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

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 di...

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Bibliographic Details
Published inRare metals Vol. 35; no. 10; pp. 735 - 741
Main Authors Wang, Yan-Lin, Zhuo, Long-Chao, Chen, Ming-Wen, Wang, Zi-Dong
Format Journal Article
LanguageEnglish
Published Beijing Nonferrous Metals Society of China 01.10.2016
Springer Nature B.V
Subjects
Biomaterials
Carbon nitride
Carbonitrides
Chemical composition
Chemistry and Materials Science
Composition effects
Dissolution
Energy
Engineering
Equilibrium
Fatigue life
High strength low alloy steels
Mass balance
Materials Engineering
Materials Science
Mathematical models
Mechanical properties
Metal fatigue
Metallic Materials
Microalloying
Nanoscale Science and Technology
Physical Chemistry
Reduction
Steel
Steels
Temperature
Thermodynamic models
Thermodynamics
Titanium
Vanadium
化学组合物
微合金钢
析出
溶解温度
热力学模型
碳氮化物
系统
质量平衡
Microalloyed
Thermodynamic model
Dissolution
Carbonitrides
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Summary: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.
Bibliography:Microalloyed; Carbonitrides;Thermodynamic model; Dissolution
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.
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ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-015-0495-4