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为了探讨钢中细小夹杂物的形成机制,采用扫描电镜和能谱仪表征了钢中夹杂物的形貌、尺寸、成分及数量,理论计算了脱氧产物的生成优势区图,讨论了夹杂物长大的影响因素.钢中夹杂物的组成以Mg O-Al2O3-Ti Ox为核心,表面包裹析出Mn S,钢液中未发现单独的Al2O3和Ti Ox夹杂;夹杂物的形貌为近球形,平均尺寸为1μm左右,数量在1000 mm-2以上.镁含量较高的钢中含有少量以Mg O-Al2O3和Mg O为核心的夹杂物,不利于夹杂物的球形化,镁含量宜控制在50×10-6以下.镁的脱氧能力强,形核临界尺寸小、形核数量多以及钢液中镁、铝和钛复合脱氧的高熔点产物的特性有效地控制了钢中夹杂物的扩散与碰撞长大趋势.
In order to investigate the formation mechanism of small inclusions in steel, the morphology, size, composition and amount of inclusions in steel were characterized by scanning electron microscopy and energy dispersive spectroscopy. Large influencing factors.The composition of inclusions in steel is mainly composed of Mg O-Al2O3-Ti Ox, MnS is precipitated on the surface, and there is no single inclusion of Al2O3 and Ti Ox in the molten steel; the morphology of inclusions is nearly spherical, The average size is about 1μm, the number is above 1000 mm-2.Magnesium content of the steel containing a small amount of MgO-Al2O3 and MgO as the core inclusions, is not conducive to the inclusion of spherical, magnesium content should be controlled at 50 × 10-6 or less.Magnesium deoxidation ability, the critical nucleation size is small, the number of nuclei and molten steel magnesium, aluminum and titanium composite deoxidation of high melting point product characteristics effectively control the diffusion of inclusions in steel With the collision grew up.