Mg处理Nb-Ti微合金钢中非金属夹杂物演变机理研究

摘要/Abstract

摘要： 在工业生产条件下，对Nb-Ti微合金钢进行Mg处理试验，分析了Mg处理条件下，微合金钢中非金属夹杂物的演变规律。结果表明，微合金钢经过铝脱氧产物主要为Al₂O₃夹杂，进行Ca处理后，Al₂O₃夹杂减少，转变为CaO-Al₂O₃夹杂，且部分MnS夹杂转变为CaS夹杂；精炼阶段将Ca处理改为Mg处理后，可将铝脱氧产物Al₂O₃夹杂变性为MgO-Al₂O₃夹杂。Mg处理前，夹杂物在LF主要是Al₂O₃夹杂，进行Mg处理和Ti合金化后，钢中主要夹杂物变为MgO-Al₂O₃夹杂、MgO夹杂和TiN夹杂，最终在铸坯中的夹杂物为MgO-Al₂O₃外包裹CaS/MnS和(Nb、Ti)N复合夹杂。对Ca处理和Mg处理的夹杂物尺寸进行对比，夹杂物尺寸主要分布在5 μm以内，Mg处理形成的2 μm以内的夹杂物占比高于Ca处理工艺，表明镁处理可以较好地细化夹杂物，形成大量弥散分布的细小夹杂，有助于提升钢的综合力学性能。

关键词: Mg处理, Nb-Ti微合金钢, 非金属夹杂物, 热力学分析

Abstract: Under industrial conditions, the Mg treatment test of Nb-Ti micro-alloyed steel was carried out. The evolution of nonmetallic inclusions in micro-alloyed steel treated with Mg was analyzed. The results show that, Al₂O₃ inclusion is the main product of aluminum deoxidation in micro-alloyed steel. After Ca treatment, Al₂O₃ inclusions are reduced and transformed into CaO-Al₂O₃ inclusions, and part of MnS inclusions are transformed into CaS inclusions. After Ca treatment is changed to Mg treatment in the refining stage, Al₂O₃ inclusions of aluminum deoxidation product can be denatalized to MgO-Al₂O₃ inclusions. Before Mg treatment, the inclusions in LF are mainly Al₂O₃ inclusions. After Mg treatment and Ti alloying, the main inclusions in steel become MgO-Al₂O₃ inclusions, MgO inclusions and TiN inclusions. The final inclusions in the billet are MgO-Al₂O₃ coated with CaS/MnS and (Nb, Ti) N complex inclusions. The size of inclusions treated with Ca and Mg was compared, and the size of inclusions mainly distributed within 5 μm. The proportion of inclusions within 2 μm formed by Mg treatment is higher than that by Ca treatment, which indicates that magnesium treatment can fine inclusions better. The formation of a large number of dispersed small inclusions is helpful to improve the comprehensive mechanical properties of steel.

Key words: Mg treatment, Nb-Ti micro-alloyed steel, nonmetallic inclusion, thermodynamic analysis

朱吴杰, 王德永, 孙群, 温荣宇, 屈天鹏. Mg处理Nb-Ti微合金钢中非金属夹杂物演变机理研究[J]. 炼钢, 2024, 40(4): 40-51.

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Mg处理Nb-Ti微合金钢中非金属夹杂物演变机理研究

Mechanism investigation on inclusion evolution in Nb-Ti micro-alloyed steel with Mg treatment

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