高钛低碳钢中Nb、Ti的析出行为
Precipitation of Nb and Ti in Low Carbon Steel with High Titanium
杨 颖, 侯华兴, 史乃安, 李向科
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作者单位：鞍钢股份有限公司技术中心, 辽宁 鞍山 114001
中文关键字：析出； 热力学计算； 凝固； 铌； 钛
英文关键字：precipitation; thermodynamic calculation; solidification; Nb; Ti
中文摘要：通过热力学计算和实验观察，对一种高钛含铌钢中Nb、Ti的析出行为进行研究。结果表明：实验钢中的铌的氮化物和碳化物在液相和凝固过程中不能生成；氮化钛在凝固过程中析出，碳化钛在凝固末期形成；在奥氏体相中，实验钢中的Nb、Ti碳氮化物析出的先后顺序为TiN>Nb(CN)>NbC>TiC；铸坯中的析出相主要为氮化钛，而成品板材的二相粒子均为Ti、Nb复合的C、N化物。
英文摘要：The precipitation of Nb, Ti in low carbon steel with high titanium was researched by means of thermodynamic calculation and experiment observation. The results show that (Nb, Ti) carbides and nitrides aren't able to form in liquid phase and socidification process. But TiN precipitates during solidification and TiC precipitates in the end of solidification. The precipitation sequence of Nb-Ti(C, N) is as follows: TiN>Nb(CN) >NbC >TiC. And TiN and Nb-Ti(C, N) is the main precipitants of the steel as- cast or as-rolled, respectively.