李梦龙,王福明,陶素芬,李天生,孟庆勇

• 1:北京科技大学钢铁冶金新技术国家重点实验室
• 2:北京科技大学冶金与生态工程学院

摘要(Abstract)：

利用Thermo-Calc热力学软件计算研究YF45MnV钢中MnS的平衡析出规律及凝固过程中各元素的偏析行为对MnS析出的影响。结果表明:MnS平衡初始析出温度为1421℃,初始析出温度随C、Si、Al含量增加而降低,随Mn、S含量增加而升高;Scheil凝固过程中,计算得到Mn、S的平衡分配系数分别为0.70、0.02,二者随着凝固过程进行在剩余液相中不断偏析富集,达到平衡浓度积后析出MnS。真空感应炉冶炼不同S含量(0.025%~0.065%)的实验钢,发现钢中硫化物主要为大量细小II类MnS+少量尺寸较大的III类MnS。随S含量的提高,大尺寸MnS数量增加,沿晶界偏聚分布的情况更为严重。

关键词(KeyWords)： 易切削非调质钢;Thermo-Calc;MnS;Scheil-Gulliver凝固模型;偏析

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51174020);; 中央高校基本科研业务费专项资金(FRF-SD-12-010A)

作者(Author): 李梦龙,王福明,陶素芬,李天生,孟庆勇

DOI: 10.13289/j.issn.1009-6264.2014.04.016

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