会议专题

Two-sublattice thermodynamic model on carbonitride precipitation in microalloyed steels bearing Nb-V-Ti

Based on the two sublattice model of the regular solution, one being metal atom sublattice and another being interstitial atom sublattice, a thermodynamic model for the precipitates of niobium carbonitride, vanadium carbonitride and titanium carbonitride was established to study the starting-temperature of precipitates and the austenite compositions at given temperature in a low carbon steel. The calculation results show that starting-temperature of the precipitation of niobium carbonitride,vanadium carbonitride and titanium carbonitride are 1100℃, 920℃ and 1340℃, respectively, the mole fraction of carbonitride precipitates is 8.65×10-4 in the 0.053C-0.0028N-1.28Mn-0.008S-0.031Al-0.046Nb-0.008Ti-0.029V-Fe steel. When the N content is from 0.0028% to 0.0056%, the starting-temperature of the precipitation of the titanium carbonitride changes from 1340℃ to 1430℃. And the C content is from 0.053% to 0.07%, the starting-temperature of the precipitation of the titanium carbonitride hardly changes, but the atomic fraction of niobium in the carbonitride obviously increases.

microalloyed steel carbonitride precipitation two sublattice model thermodynamics

XIANG Song LIU Guo-quan

School of Materials and Metallurgy, Guizhou University, Guiyang 550003, China;The Key Laboratory for School of Materials Science and Engineering, University of Science and Technology, Beijing, Beijing

国际会议

The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)

北京

英文

860-866

2011-05-31(万方平台首次上网日期,不代表论文的发表时间)