基于双亚点阵模型对H13钢中初生碳氮化物的研究

发布时间：2018-03-02 15:30

本文选题：热作模具钢　切入点：初生碳氮化物　出处：《工程科学学报》2017年01期 　论文类型：期刊论文

【摘要】：实验证明H13钢中存在三类初生碳氮化物,包括富V和C的(V_x,Mo_(1-x))(C_y,N_(1-y))、富Ti和N的(Ti_x,V_(1-x))(C_y,N_(1-y))及富V和C的(Ti_x,V_(1-x))(C_y,N_(1-y)),部分存在形核核心.基于双亚点阵模型和凝固偏析模型分析计算H13钢凝固过程中元素含量变化,考虑初生碳氮化物中元素间的相互作用,根据三类碳氮化物中合金元素含量和C/N比值不同,对各碳氮化物的生成自由能进行分析.理论研究指出富Ti和N的(Ti_x,V_(1-x))(C_y,N_(1-y))在固相率为0.90时即可生成,而富V和C的(Ti_x,V_(1-x))(C_y,N_(1-y))在固相率大于0.96才可生成,两类碳氮化物的临界生成固相率fP均随固溶Ti和N含量的增加而减小.(V_x,Mo_(1-x))(C_y,N_(1-y))的临界生成固相率与x值密切相关,x减小时fP降低,粒子尺寸增加,实验与理论分析吻合良好.根据错配度分析氧化物和碳氮化物对H13钢中初生碳氮化物异质形核的作用.
[Abstract]:The experimental results show that there are three kinds of primary carbonitride in H13 steel. Including the V / V / C / V / S / V / S / V / C / V / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / V / C / C / C / C / C / C / C / C / C / V / C / C / V / C / C / V / C / C / C / C / V / C / C / V / C / C / V / C / C / V / S / V / C / C / C / C / V / C / C / C / V / C / C / C / C / C / C / C / V / C. Considering the interaction between elements in primary carbonitride, according to the content of alloy elements and the ratio of C / N in three kinds of carbonitride, The free energy of formation of each carbon nitride is analyzed. The theoretical study indicates that the TixV / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / T / C / T / T / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C / C /. The critical solid state fraction (FP) of the two carbonitride compounds decreases with the increase of Ti and N contents. The critical solid state rate of the two kinds of carbonitride compounds decreases with the increase of Ti and N contents. The critical solid state rate of the two kinds of carbonitride compounds is closely related to the value of x, and the particle size increases, and the critical solid rate decreases with the increase of Ti and N contents. According to the mismatch, the effect of oxide and carbonitride on the heterogenetic nucleation of primary carbon nitride in H13 steel was analyzed.
【作者单位】：北京科技大学冶金与生态工程学院;钢铁研究总院高温材料研究所;
【分类号】：TG142.1

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