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首页> 外文期刊>ISIJ international >Analysis of Carbon Partitioning at an Early Stage of Proeutectoid Ferrite Transformation in a Low Carbon Mn-Si Steel by High Accuracy FE-EPMA
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Analysis of Carbon Partitioning at an Early Stage of Proeutectoid Ferrite Transformation in a Low Carbon Mn-Si Steel by High Accuracy FE-EPMA

机译：低碳锰硅钢中共析铁素体相变早期碳分配的高精度FE-EPMA分析

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摘要

To understand the γ→α transformation and control the carbon contents among the phases involved is most important in the design of high-strength and high-ductility low carbon steels. Using a previously-developed field emission-electron probe microanalyzer (FE-EPMA) which is able to suppress hydrocarbon contamination to a very low level, the carbon concentrations at γ/α interfaces and within the austenite were analyzed in Fe-xC-2.0Si-yMn (x=0.15 or 0.20, y=1.5 or 2.0 in mass%) steels isothermally transformed at 750℃ and 800℃. The paraequilibrium (PE) model gives a good accounting of carbon enrichment in the 1.5 mass% Mn steel held for 15 s, whereas the NPLE/PLE transition model of local equilibrium gives a much better accounting in the 2.0 mass% Mn steel than PE. However, the interfacial carbon concentration agrees with the composition shown by the NPLE/PLE transition line in both alloys when annealed for 1 800 s. In the 1.5 mass% Mn steel, the carbon concentration at the interface in austenite seems to have shifted from PE to NPLE during annealing.
机译：在高强度高延展性低碳钢的设计中，了解γ→α的转变并控制所涉及相之间的碳含量是最重要的。使用以前开发的能够将碳氢化合物污染抑制到非常低水平的场发射电子探针显微分析仪（FE-EPMA），在Fe-xC-2.0Si中分析了γ/α界面和奥氏体内的碳浓度。 -yMn（x = 0.15或0.20，y = 1.5或2.0质量％）钢在750℃和800℃等温转变。准平衡（PE）模型很好地说明了保持15 s的1.5质量％Mn钢中的碳富集，而局部平衡的NPLE / PLE过渡模型给出了2.0质量％Mn钢中比PE更好的碳富集。但是，当退火1 800 s时，两种合金中的界面碳浓度均与NPLE / PLE过渡线所示的成分一致。在1.5质量％的Mn钢中，在退火过程中，奥氏体界面处的碳浓度似乎已经从PE转移到NPLE。

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  • 来源
    《ISIJ international》 |2018年第6期|1079-1085|共7页
  • 作者

    Takako YAMASHITA; Masato ENOMOTO; Yuji TANAKA; Hiroshi MATSUDA; Masayasu NAGOSHI;

  • 作者单位

    Steel Research Laboratory Analysis & Characterization Research Dept., JFE Steel Corp., 1, Kawasaki-cho, Chuo-ku, Chiba, 260-0835 Japan;

    Emeritus Professor of Ibaraki Univ., Bunkyo, Mito, 310-8512 Japan;

    Steel Research Laboratory Analysis & Characterization Research Dept., JFE Steel Corp., 1, Kawasaki-cho, Chuo-ku, Chiba, 260-0835 Japan;

    Steel Research Laboratory Analysis & Characterization Research Dept., JFE Steel Corp., 1, Kawasaki-cho, Chuo-ku, Chiba, 260-0835 Japan;

    JFE Techno-Research Corp., 1-1, Minamiwatarida-cho, Kawasaki-ku, Kawasaki, 210-0855 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phase transformation; local equilibrium; paraequilibrium; phase diagram; thermodynamics; high tensile steel; intercritical annealing;

    机译：相变局部均衡超平衡相图热力学高强度钢临界退火;

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