Solidification structure refinement of ferritic stainless steel based on heterogeneous nucleation technology
Xiao-fang Shi1,2, Li-zhong Chang1,2, Li Zhou1,2
1 School of Metallurgy Engineering, Anhui University of Technology, Ma’anshan 243032, Anhui, China
2 Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, Anhui, China
Solidification structure refinement of ferritic stainless steel based on heterogeneous nucleation technology
Xiao-fang Shi1,2, Li-zhong Chang1,2, Li Zhou1,2
1 School of Metallurgy Engineering, Anhui University of Technology, Ma’anshan 243032, Anhui, China
2 Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, Anhui, China
摘要 The ridging defect on the surface of stainless steel products is related to the solidification structure of ferritic stainless steel. Refining the solidification structure and increasing the proportion of equiaxed grains are necessary to lessen the ridging defect. Therefore, a new idea of using a heterogeneous nucleating agent which was composed of the composite core containing Ti was proposed, that is, a large amount of dispersed fine particles were initially formed on the solidification front, and a great amount of δ iron was then nucleated using these fine particles as the heterogeneous cores. Through analyzing the crystallographic relationship between different crystals and inducing the calculation formulas of disregistry, the disregistry between the different oxides and TiN and δ iron was explored and the type of nucleation core was determined. The key parameters of forming the composite core containing Ti were obtained through a thermodynamic calculation. The experimental results further confirm the correctness of the theoretical analysis.
Abstract:The ridging defect on the surface of stainless steel products is related to the solidification structure of ferritic stainless steel. Refining the solidification structure and increasing the proportion of equiaxed grains are necessary to lessen the ridging defect. Therefore, a new idea of using a heterogeneous nucleating agent which was composed of the composite core containing Ti was proposed, that is, a large amount of dispersed fine particles were initially formed on the solidification front, and a great amount of δ iron was then nucleated using these fine particles as the heterogeneous cores. Through analyzing the crystallographic relationship between different crystals and inducing the calculation formulas of disregistry, the disregistry between the different oxides and TiN and δ iron was explored and the type of nucleation core was determined. The key parameters of forming the composite core containing Ti were obtained through a thermodynamic calculation. The experimental results further confirm the correctness of the theoretical analysis.
Xiao-fang Shi,Li-zhong Chang,Li Zhou. Solidification structure refinement of ferritic stainless steel based on heterogeneous nucleation technology[J]. Journal of Iron and Steel Research International, 2019, 26(2): 137-147.
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