NUMERICAL MODELING OF ELECTRON BEAM MELTING AND CASTING OF Ti-6A1-4V ALLOY INGOT
The electron beam cold hearth remelting (EBCHR) and the associated casting or consolidation process is emerging as one of the industrially important technology for the production of high quality titanium alloys. In order to better understand the effects of processing parameters on the mushy zone profile and sump depth during electron beam (EB) casting process of Ti-6A1-4V ingots, a numerical method has been developed, in which fluid flow and heat transfer are coupled based on the direct finite difference method (DFDM) via using a commercial software package, JSCAST, as a platform. The thermal energy input of electron beams on the top of ingot is accounted based on a Time-Averaging Scheme. Further, the buoyancy driven natural convection, the Darcy friction in the mushy zone and the radiation cooling are also considered in the model. The comparison between numerical results and plant trials has been performed and key parameters on the mushy zone will be discussed in the paper. Further, numerical modeling of the final transient state solidification has also been carried out. It was found that the asymmetric formation of voids in the ingot is linked with the asymmetric solidification during the final transient state, and Niyama criterion agreed quite well with the locations of voids observed in the ingot.
titanium alloy electron beam casting modeling steady state final transient state
Jindong ZHU Daan Maijer Steven Cockcroft Xuanhe ZHAO David Tripp Stephen Fox
Department of Materials Engineering, University of British Columbia Vancouver, B.C. Canada V6T 1Z4 Titanium Metals Corporation, Morgantown, PA, USA 19543 Titanium Metals Corporation, Henderson, NV, USA 89009
国际会议
大连
英文
201-209
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）