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Mechanisms of Solidification Structure Improvement of Ultra Pure 17 wt% Cr Ferritic Stainless Steel by Ti, Nb Addition

ISSN号：1005-0302
期刊名称：《材料科学技术学报：英文版》
时间：0
分类：TG142.33[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学] TG146.21[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
作者机构：[1]Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
相关基金：Acknowledgement The authors are thankful to the National Natural Sci- ence Foundation of China （No. 50734002） for the financial support of this work.

作者： Yating Shan Xinghong Luo Xiaoqiang Hu Shi Liu[1]

关键词：铌微合金化, 凝固结构, 不锈钢, 铁素体, 超纯水, 机制, 钛, 晶粒尺寸, Ultra pure ferritic stainless steel, Micro-alloying, Solidification structure, Titanium, Niobium

中文摘要：

在团结微观结构的谷物结构和 precipitates 极端纯有不同 Ti 或 Nb micro-alloying 的 17 wt% Cr 以铁酸盐为主要成的不锈钢试验性地并且理论上被调查。到钢的 Ti 或 Nb 的增加减少了谷物尺寸(D) 和延伸因素(E) ，这被谷物结构观察发现，并且改进了 equiaxed 谷物比例(P) 和球状因素() 。在学习的四钢之中，最小的谷物尺寸和最大的 equiaxed 谷物比例被联合把 Ti 和 Nb 加到钢获得。SEM 观察显示了那几种猛冲例如锡， MC (在 Nb 的富人) ，等等，洗阶段(Fe2Nb ) 在相应的钢形成了。另外，用 Thermo 计算软件计算的结果说明了那听在合适的 Ti 和 N 内容在液体猛抛。同时，团结间隔(T) 被 Ti 或 Nb 的增加扩大，并且 Nb 的有效性比 Ti 强壮。基于试验性并且计算结果，在 equiaxed 谷物比例的谷物精炼和增长的机制被讨论。

英文摘要：

The grain structures and the precipitates in the solidification microstructure of the ultra pure 17 wt% Cr ferritic stainless steels with different Ti and/or Nb micro-alloying were investigated both experimentally and theoretically. It was found by the grain structure observation that the addition of Ti or Nb to the steel reduced the grain size （D） and elongation factor （E）, and improved the equiaxed grain proportion （P） and globularity factor （￡）. Among the four steels studied, the minimum grain size and maximum equiaxed grain proportion were obtained by jointly adding both Ti and Nb to the steel. The SEM observation indicated that several kinds of precipitations, such as TiN, MC （rich in Nb）, Laves phase （Fe2Nb） and so on, formed in the corresponding steels. In addition, the results calculated using the Thermo-Calc software illustrated that TiN precipitates in the liquid at proper Ti and N contents. Meanwhile, the solidification interval （△T） was enlarged by the addition of Ti or Nb, and the effectiveness of Nb was stronger than Ti. Based on the experimental and calculation results, the mechanisms of grain refinement and increment in equiaxed grain proportion were discussed.

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