铸造中碳钢钢锭凝固组织的数值模拟
Numerical Simulation Study on Solidification Micro structure of Cast Steel Ingot
李吉林 1伍伟 1冯俊宁1
作者信息
- 1. 北方民族大学材料学院,宁夏银川 750021
- 折叠
摘要
使用CAFE方法模拟了铸造中碳钢钢锭的凝固组织,确定了适用于砂型铸造中碳钢钢锭凝固组织数值模拟的相关参数,主要包括形核密度(n)、形核过冷度(ΔT)及枝晶尖端生长动力学参数(a2,a3).在此基础上,对比分析了形核和长大过程参数对数值模拟结果的影响,发现在面形核过冷度(ΔTs,max)不变的情况下,提高体形核过冷度(ΔTb,max)会显著增加钢锭组织中柱状晶的比例;在形核参数不变的前提下,增大a2和a3,也会显著扩大柱状晶区的面积;对不同冷却条件下的钢锭凝固组织的数值模拟结果表明,随着冷却速度的加快,钢锭组织中柱状晶的数量明显增加.
Abstract
The solidification microstructures of a cast medium carbon steel ingot were simulated using the CAFE method,and relevant parameters including the nucleation density(n),the nucleation undercooling(ΔT)and the dendrite tip growth kinetics parameters(a2,a3),which suitable for the numerical simulation of the soidification microstructure of sand-casting medium carbon steel ingot,were determined.On this basis,the influnces of different nucleation and growth parameter conditions on the numerical simulation results were compared and analyzed.It was observed that when the surface nucleation undercooling(ΔTs,max)was kept constant,the columnar crystal region expanded as the bulk nucleation undercooling(ΔTb,max)increased;when the nucleation parameter conditions were kept constant,increasing the values of a2 and a3 also led to an expansion of the columnar crystal region;the numerical simulation results of the solidification microstructures of the cast steel ingots under the conditions of different cooling rates showed that the quantities of the columnar crystals increased as the cooling rate was increased.
关键词
凝固组织/数值模拟/晶粒形核/枝晶长大Key words
solidification microstructure/numerical simulation/grain nucleation/dendrite crystal growth引用本文复制引用
基金项目
北方民族大学中央高校基本科研业务费专项资金(2022XYZCL01)
出版年
2024
国家科技期刊平台
NSTL
万方数据