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

作　　者：任吉 燕云[2] 田家龙 王礼超 蒋成钢 王琳[2] 姜周华 Ren Ji;Yan Yun;Tian Jialong;Wang Lichao;Jiang Chenggang;Wang Lin;Jiang Zhouhua(School of Metallurgy,Northeastern University,Shenyang 110819,China;Technical Center of Fushun Special Steel Co.,Ltd,Fushun 113001,China)

机构地区：[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

出　　处：《特殊钢》2024年第4期117-123,共7页Special Steel

基　　金：辽宁省科学技术计划项目“揭榜挂帅”(科技攻关专项)(2023 JH1/10400051)。

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Al_(2)O_(3)和MnS;当H13钢中w[La]为0.016%时,钢中夹杂物以La_(2)O_(2)S为主;当w[La]为0.045%和0.073%时,钢中夹杂物主要为LaP和La_(2)O_(2)S。热力学计算表明,在1600℃下钢液中,La处理后夹杂物的转变过程为Al_(2)O_(3)→LaAlO_(3)→La_(2)O_(2)S。在凝固过程中,钢液中首先析出La_(2)S_(3),当温度继续降低,LaP开始在La_(2)S_(3)和La_(2)O_(2)S表面析出,最终形成复合夹杂物La_(2)O_(2)S-LaP和La_(2)S_(3)-LaP。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 protection.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 Al_(2)O_(3) and MnS.However,with a La content of 0.016%in H13 steel,the dominant inclusions shift to La_(2)O_(2)S.When the La content in H13 steel is 0.016%,the inclusions in the steel are mainly La_(2)O_(2)S;Furthermore,when the La content reaches 0.045%and 0.073%,the predominant inclusions in steel become LaP and La_(2)O_(2)S.Thermodynamic calculations show that the transformation process of La-treated inclusions is Al_(2)O_(3)→LaAlO_(3)→La_(2)O_(2)S in molten steel at 1600℃.During the solidification process,La_(2)S_(3) is initially precipitated in the molten steel.As the temperature continues to decline,LaP begins to precipitate on the surface of La_(2)S_(3) and La_(2)O_(2)S,ultimately forming the composite inclusions La_(2)O_(2)S-LaP and La_(2)S_(3)-LaP.

关 键 词：H13热作模具钢 La处理 夹杂物 热力学计算 

分 类 号：TG142[一般工业技术—材料科学与工程]