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应用TEM、HREM、X射线衍射等方法分析了薄板坯连铸连轧EAF-CSP工艺生产的钛微合金钢热轧板的含钛析出相,钢的化学成分(质量分数,%)为:C 0.04~0.07、Si≤0.6、Mn≤0.6、Ti 0.06~0.14。结果表明:试验钢中存在不同碳氮比的碳氮化钛,其C/N比值之差是由各析出相的形成温度及析出时钛和氮、碳在钢中的过饱和度不同造成的。试验钢萃取粉末的质量分数约占钢的0.305%。其中70%以上为渗碳体,其余的主要是钛的碳化物、氮化物和碳氮化物以及少量硫化物和氧化物。添加钛明显增加了细小析出相的数量。在CSP工艺连铸坯及热轧板中均观察到由相间沉淀方式形成的碳氮化物粒子列。讨论了相间沉淀的形成机制。
The titanium-containing precipitates of titanium microalloyed steel hot rolled plate produced by EAF-CSP process of thin slab continuous casting and rolling were analyzed by TEM, HREM and X-ray diffraction. The chemical composition (mass fraction,%) of the steel is C 0.04 to 0.07, Si ≦ 0.6, Mn ≦ 0.6, and Ti 0.06 to 0.14. The results show that there are different C / N ratios of titanium carbonitride in the test steel, and the difference of C / N ratio is caused by the formation temperature of each precipitated phase and the difference of supersaturation of titanium and nitrogen during precipitation . Test steel extract powder mass fraction of steel accounted for about 0.305%. More than 70% of them are cementite, the rest are mainly titanium carbides, nitrides and carbonitrides and a small amount of sulfides and oxides. Addition of titanium significantly increased the number of fine precipitates. In the CSP process of continuous casting slab and hot-rolled plate were observed by the phase precipitation of carbonitride particles formed column. The formation mechanism of interphase precipitation is discussed.