铸造技术2018，Vol.39Issue(1)：25-30,6.DOI:10.16410/j.issn1000-8365.2018.01.006
硫代硫酸钠模拟制备大型复合铸锭工艺研究
Simulation of Casting Large Clad Ingots Using Na2S2O3· 5H2O as Melt
摘要
Abstract
The solidification speed and nucleation rate can be significantly improved by absorbing the latent heat during the solidification of molten metal when a rolled or forged core material of the low temperature was presented in the mould.This leaded to the significant refinement of solidification structures,especially for large ingot.A clad casting experiment was carried out using sodium thiosulfate as solidification medium and using solid sodium thiosulfate round bar as core material.The effect of low temperature core bar on the solidification process,solidification rate and structures of sodium thiosulfate melt was investigated.The results show that the solidification rate of the melt is significantly improved by the addition of solid core bar.The solidification rate reach 6.80 g/min under the condition of a core bar and the solidification rate is only 4.60 g/min without core bar after 30 min.The solidification rate of the two cases is approximately equal to 4.44 g/min at 53 min.At this point,the solidification percentage of the melt reaches 62％ with core bar and the solidification percentage is only 37％.Additionally,the average grain size of the solidification structures decreases from 5.33 mm to 2.66 mm and the central shrinkage reduce by 5.4％ due to the core bar cast in ingot,so the core quality of ingot is improved obviously.关键词
复合铸锭/凝固/硫代硫酸钠/模拟/形核率Key words
clad ingot/solidification/Na2S2O3·5H2O/simulation/nucleation rate分类
矿业与冶金引用本文复制引用
张磊,井玉安,罗德维,代自莹,宋华,沙明红..硫代硫酸钠模拟制备大型复合铸锭工艺研究[J].铸造技术,2018,39(1):25-30,6.基金项目
辽宁省创新团队“节能环保冶金新工艺及装备开发”项目资助(LT2015014) （LT2015014）
