12Cr2Mo1R钢水冷大扁锭凝固过程Z向晶粒分布  

Numerical simulation of grain distribution in 12Cr2Mo1 Rsteel water-cooled ingot along Z-direction during solidification process

作　　者：李茂旺[1] 孟庆勇[2] 李永亮[2] 王福明[2] 

机构地区：[1]江西冶金职业技术学院,江西新余338015 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼钢》2015年第4期68-71,78,共5页Steelmaking

基　　金：国家自然科学基金(51374018)

摘　　要：采用CAFE模型计算了12Cr2M01R钢铸锭凝固过程厚度方向（Z向）晶粒分布状况，考察了冷却强度和变质处理对晶粒分布状况的影响。结果表明：50-800W／（m^2·K）冷却强度范围内，增加冷却强度有利于柱状晶的生长；冷却强度大于800W／（m^2·K）对柱状晶对的生长促进作用明显减弱；冷却强度对中心等轴晶区晶粒分布基本无影响。通过添加异质形核剂变质处理的方法，不仅能抑制柱状晶的生长，还能细化中心等轴晶区晶粒。CAFE model was applied to investigate grain distribution in 12Cr2MolR steel water-cooled ingot along Z-direction, and cooling intensity and heterogeneous nucleation parameters were specially considered. The results showed that with the increase of cooling intensity, the width of columnar crystal was enlarged when the cooling intensity was between 50 and 800 W/（m^2 K）. In contrast, the degree of the width increase of columnar crystal by raising cooling intensity was weakened, when cooling intensity was greater than 800 W/（m^2 K）. However, the cooling intensity has little effect on grain distri- bution in central equiaxed zone. The growth of columnar crystal was restrained and the grain in central equiaxed zone was refined by adding nucleating agent.

关 键 词：晶粒分布 CAFE模型 Z向 冷却强度 异质形核 

分 类 号：TG261[金属学及工艺—铸造]