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首页> 外文期刊>Steel Research International >Study on the Formation of Intragranular Acicular Ferrite in a Zr-Mg-Al Deoxidized Low Carbon Steel
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Study on the Formation of Intragranular Acicular Ferrite in a Zr-Mg-Al Deoxidized Low Carbon Steel

机译：Zr-Mg-Al脱氧低碳钢中晶内针状铁素体形成的研究

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摘要

The formation of intragranular acicular ferrite (IAF) in a Zr-Mg-Al deoxidized low carbon steel was investigated by means of dilatometry, thermo-mechanical controlled processing, and combined these results with metallographical observations. The typical inclusions were characterized by scanning electron microscopy and the chemical composition of the inclusions was determined by energy dispersive spectroscopy. The role of these inclusions on the formation of IAF was discussed. The results indicate that the Al2O3-MgO-ZrO2 and Al2O3-MgO-ZrO2-MnS multiphase particles with 1.5-3.0m size can be the effective nuclei of IAF, whereas the Al2O3-MnS inclusions are inert. A Mn-depletion zone is observed adjacent to the Al2O3-MgO-ZrO2-MnS inclusion, which is believed to be one of the possible mechanisms to promote the IAF formation. Through dilatometric tests, for Zr-Mg steel, the IAF structure forms in the cooling rate range of 1-10 degrees Cs-1, and the most appropriate cooling rate for IAF is in the range of 5-10 degrees Cs-1. A fine grained microstructure and an improvement of toughness and tensile properties are obtained after subjecting the steel grade with Zr and Mg additions to a special thermo-mechanical regime.
机译：Zr-Mg-Al脱氧低碳钢中晶内针状铁素体（IAF）的形成是通过膨胀法，热机械控制工艺研究的，并将这些结果与金相观察相结合。通过扫描电子显微镜对典型的夹杂物进行表征，并通过能量色散光谱法确定夹杂物的化学组成。讨论了这些夹杂物在IAF形成中的作用。结果表明，尺寸为1.5-3.0m的Al2O3-MgO-ZrO2和Al2O3-MgO-ZrO2-MnS多相颗粒可以作为IAF的有效核，而Al2O3-MnS夹杂物是惰性的。观察到与Al2O3-MgO-ZrO2-MnS夹杂物相邻的Mn耗尽区，这被认为是促进IAF形成的可能机制之一。通过膨胀试验，对于Zr-Mg钢，IAF的组织形成的冷却速率为1-10℃Cs-1，最合适的IAF冷却速率为5-10℃Cs-1。在对添加Zr和Mg的钢种进行特殊的热机械作用后，可以获得细晶粒的组织，并提高了韧性和拉伸性能。

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