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不锈钢中夹杂物三维形貌及其热力学计算

张一民 孙彦辉 白雪峰 卓超

张一民, 孙彦辉, 白雪峰, 卓超. 不锈钢中夹杂物三维形貌及其热力学计算[J]. 工程科学学报, 2020, 42(S): 14-20. doi: 10.13374/j.issn2095-9389.2020.03.25.s13
引用本文: 张一民, 孙彦辉, 白雪峰, 卓超. 不锈钢中夹杂物三维形貌及其热力学计算[J]. 工程科学学报, 2020, 42(S): 14-20. doi: 10.13374/j.issn2095-9389.2020.03.25.s13
ZHANG Yi-min, SUN Yan-hui, BAI Xue-feng, ZHUO Chao. Three-dimensional morphology and thermodynamic calculation of inclusions in stainless steel[J]. Chinese Journal of Engineering, 2020, 42(S): 14-20. doi: 10.13374/j.issn2095-9389.2020.03.25.s13
Citation: ZHANG Yi-min, SUN Yan-hui, BAI Xue-feng, ZHUO Chao. Three-dimensional morphology and thermodynamic calculation of inclusions in stainless steel[J]. Chinese Journal of Engineering, 2020, 42(S): 14-20. doi: 10.13374/j.issn2095-9389.2020.03.25.s13

不锈钢中夹杂物三维形貌及其热力学计算

doi: 10.13374/j.issn2095-9389.2020.03.25.s13
基金项目: 国家自然科学基金资助项目(51574026)
详细信息
    通讯作者:

    E-mail:ustb420@126.com

  • 中图分类号: TG115

Three-dimensional morphology and thermodynamic calculation of inclusions in stainless steel

More Information
  • 摘要: 采用无水电解法提取不锈钢中存在的典型夹杂物,通过扫描电子显微镜观察夹杂物三维形貌,并根据元素组成对夹杂物进行分类和形貌分析,对具有相同化学成分但不同三维形貌的夹杂物进行了表征和归纳。利用FactSage 7.0热力学软件,对不同夹杂物的平衡状态进行了计算,研究了温度和钢液成分对于夹杂物平衡的影响,并得到相应的平衡相图。结果表明,无水电解可以有效地将不锈钢中夹杂物完整地提取出来,避免了金相法带来的误差,可以更加清晰的观测夹杂物的三维形貌;经扫描电子显微镜观察和测量,较大的氧化铝夹杂物表面较为容易出现钛元素的富集区域,且大部分夹杂物形貌主要为球状和表面较为光滑的多面体状,直径一般不大于5 μm。通过热力学计算得到,钢中夹杂物的生成与钢中元素质量分数密切相关,在1873 K时,Mg、Ti、Si元素质量分数的不同会导致生成不同的夹杂物。
  • 图  1  不锈钢中氧化铝夹杂三维形貌

    Figure  1.  Three-dimensional morphology of the alumina inclusions in stainless steels

    图  2  不锈钢中氮化钛夹杂三维形貌

    Figure  2.  Three-dimensional morphology of the titanium nitride inclusions in stainless steels

    图  3  不锈钢中钛铝夹杂三维形貌

    Figure  3.  Three-dimensional morphology of the titanium and aluminum inclusions in stainless steels

    图  4  不锈钢中钛铝夹杂(氮化钛+氧化铝)三维形貌高倍图

    Figure  4.  Three-dimensional morphology of the titanium and aluminum inclusions (titanium nitride + alumina) in stainless steels at high magnification

    图  5  不锈钢中硅铝夹杂三维形貌

    Figure  5.  Three-dimensional morphology of the silicon-aluminum inclusions in stainless steels

    图  6  不锈钢中钙铝夹杂三维形貌

    Figure  6.  Three-dimensional morphology of the calcium and aluminum inclusions in stainless steels

    图  7  1873 K钢中Al‒O热力学平衡曲线

    Figure  7.  Thermodynamic equilibrium curves of Al‒O in steels at 1873 K

    图  8  1873 K钢中Al‒Ti热力学平衡曲线

    Figure  8.  Thermodynamic equilibrium curves of Al‒Ti in steels at 1873 K

    图  9  不同温度下钢中Ti‒N热力学平衡曲线

    Figure  9.  Thermodynamic equilibrium curves of Ti‒N in steels at different temperatures

    图  10  1873 K下钢中Al‒Si热力学平衡曲线

    Figure  10.  Thermodynamic equilibrium curves of Al‒Si in steels at 1873 K

    图  11  1873 K下钢中Al−Mg热力学平衡曲线

    Figure  11.  Thermodynamic equilibrium curves of Al−Mg in steel at 1873 K

    表  1  AISI321不锈钢化学成分(质量分数)

    Table  1.   Chemical composition of AISI321 stainless steels %

    CSiMnPSCrNiTiAlN
    0.030.371.130.0390.00219.148.760.3070.0260.02
    下载: 导出CSV
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  • 收稿日期:  2020-03-25
  • 刊出日期:  2020-12-25

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