东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (5): 641-645.DOI: 10.12068/j.issn.1005-3026.2015.05.008

• 材料与冶金 • 上一篇    下一篇

锆脱氧钢中非金属夹杂物及对显微组织的影响

王超, 王国栋   

  1. (东北大学 轧制技术及连轧自动化国家重点实验室, 辽宁 沈阳110819)
  • 收稿日期:2014-03-31 修回日期:2014-03-31 出版日期:2015-05-15 发布日期:2014-11-07
  • 通讯作者: 王超
  • 作者简介:王超(1986-),男,河北沧州人,东北大学博士研究生; 王国栋(1942-),男,辽宁大连人,东北大学教授,博士生导师,中国工程院院士.
  • 基金资助:
    “十二五”国家科技支撑计划项目(2012BAF04B01).

Non-metallic Inclusions and Its Effect on Microstructure of Zr Deoxidized Steel

WANG Chao, WANG Guo-dong   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2014-03-31 Revised:2014-03-31 Online:2015-05-15 Published:2014-11-07
  • Contact: WANG Chao
  • About author:-
  • Supported by:
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摘要: 实验用钢在低碳锰钢基础上采用锆脱氧及钛微合金化,研究了连续冷却和等温热处理条件下的组织转变行为,分析了夹杂物的析出类型及对组织转变的影响机理.统计结果表明:夹杂物在0.2~1μm尺寸范围内有较高的数量密度,主要为ZrO2·MnS和ZrO2·MnS·TiN复相夹杂,与热力学分析结果一致.实验钢以1℃/s连续冷却及500℃等温时均得到晶内针状铁素体组织,促进铁素体形核的主要夹杂物类型为ZrO2·MnS·TiN.MnS以ZrO2为核心复合析出形成贫锰区是促进铁素体形核的重要因素,TiN的复合析出降低了铁素体形核界面能,进一步促进了针状铁素体转变.

关键词: 锆脱氧钢, 非金属夹杂物, 针状铁素体, 贫锰区, ZrO2

Abstract: Transformation behaviors of a Zr deoxidized and Ti microalloyed low C-Mn steel under continuous cooling and isothermal treatment were studied. The precipitation of non-metallic inclusions and its influence on the microstructure were analyzed. Statistical results showed that the inclusions are mainly ZrO2·MnS and ZrO2·MnS·TiN composites, which are in accordance with thermodynamic analysis. The size of inclusions is in the range of 0.2~1μm and the number density of inclusions is high. Intragranular acicular ferrite is obtained under both conditions of continuous cooling with 1℃/s and isothermal treatment at 500℃. Inclusions, which can promote ferrite nucleation, are mostly ZrO2·MnS·TiN type. Formation of Mn-depletion zone with MnS precipitation on the ZrO2 core is an important factor in ferrite nucleation. Composite precipitation of TiN can reduce the interface energy of ferrite nucleation, which can further promote acicular ferrite transformation.

Key words: Zr deoxidized steel, non-metallic inclusion, acicular ferrite, Mn-depletion zone, ZrO2

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