Solidification structure simulation and casting process optimization of GCr15 bloom alloy  

作　　者：Jie Li Hao-tian Wu Yang Liu Yan-hui Sun 

机构地区：[1]Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《China Foundry》2022年第1期63-74,共12页中国铸造（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51774030 and U1860104);the Fundamental Research Funds for the Central Universities(FRF-TP-20-029A1)。

摘　　要：Based on the solidification heat transfer model and CAFÉmodel,the solidification structure of GCr15 bloom alloy was studied.Using nail shooting and acid etching experiments,the solidification models were verified.The secondary dendrite arm spacing(SDAS)model of GCr15 was obtained by simulation calculation and metallographic observation.With the increase of casting speed,the SDAS,equiaxed crystal ratio(ECR)and average grain size increase.With the rise of superheat,the SDAS increases in the 20-70 mm of thickness and decreases in the 80-160 mm of thickness.The ECR decreases and the average grain size increases with the increase of superheat.With the increase of specific water flow,both the SDAS and ECR decrease.The minimum average grain size is obtained when the specific water flow is 0.20 L·kg^(-1).The central carbon segregation index is reduced from 1.11 to 1.075.

关 键 词：numerical simulation continuous casting equiaxed crystal ratio secondary dendrite arm spacing carbon segregation 

分 类 号：TG142[一般工业技术—材料科学与工程]