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Effect of Surface Oxidation on Decarburization of a Fe-3%Si Steel during Annealing

机译：表面氧化对Fe-3％Si钢退火过程中脱碳的影响

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摘要

The main purpose of decarburization annealing is to reduce the mass fraction of carbon in Fe-3%Si steels to avoid magnetic aging in silicon steels. Decarburization annealing experiments are carried out at different annealing temperatures, P_(h2o)/P_(h2) and times. The morphological evolution of oxidized layer on steel surface, the changes of carbon and oxygen concentrations in a Fe-3% Si steel, and the influence of the oxidation of alloying elements on the decarburization are analyzed. Results show that decarburization rate of the tested silicon steel is the highest when annealing temperature is 1 103 K and P_(h2o)/P_(h2) is 0.374. When P_(h2o)/P_(h2) and annealing temperature are lower than that of optimum annealing condition, increasing annealing temperature or P_(h2o)/P_(h2_ result in the increase of the convective mass transfer coefficient between steel and atmosphere, promoting the mass transfer and intensifying decarburization reaction. On the other hand, the amount of oxide particles also increases with further increasing P_(h2o)/P_(h2) and annealing temperature, resulting in the hindrance of the diffusion of carbon atoms in the oxidized layer and slowdown of decarburization.
机译：脱碳退火的主要目的是减少Fe-3％Si钢中碳的质量分数，以避免硅钢中的磁时效。在不同的退火温度P_（h2o）/ P_（h2）和时间下进行脱碳退火实验。分析了钢表面氧化层的形貌演变，Fe-3％Si钢中碳和氧浓度的变化以及合金元素的氧化对脱碳的影响。结果表明，当退火温度为1 103 K，P_（h2o）/ P_（h2）为0.374时，硅钢的脱碳率最高。当P_（h2o）/ P_（h2）和退火温度低于最佳退火条件时，增加退火温度或P_（h2o）/ P_（h2_）会导致钢与大气之间的对流传质系数增加，从而促进另一方面，随着P_（h2o）/ P_（h2）和退火温度的进一步升高，氧化物颗粒的数量也增加，从而阻碍了碳原子在氧化层中的扩散。和脱碳的速度减慢。

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  • 来源
    《ISIJ international》 |2018年第9期|1727-1734|共8页
  • 作者

    Yue GUO; Fangqin DAI; Shoutian HU; Guang XU;

  • 作者单位

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 947 Heping Avenue, Qingshan District, Wuhan, Hubei, 430081 P.R. China;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 947 Heping Avenue, Qingshan District, Wuhan, Hubei, 430081 P.R. China;

    National Engineering Research Center For Silicon Steel, 28 Yejin Road, Qingshan District, Wuhan, Hubei, 430080 P.R. China;

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 947 Heping Avenue, Qingshan District, Wuhan, Hubei, 430081 P.R. China;

  • 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

    decarburization annealing; oxidized layer; annealing atmosphere; reaction temperature;

    机译：脱碳退火氧化层退火气氛反应温度;

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