Thermodynamic Model for Carbonitride Precipitation in Low Carbon Steel with Nb-Ti-V and Verification
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摘要: 钢中碳氮析出物通过细晶强化和析出强化影响钢的组织和性能。在规则溶液亚点阵模型的基础上建立了（NbxTivV1-x-v）（CyN1-y）-AlN-MnS的析出热力学模型，计算了析出相的开始析出温度、平衡摩尔分数以及碳氮化物的析出演变过程，并且使用Thermo-Calc热力学软件及TEM、EDS验证了这种热力学模型的准确性。计算得出MnS和AlN的开始析出温度分别为1 200℃和675℃，最大摩尔分数分别为1.05×10-4和1.21×10-4。碳氮化物演变顺序（Nb0.29Ti0.68V0.03）（C0.01N0.99）、（NbxTivV1-x-v）（CyN1-y）和（Nb0.29Ti0.45V0.26）（C0.87N0.13）。对比发现热力学计算结果与Thermo-Calc计算结果、透射电镜观察结果有较好的一致性。
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关键词:
- 低碳钢 /
- 碳氮化物 /
- 热力学模型 /
- Thermo-Calc计算
Abstract: Carbonitride precipitates influence the microstructure and properties of steel by grain refinement and precipitation strengthening.Based on a two-sub lattice model（metal atom sub lattice and interstitial atom sub lattice） of regular solution,a thermodynamic model for the precipitates of carbonitride,aluminium nitride and manganese sulfide was established and then used to calculate the starting-temperature of precipitates,the equilibrium molar fraction and the evolution of precipitation.The precipitation pattern was verified by Thermo-Calc software,transmission electron microscope（TEM） and energy dispersive spectrometer（EDS）.The calculation results show that starting-temperature of precipitation of MnS and AlN are 1 200 ℃ and 675 ℃,their molar fraction are 1.05×10-4 and 1.21×10-4.The evolution order of precipitation particles is(Nb0.29Ti0.68V0.03)(C0.01N0.99),(NbxTivV1-x-v)(CyN1-y) and(Nb0.29Ti0.45V0.26)(C0.87N0.13).By comparison,the simulation results of the model are in good agreement with the calculation by the Thermo-Calc software and the TEM observation results.-
Key words:
- low carbon steel /
- carbonitride /
- thermodynamic model /
- thermo-calc calculation
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