镁处理高碳硬线钢中夹杂物

doi:10.13228/j.boyuan.issn0449-749x.20210069

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摘要为了研究镁处理对高碳硬线钢中夹杂物影响规律,采用扫描电镜-能谱仪、FactSage热力学软件研究了不同镁添加量下钢中夹杂物的成分、形貌、尺寸、数量和分布,计算了高碳硬线钢中夹杂物平衡成分和生成质量随镁添加量的变化,分析了镁处理对夹杂物熟化生长的影响规律。结果表明,高碳硬线钢中镁质量分数由0.001 0%增加到0.001 8%,夹杂物的转变路线为Al₂O₃→Spinel→MgO,夹杂物平均尺寸由1.68 降到1.39 μm,且夹杂物分布更加均匀。随着溶解氧含量的增加,夹杂物的粗化率增加。当钢中溶解氧含量相同时,镁铝尖晶石的粗化率最大,其次是氧化镁,氧化铝夹杂物的粗化率最小。高碳硬线钢中镁添加量为0～0.004%,夹杂物的粗化率先增加后减小,镁添加量为0.001%时,夹杂物的粗化率最大。

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	王林珠
	席作冰
	李长荣

关键词 ：镁处理, 夹杂物, 熟化生长, 粗化率, 尺寸, 分布

Abstract：In order to study the influence of magnesium treatment on inclusions in high carbon hard wire steel, the composition, morphology, size, number and distribution of inclusions in steel with different amounts of magnesium were studied by SEM-EDS and FactSage thermodynamic software. The change of equilibrium composition and formation quality of inclusions in high carbon hard wire steel with magnesium addition was calculated, and the influence of magnesium treatment on the aging growth of inclusions was analyzed. The results show that the magnesium content in high carbon hard wire steel increased from 0.001 0% to 0.001 8%, the average size of inclusions decreased from 1.68 to 1.39 μm, and the distribution of inclusions was more uniform. With the increase of magnesium addition, the transformation route of inclusions in high carbon hard wire steel was Al₂O₃→Spinel→MgO. With the increase of dissolved oxygen content, the coarsening rate of inclusions such as alumina, magnesia-alumina spinel and magnesia increased. When the content of dissolved oxygen in steel was the same, the coarsening rate of magnesia-alumina spinel was the largest, and then the coarsening rate of magnesia and alumina inclusions was the smallest. With the increase of magnesium content from 0 to 0.004% in high carbon hard wire steel, the coarsening rate of inclusions increases first and then decreases. When the addition amount of magnesium was 0.001%, the coarsening rate of inclusions was the highest.

Key words： magnesium treatment inclusion ostwald ripening coarsening rate size distribution

收稿日期: 2021-02-02

引用本文:

王林珠, 席作冰, 李长荣. 镁处理高碳硬线钢中夹杂物[J]. 钢铁, 2021, 56(7): 56-62. WANG Lin-zhu, XI Zuo-bing, LI Chang-rong. Inclusions in high-carbon hard wire steel treated by Mg[J]. Iron and Steel, 2021, 56(7): 56-62.

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http://www.chinamet.cn/Jweb_gt/CN/10.13228/j.boyuan.issn0449-749x.20210069 或 http://www.chinamet.cn/Jweb_gt/CN/Y2021/V56/I7/56

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