Study on Improving Equiaxed Grain Ration of Ferritic Stainless Steel with Core Containing-Ti
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摘要: 阐明了铁素体不锈钢制品表面“皱折”缺陷产生的原因及对策,分析了目前改善铸坯凝固质量的各种方法的优缺点。基于前期的理论及试验结果,提出了采用含钛复合核心细化铁素体不锈钢凝固组织的思路,并进行了工业试验。试验结果表明,不加Ti板坯的等轴晶比例大约为30%,而添加了0.15% Ti的板坯等轴晶比例高达85%以上。对板坯中的含Ti核心类型进行统计,不同区域对应的核心类型不同,其中柱状晶区近50%的含Ti核心为Mg-Al-Ti (O,C),柱状晶向等轴晶过渡区Ti (C,N)、Ti N、Mg-Al-Ti (O,N)核心的数量相当,并且这些核心的外层均为Ti N,等轴晶区主要为Ti N核心,进一步证明了含钛核心是铁素体不锈钢凝固组织得以细化的主要原因。Abstract: The reason and countermeasure of "ridging"defect on the surface of stainless steel products is clarified,the advantages and disadvantages of various methods to improve the solidification quality of the casting billet are analyzed. Based on the previous theoretical and experimental results,the idea of refining the solidification structure of ferritic stainless steel with the composite core containing titanium is proposed and an industrial experiment is carried out.The result shows that the proportion of equiaxed grains without Ti addition is about 30%,while the proportion of equiaxed grains with 0. 15% Ti addition is above 85%.Through counting the cores containing-Ti in the different regions of the cast billet,it can be found that 50%of the cores in the columnar grain zone is Mg-Al-Ti( O,C),the cores in the CET zone are mainly composed of Ti( C,N),Ti N and Mg-Al-Ti( O,N) where the outer layer of the cores is Ti N,the cores in the equiaxed grain zone are mainly composed of Ti N.The results of the industrial test further prove that the core containing-Ti is the main reason for the refinement of solidification structure of the ferrite stainless steel.
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Key words:
- ferritic stainless steel /
- solidification /
- equiaxed grain /
- core-containing Ti
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