稀土对于H13钢中大尺寸非均质形核碳化物的影响

发布时间：2018-04-12 00:33

本文选题：H钢 + 碳化物　；参考：《中国稀土学报》2017年06期

【摘要】：通过加入不同的稀土含量对于H13钢中大尺寸碳化物的形核核心进行改质,研究了稀土对于形核核心的改质机理以及不同稀土含量对于形核核心的改质情况,并利用Factsage软件对于改质机理及完全改质形核核心的合理稀土加入量进行了理论计算。结果表明:稀土对于H13钢中大尺寸碳化物的形核核心具有良好的改质效果,随着稀土含量的增加,碳化物的形核核心的改质顺序为MgO·Al_2O_3—CeAlO_3—Ce_2O_2S或Ce_2O_3。错配度理论计算和实验表明MgO·Al_2O_3和CeAlO_3都能作为H13钢中大尺寸碳化物的形核核心,Ce_2O_2S和Ce_2O_3有效地抑制了大尺寸碳化物的非均质形核。合适的稀土加入量,MgO·Al_2O_3会被完全改质为稀土氧化物或稀土硫氧化物,达到减少H13钢中大尺寸碳化物数量的效果。热力学计算表明钢中氧含量越低,完全改质所需的稀土含量越少。
[Abstract]:By adding different rare earth contents to the nucleation core of large size carbide in H13 steel, the modification mechanism of rare earth to nucleation core and the modification of different rare earth content to nucleation core were studied.Factsage software was used to calculate the mechanism of modification and the reasonable amount of rare earth in the core of core modification.The results show that rare earth has a good effect on the nucleation of large-sized carbides in H13 steel. With the increase of rare earth content, the nucleation and tempering order of carbides is MgO Al_2O_3-CeAlO_3-Ce_2O_2S or ce _ 2O _ 3.The theoretical calculation and experiments of mismatch show that both MgO Al_2O_3 and CeAlO_3 can be used as nucleation cores of large size carbides in H13 steel. Ce _ 2O _ 2S and Ce_2O_3 can effectively suppress heterogeneous nucleation of large-sized carbides.The suitable amount of rare earth Al_2O_3 will be completely modified to rare earth oxide or rare earth sulfur oxide, which can reduce the amount of large size carbides in H13 steel.The thermodynamic calculation shows that the lower the oxygen content in the steel, the less the rare earth content needed for the complete modification.
【作者单位】：北京科技大学钢铁冶金新技术国家重点实验室;西宁特钢股份有限公司;
【基金】：国家自然科学基金项目(51674024)资助
【分类号】：TG142.1

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