高钢级管线钢中碳氮化物析出对提高钢的强韧性有着非常重要的作用.基于高钢级管线钢的成分体系,建立（Nbx,Ti1-x）（CyN1-y）-AlN复合析出的双亚点阵热力学模型,计算出800～1 450℃内两种不同Nb含量的管线钢中碳氮化物复合析出数据,并与Jmatpro软件计算结果进行比较.结果表明：Nb含量的增加,提高了Nb的全固溶温度,扩大了高温析出温度区域;Ti元素在1 200～1 450℃内析出速度很快,1 200℃时两种成分钢中Ti的析出量均大于50%;800℃平衡态时,析出物均以NbC为主;Nb对Ti元素的交互作用间接影响到AlN的析出;热力学计算结果与JMatpro软件计算结果进行比较,试验数据有着良好的一致性.
Carbonitride precipitates have significant effects on the strength and toughness of high-grade pipeline steels.Based on the composition of high-grade pipeline steels,an ideal two-sub-lattice model which was a thermodynamic model for(Nbx,Ti1-x)(CyN1-y)-AlN complex precipitate was established to calculate carbonitride precipitation with different content of Nb between 800 ℃ and 1 450 ℃.The results show that,with the content of Nb increased,the dissolution temperature is increased,and the precipitation temperature range is expanded;Ti elements precipitated fast at the range from 1 200 ℃ to 1 450 ℃.When the temperature was 800 ℃,the NbC precipitates were dominated in equilibrium.Nb affected the precipitation of AlN indirectly.Thermodynamic calculation results are in agreement with those of JMatpro software.
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