Thermodynamic model for precipitation of carbonitrides in microalloyed steels and its application in Ti-V-C-N system  

作　　者：Yan-Lin Wang Long-Chao Zhuo Ming-Wen Chen Zi-Dong Wang 

机构地区：[1]School of Materials Science and Engineering,Tsinghua University [2]School of Materials Science and Engineering,University of Science and Technology Beijing [3]School of Materials Science and Engineering,Xi'an University of Technology [4]School of Mathematical and Physical Sciences,University of Science and Technology Beijing

出　　处：《Rare Metals》2016年第10期735-741,共7页稀有金属（英文版）

基　　金：financially supported by the Science and Technology Support Project of Jiangxi Province(No. 20112BBE50006);Young Scientists of Jiangxi Province Training Objects(No.20133BCB23032)

摘　　要：Based on mass balance and solubility product equations, a thermodynamic model enabling the calcula- tion of equilibrium carbonitride composition and relative amounts as a function of steel composition and tem- perature was developed, which provides a method to es- timate the carbonitride complete dissolution temperature for different steel compositions. Actual carbonitride pre- cipitation behavior was further verified in Ti-V-C-N microalloyed steel system. The model suggests that for higher IV] and [Ti] dissolved in steels, it is available to decrease the addition of C and N during alloy composi- tion design. The resultant longer fatigue life of the modified steel could be attributed to the more [V] and [Ti] dissolved in the matrix, inducing finer dispersion of carbonitrides. Therefore, this model is proved to be effective in determining better chemical composition for high-performance steels, leading to possible reductions in the cost of production and improvements in the combined mechanical properties of the steels.Based on mass balance and solubility product equations, a thermodynamic model enabling the calcula- tion of equilibrium carbonitride composition and relative amounts as a function of steel composition and tem- perature was developed, which provides a method to es- timate the carbonitride complete dissolution temperature for different steel compositions. Actual carbonitride pre- cipitation behavior was further verified in Ti-V-C-N microalloyed steel system. The model suggests that for higher IV] and [Ti] dissolved in steels, it is available to decrease the addition of C and N during alloy composi- tion design. The resultant longer fatigue life of the modified steel could be attributed to the more [V] and [Ti] dissolved in the matrix, inducing finer dispersion of carbonitrides. Therefore, this model is proved to be effective in determining better chemical composition for high-performance steels, leading to possible reductions in the cost of production and improvements in the combined mechanical properties of the steels.

关 键 词：Microalloyed CARBONITRIDES Thermodynamic model DISSOLUTION 

分 类 号：TG142.1[一般工业技术—材料科学与工程]