| 含钛齿轮钢中CaO-Al2O3-TiOx+TiN系夹杂物形成机理 |
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| 引用本文： | 郝广御,袁康,高静,邓志银,朱苗勇.含钛齿轮钢中CaO-Al2O3-TiOx+TiN系夹杂物形成机理[J].钢铁,2020,55(10):37-42. |
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| 作者姓名： | 郝广御 袁康 高静 邓志银 朱苗勇 |
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| 作者单位： | 1.东北大学多金属共生矿生态化冶金教育部重点实验室, 辽宁 沈阳 110819;
2.东北大学冶金学院, 辽宁 沈阳 110819 |
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| 基金项目： | 中国博士后基金资助项目(2019M651131); 中央高校基本科研业务费资助项目(N182504016); 国家级大学生创新训练计划资助项目(201910145069) |
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| 摘 要： | 为了研究20CrMnTi齿轮钢中特殊夹杂物(CaO-Al2O3-TiOx包裹TiN的复合夹杂物)的形成机理,结合工业试验和实验室合金化试验,借助热力学计算推断了TiN直接生成的可能性。研究发现,钛铁合金的洁净度较差,合金中含有较多的Al2O3和TiN夹杂物。在炼钢温度条件下,钢中的溶解钛与氮反应生成TiN在热力学上是不可能的。复合夹杂物的TiN核不可能是由钢中的溶解钛和氮直接反应生成,而应该是由合金带入的。当CaO-Al2O3-TiOx系夹杂物与未溶解完全的TiN碰撞到一起后,液态的夹杂物将TiN包裹,从而形成较大尺寸的CaO-Al2O3-TiOx包裹TiN的夹杂物。要控制这类夹杂物,需采用氮质量分数更低的钛铁合金。
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| 关 键 词： | 含钛齿轮钢 夹杂物 氮化钛 形成机理 钛铁合金 |
| 收稿时间： | 2020-02-18 |
Formation mechanism of CaO-Al2O3-TiOx+TiN system inclusions in Ti-bearing gear steel |
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| HAO Guang-yu,YUAN Kang,GAO Jing,DENG Zhi-yin,ZHU Miao-yong.Formation mechanism of CaO-Al2O3-TiOx+TiN system inclusions in Ti-bearing gear steel[J].Iron & Steel,2020,55(10):37-42. |
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| Authors: | HAO Guang-yu YUAN Kang GAO Jing DENG Zhi-yin ZHU Miao-yong |
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| Affiliation: | 1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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| Abstract: | Industrial and laboratory experiments were carried out to investigate the formation mechanism of a special kind of complex inclusions (TiN surrounded by CaO-Al2O3-TiOx) in 20CrMnTi gear steel, and thermodynamic calculations were also conducted to check the possibility of the formation of TiN by the dissolved elements in the liquid steel. It is found that Ti-Fe alloy has poor cleanliness and contains many Al2O3 and TiN inclusions. At the steelmaking temperature, the reaction of dissolved Ti and N in steel to form TiN is thermodynamically impossible. The TiN core of the complex inclusions cannot be generated by the direct reaction between dissolved Ti and N in the steel but should be sourced from the Ti-Fe alloy. When the liquid CaO-Al2O3-TiOx inclusions collide with the undissolved TiN, TiN inclusions would be wrapped by the liquid inclusions, thus forming larger CaO-Al2O3-TiOx inclusions with a TiN core inside. Ti-Fe alloys with lower nitrogen content are suggested to control these inclusions. |
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| Keywords: | Ti-bearing gear steel inclusion TiN formation mechanism Ti-Fe alloy |
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