45号钢中镁铝尖晶石夹杂物诱导晶内铁素体析出形成机理研究

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基金项目:

国家自然科学基金（51474089）；大学生创新创业计划（X2018071）。

Study on the Mechanism of Ferrite Precipitate Formation in the Crystallization of Magnesia-alumina Spinel Inclusion in Gr45 Steel

1. Institute of Materials, North China University of Science and Technology, Tangshan 063009, Hebei, China;
2. Institute of Yisheng, North China University of Science and Technology, Tangshan 063009, Hebei, China;
3. Institute of Information, North China University of Science and Technology, Tangshan 063009, Hebei, China

摘要: 以热力学基本原理和错配度理论为基础，计算分析45号钢内镁铝尖晶石的形成过程，在45号钢的液相线温度下，钢液中的氧活度一定的情况下，氧化铝会优于氧化镁生成，并且计算了铝元素一定的情况下，只要有微量的镁就可以生成镁铝尖晶石夹杂物。并通过二维错配度的计算证明了镁铝尖晶石和晶内铁素体的匹配关系良好，容易形成共格结构，为晶内铁素体的析出提供了良好的基底面。
- 45号钢 /
- 晶内铁素体 /
- 镁铝尖晶石 /
- 活度 /
- 生成吉布斯自由能 /
- 二维错配度
Abstract: Based on the basic principles of thermodynamics and the theory of mismatch degree, the formation process of MG-Al Spinel in Gr 45 steel is calculated and analyzed.When the temperature is below liquid line,given certain oxygen activityAlO form prior to MgO.At a given elemental content,Magnesia-alumina spinel inclusions can be produced as long as there is a trace of magnesium.It is proved that the matching relationship between Mg-Al Spinel and ferrite is good,and it is easy to form a common lattice structure,which provides a good substrate for the crystallization of ferrite.
- Gr 45 steel /
- crystalline ferrite /
- magnesia-alumina spinel /
- activity /
- formation of gibbs free energy /
- two-dimensional mismatch