Thermodynamical analysis of TiN precipitation in 21Cr ultra pure ferrite stainless steel

Abstract

Abstract: Number density and size distribution of non-metallic inclusion have important influences on processability and service behaviors of steel. The numerical modeling of TiN precipitation condition in 21Cr ultra-pure ferrite stainless steel was solved based on the basic solidification theory. Thermodynamic and kinetic formation conditions and precipitation laws of TiN were investigated theoretically. The findings showed that TiN is precipitated free in molten steel. Ti and N elements solute segregation occurs on the solid/liquid interface in the processing of solidification, which promote TiN precipitation starting as f_s=0.15. The precipitate size of TiN is affected by Ti, N content, and cooling rate. TiN radius can be reduced by decreasing the initial content of Ti, N and increasing the solidification cooling rate, Ti, N element contents are more sensitive to the effect of TiN size, so the timing of the precipitation of TiN inclusions during solidification can be significantly delayed by reducing the initial content of N in molten steel. Therefore, the addition amount of Ti in molten steel can be adjusted to make the quantity and size of TiN more reasonable in manufacture.

Key words: ultra pure ferrite stainless steel, TiN precipitation, solid fraction, cooling rates, Ti-N solubility product

CLC Number:

TF764

SHENG Jie, WEI Jia-fu, MENG Ya-hui, LI Yu-feng, MA Guo-cai, LA Pei-qing. Thermodynamical analysis of TiN precipitation in 21Cr ultra pure ferrite stainless steel[J]. Journal of Lanzhou University of Technology, 2023, 49(5): 1-9.

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