Nb微合金钢中碳化物高温溶解行为研究  

RESEARCH ON HIGH TEMPERATURE DISSOLUTION BEHAVIOR OF CARBIDE IN Nb MICRO ALLOYED STEEL

作　　者：陈剑[1] 李余飞[1] 赵永桥[1] 刘昭[1] 熊辉辉[1] 张恒华[1] 

机构地区：[1]省部共建高品质特殊钢冶金与制备国家重点试验室上海市钢铁冶金新技术开发应用重点实验室和上海大学材料科学与工程学院,上海200072

出　　处：《上海金属》2016年第4期17-20,25,共5页Shanghai Metals

摘　　要：先用Thermo-Calc软件计算了不同温度下Nb、Ti、C等元素及其化合物的溶解行为,然后考察不同固溶温度和固溶时间对Nb微合金钢中微合金元素溶解行为的影响,且利用电阻率、硬度和XRD等手段对其进行分析。研究结果表明,电阻率和硬度随着固溶温度的升高而上升,1 200℃以上趋于平缓,说明Nb微合金元素的完全固溶温度为1 200℃左右,与Thermo-Calc软件计算基本一致。此外,固溶时间对点阵常数c变化的影响要大于点阵常数a,且c/a轴比随着固溶时间的增加逐渐增大,当试样固溶5 min后,c/a轴比趋于平缓,固溶相对较为充分。The dissolve behavior of Nb, C, Ti and their compounds were calculated at different temperatures by using Thermo-Calc software. Meanwhile, the influence of different dissolve temperatures and dissolve times on the dissolve characteristics for Nb micro alloyed steel was also investigated by resistivity, hardness and XRD methods. The research results showed that the resistivity and hardness increased with the increasing of dissolve temperature, however, they did not greatly increase over 1 200 ℃, which illustrated the Nb micro alloyed element completely dissolved at about 1 200 ℃, which agreed well with the result calculated by Thermo-Calc software. In addition, the impact of the dissolve time on lattice constant c was larger than that of a, and c/a axial ratio increase of gradually with the increase of dissolve time. When the dissolve time was controlled about 5 min, c/a ratio became flat, which demonstrated the elements almost dissolved completely.

关 键 词：NB微合金钢 碳化物 溶解行为 固溶 

分 类 号：TG142.33[一般工业技术—材料科学与工程]