La处理对H13热作模具钢中夹杂物的影响
Effect of La Treatment on Inclusions in H13 Hot Work Die Steel
任吉 1燕云 2田家龙 1王礼超 1蒋成钢 1王琳 2姜周华1
作者信息
- 1. 东北大学冶金学院,沈阳 110819
- 2. 抚顺特殊钢股份有限公司技术中心,抚顺 113001
- 折叠
摘要
采用真空感应炉熔炼H13模具钢,在氩气保护下加入稀土镧处理钢液并浇铸成钢锭,研究了La处理对H13钢中夹杂物转变的影响.结果表明,La对H13钢中夹杂物具有很好的改性效果,随La含量的提高,夹杂物的数量呈上升趋势,夹杂物的平均尺寸先减小后增大.不添加稀土时,H13钢中夹杂物主要为Al2O3和MnS;当H13钢中w[La]为0.016%时,钢中夹杂物以La2O2S为主;当w[La]为0.045%和0.073%时,钢中夹杂物主要为LaP和La2O2S.热力学计算表明,在1 600℃下钢液中,La处理后夹杂物的转变过程为Al2O3→LaAlO3→La2O2S.在凝固过程中,钢液中首先析出La2S3,当温度继续降低,LaP开始在La2S3 和La2O2S表面析出,最终形成复合夹杂物La2O2S-LaP和La2S3-LaP.
Abstract
The effect of La treatment on the transformation of inclusions in H13 steel was investigated by subjecting H13 die steel to vacuum induction melting and subsequently treating the molten steel with La under an argon atmosphere protec-tion.The results demonstrate that La has a beneficial effect on inclusions in H13 steel,the number of inclusions increases with the increase of La content,while the average size of inclusions initially decreases and then increases.The inclusions in H13 steel without the rare earth La additions are primarily Al₂O₃ and MnS.However,with a La content of 0.016%in H13 steel,the dominant inclusions shift to La2O2S.When the La content in H13 steel is 0.016%,the inclusions in the steel are mainly La2O2S;Furthermore,when the La content reaches 0.045%and 0.073%,the predominant inclusions in steel become LaP and La2O2S.Thermodynamic calculations show that the transformation process of La-treated inclusions is Al2O3→LaAlO3→La2O2S in molten steel at 1 600℃.During the solidification process,La2S3 is initially precipitated in the molten steel.As the temperature continues to decline,LaP begins to precipitate on the surface of La2S3 and La2O2S,ulti-mately forming the composite inclusions La2O2S-LaP and La2S3-LaP.
关键词
H13热作模具钢/La处理/夹杂物/热力学计算Key words
H13 Hot Work Die Steel/La Treatment/Inclusions/Thermodynamic Calculation引用本文复制引用
基金项目
辽宁省科学技术计划"揭榜挂帅"科技攻关专项(2023JH1/10400051)
出版年
2024
NETL
NSTL
万方数据