MODELING OF STRAIN-INDUCED PRECIPITATION KINETICS IN Nb MICROALLOYED STEELS
来源期刊：Acta Metallurgica Sinica2006年第5期
论文作者：D. Wu C.M. Li X.G. Zhou Z.Li Z.Y. Liu
Key words：strain-induced precipitation; start time of precipitation; end time of precipitation; precipitation kinetics;
Abstract: On the basis of the thermodynamic calculation of precipitation and considering the effect of strain on the precipitation behavior and chemical composition (Si and Mn), the kinetics of precipitation from austenite has been investigated for different temperatures and strains. Nucleation theory and the solubility product of niobium, carbon, and nitrogen in austenite have been used to derive equations for the start time of precipitation as a function of temperature and composition. The value of n in Avrami equation was determined using the available experimental data from the published reports, which indicated that n is a constant independent of temperature and the end time of precipitation is a function of n and the start time of precipitation. The values of the start time and end time of precipitation predicted by the new model are compared with the experimental values and a good agreement was obtained between both.
D. Wu1，C.M. Li2，X.G. Zhou1，Z.Li3，Z.Y. Liu1
(1.State Key Lab. of Rolling and Automation, Northeastern University, Shenyang 110004, China;
2.Engineering & Research Incorporation Limited, WISDRI (Wuhan Iron & Steel Design and Research General Incorporation;
3.Baoshan Iron & Steel Co. Ltd., Shanghai 201900, China)
Abstract:On the basis of the thermodynamic calculation of precipitation and considering the effect of strain on the precipitation behavior and chemical composition (Si and Mn), the kinetics of precipitation from austenite has been investigated for different temperatures and strains. Nucleation theory and the solubility product of niobium, carbon, and nitrogen in austenite have been used to derive equations for the start time of precipitation as a function of temperature and composition. The value of n in Avrami equation was determined using the available experimental data from the published reports, which indicated that n is a constant independent of temperature and the end time of precipitation is a function of n and the start time of precipitation. The values of the start time and end time of precipitation predicted by the new model are compared with the experimental values and a good agreement was obtained between both.
Key words:strain-induced precipitation; start time of precipitation; end time of precipitation; precipitation kinetics;
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