过热度对60Si2MnA弹簧钢连铸坯凝固组织的影响

来源期刊：钢铁2010年第12期

论文作者：敖鹭 仲红刚 陈湘茹 宋长江 翟启杰

文章页码：68 - 72

关键词：弹簧钢； 过热度； 凝固组织； 碳宏观偏析

Key words：spring steel； superheat degree； solidification structure； carbon macro-segregation

摘    要：通过铸坯凝固组织生长单元的物理模拟方法,研究不同过热度对60Si2MnA弹簧钢铸坯凝固组织及宏观偏析规律的影响。结果表明:试验模拟的铸坯组织的等轴晶比例和晶粒尺寸与数值模拟和实际生产铸坯的组织相近,表明试验模拟可以很好地反映实际铸坯组织。随着浇注温度升高,柱状晶区长度增加,相应的等轴晶区长度降低。同时,凝固过程中有比较严重的碳宏观偏析,初始凝固区表现为负偏析,凝固末端表现为正偏析。过热度越高,凝固末端的正偏析越严重。

Abstract: Physical simulation about the crystal growth of the continuous casting solidification unit was done to study the influence of superheat degree on solidification structure and carbon macro-segregation of 60Si2MnA spring steel.Compared with numerical simulation and actual solidification structure,the solidification structure of the experimental simulation has similar area ratio of equiaxed structure and grain size,the experimental results indicate that experimental simulation solidification structure is in agreement with actual one.With increase of the superheat,the columnar length increases and equiaxed length decreases.In addition,the 60Si2MnA spring steel presents carbon negative segregation at the initial solidification zone and positive segregation at the end solidification zone in the process of solidification,and carbon positive segregation is found to be more severe with superheat degree increasing.