Baoshan Iron and Steel Research Institute, 655 Fujin Road, Baoshan District, Shanghai, 201900,P. R C Rensselaer Polytechnic Institute, 110 8th St, Troy, NY 12180-3590, USA Carnegie Mellon University;5000 Forbes Ave.;Pittsburgh, PA 15213, USA
国际会议
辽宁
英文
2006-10-21（万方平台首次上网日期，不代表论文的发表时间）