金属加工（热加工）Issue(9)：112-118,7.
冷冻砂型对铸铁合金凝固行为及组织性能影响规律研究
Effect of frozen sand mold on solidification behavior and microstructure of cast iron
摘要
Abstract
The interfacial heat transfer coefficient of cast iron is an important parameter to reflect the heat transfer degree between the frozen sand cast iron alloy and cast iron alloy,which is of great significance for the analysis of microstructure properties of cast iron alloy.In this study,the change rule of the interfacial contact temperature of the alloy with time was measured.Based on this,the characteristics of the interfacial heat transfer were analyzed,and the function of the interfacial heat transfer coefficient changing with the initial interfacial temperature was obtained.Meanwhile,the as-cast microstructure and mechanical properties of the castings solidified in the frozen sand mold were analyzed.The results show that the interfacial heat transfer coefficient decreases with the increase of the initial temperature of the frozen sand mold,and increases with the decrease of water content.At the initial freezing temperature of-35℃,-30℃and-25℃with moisture content of 6wt.%,the peaks of interface heat transfer coefficients of cast castes are 195663W/(m2·K),147933W/(m2·K)and 120836W/(m2·K).At the initial freezing temperature of-35℃,-30℃and-25℃with moisture content of 5wt.%,the peaks of interface heat transfer coefficients of cast castes are 209257W/(m2·K),176878W/(m2·K)and 134472W/(m2·K).Under the same moisture content,the lower the initial freezing temperature,the finer the pearlite grain,the higher the graphitization degree and the higher the tensile strength.关键词
冷冻砂型/铸铁合金/界面换热系数/初始温度/含水率Key words
frozen sand mold/cast iron/interfacial heat transfer coefficient/initial temperature/moisture content引用本文复制引用
戴宇峰,单忠德,杨浩秦,罗磊,梁校..冷冻砂型对铸铁合金凝固行为及组织性能影响规律研究[J].金属加工（热加工）,2024,(9):112-118,7.基金项目
国家重点研发计划(2021YFB3401200) （2021YFB3401200）
江苏省基础研究计划(自然科学基金)青年基金(BK20230885). （自然科学基金）
