灰铁凝固过程中缩孔缩松的预测  

PREDICTION OF SHRINKAGE CAVITY AND POROSITY IN GRAY CAST IRON DURING SOLIDIFICATION

作　　者：杨杰[1,2] 董怀宇[1,2] 熊守美[1,2] 

机构地区：[1]清华大学机械工程系,北京100084 [2]清华大学先进成形制造重点实验室,北京100084

出　　处：《金属学报》2005年第9期929-932,共4页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划资助项目G2000067208-3

摘　　要：通过热分析实验及对灰铁试件的浇注实验,分析了碳当量及孕育对灰铁凝固过程的影响.在动态膨胀叠加法的基础上,综合考虑了初始温度、碳当量、孕育、初晶和共晶体积的收缩与膨胀,建立了灰铁缩孔预测模型.开发了灰铁凝固过程数值模拟分析系统,并对实际的灰铁浇注件进行验证分析,预测结果与实验结果吻合较好.The effects of carbon equivalent and inoculation on solidification process of gray cast iron were studied by thermal analysis experiments and pouring experiments of gray iron castings. Based on the dynamic expansion and contraction accumulation method, a shrinkage prediction model of gray cast iron was developed, in which the pouring temperature, carbon equivalent and inoculation were comprehensively considered. Besides, all the volume variations during solidification process, such as the contraction of melt, the contraction or expansion of primary graphite or austenite and eutectic phase, were taken into consideration during computation. A numerical simulation system especially for the solidification process of gray iron castings was developed and used to analyze the solidification process of practical gray iron castings. The simulation results are consistent with the experimental ones.

关 键 词：灰铁 凝固 缩孔缩松 预测模型 数值模拟 

分 类 号：TG242[金属学及工艺—铸造]