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首页> 外文期刊>ISIJ international >Effect of Inclusion Size and Type on the Nucleation of Acicular Ferrite in High Strength Ship Plate Steel
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Effect of Inclusion Size and Type on the Nucleation of Acicular Ferrite in High Strength Ship Plate Steel

机译：夹杂物尺寸和类型对高强度船用钢板钢针状铁素体形核的影响

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摘要

The mechanisms of acicular ferrite formation on non-metallic inclusion have been studied in high strength ship plate steel. The effect of inclusion size and type on the formation of acicular ferrite was studied by metallographic microscope and SEM-EDS. The inclusion composition was analyzed by Raman spectra. Experimental results showed that all the inclusions were nearly spherical in shape. Inclusion size was mainly from 1 μ m to 4 μ m in high strength ship plate steel. With increase of the inclusion size, the acicular ferrite nucleating rate increased. The probability of inducing nucleation increased gradually with the inclusion size increasing. The inclusions had an appropriate size to become nucleation center for acicular ferrite. This optimal size was about 3 μ m. The inclusion was composed by Ti, Mn, S, Si, O, Al and Mg. The composition of Ti–O–Mn inclusion was Ti_(2)O_(3) and MnS, but no MnTiO_(3). The surface of inclusion as an inert surface played an important role in nucleating of acicular ferrite. The lower low mismatch was also the important factors to promote the nucleation of acicular ferrite. Based on the two mechanisms, it would make it easier for acicular ferrite to nucleate.
机译：研究了高强度船用钢板中针状铁素体在非金属夹杂物上形成的机理。用金相显微镜和SEM-EDS研究了夹杂物的大小和类型对针状铁素体形成的影响。通过拉曼光谱分析夹杂物组成。实验结果表明，所有夹杂物均接近球形。在高强度船用钢板中，夹杂物尺寸主要为1μm至4μm。随着夹杂物尺寸的增加，针状铁素体成核速率增加。随着包裹体尺寸的增加，诱导形核的可能性逐渐增加。夹杂物具有合适的尺寸以成为针状铁素体的形核中心。该最佳尺寸为约3μm。夹杂物由Ti，Mn，S，Si，O，Al和Mg组成。 Ti–O–Mn夹杂物的成分为Ti_（2）O_（3）和MnS，但没有MnTiO_（3）。夹杂物表面作为惰性表面在针状铁素体成核中起重要作用。较低的低失配也是促进针状铁素体成核的重要因素。基于这两种机制，将使针状铁素体更容易成核。

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