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对于铸钢、无相变的高合金铁素体或奥氏体钢,通过细化凝固组织改善综合性能异常重要。铸态轻合金的晶粒细化受溶质作用影响明显,但对于铁基合金来说,细化剂的溶质作用还有待深入研究。本文针对溶质为几种典型稀有金属的铁基二元合金,采用在铸态轻合金中成功应用的描述溶质作用的生长抑制因子理论模型,利用FactSage软件系统的Phase Diagram模块计算Fe-X系二元合金相图,进而计算不同溶质元素的Q值,探讨Fe基二元合金中几种典型稀有金属溶质原子对凝固组织细化的作用。结果表明,溶质为Ti、Zr、V、Nb、La、Ce的Fe-X二元合金系中,Q值由大到小的顺序依次为:Ti、Zr、Ce、La、Nb、V,理论上意味着在凝固组织细化中溶质作用由强到弱也呈这一顺序。研究结果能够为深入搞清通过变质剂细化钢的凝固组织的作用机理提供新的思路和一定的理论依据。
For cast steel, high-alloy, non-phase-change ferritic or austenitic steel, it is important to improve the overall performance by refining the solidified structure. The grain refinement of as-cast light alloy is significantly affected by solute effect, but the solute effect of the refiner remains to be further studied for iron-based alloys. In this paper, aiming at the iron-based binary alloys with several typical rare metals in solute, the theoretical model of growth inhibition factor, which describes the solute effect successfully used in as-cast light alloys, is adopted. Phase diagram module of FactSage software system is used to calculate Fe- Elemental phase diagram, and then calculate the Q value of different solute elements to explore the Fe-based binary alloys of several typical rare metal solute atoms on the solidification microstructure refinement. The results show that the order of Q value from high to low is as follows: Ti, Zr, Ce, La, Nb, V in the Fe-X binary alloys with Ti, Zr, V, Nb, La and Ce as solute Means that the solute in the refinement of the solidified structure is also in this order from strong to weak. The results can provide new ideas and theoretical basis for further understanding of the mechanism of the solidified microstructure of steel through the modification of modifier.