Ti-Mg复合脱氧和硫含量对钢中夹杂物特征及MnS析出行为的影响
发布时间：2018-08-03 22:07
【摘要】：采用扫描电镜/能谱仪表征了管线钢中夹杂物的形貌、尺寸、成分及数量,考察了不同Ti/Mg比的钢中夹杂物特征、硫含量及脱氧产物数量对MnS析出行为的影响,并进行了热力学计算.结果表明:Ti-Mg脱氧钢中夹杂物以Mg O-Al2O3-Ti2O3、Mg O-Ti2O3或Mg O为核心,表面包裹或局部析出MnS,粒径小于1.3μm,数量为300~450 mm-2,形貌为圆形、多边形和方形;夹杂物中Ti/Mg原子数比为0.05~0.2时,夹杂物细小且近圆形;随硫含量减少,凝固过程中MnS析出倾向减小,MnS在夹杂物表面由包裹析出向局部析出转变,提高氧化物夹杂数量,有利于细小MnS的包裹或局部异质形核;Ti-Mg复合脱氧产物细小、弥散,可作为MnS异质形核核心,可同时降低MnS及氧化物的危害.
[Abstract]:The morphology, size, composition and quantity of inclusions in pipeline steel were characterized by SEM / EDS. The effects of inclusion characteristics, sulfur content and amount of deoxidized products on the precipitation behavior of MnS in steel with different Ti/Mg ratios were investigated. Thermodynamic calculation was also carried out. The results show that the inclusions in the deoxidized steel are MgO-Al _ 2O _ 3-Ti _ 2O _ 3, mg O-Ti2O3 or MgO as the core, the surface encapsulates or precipitates MNS locally, the particle size is less than 1.3 渭 m, the quantity is 300 ~ 450mm-2, the shape is circular, polygon and square, and the ratio of Ti/Mg atoms in the inclusions is 0.05 ~ 0.2. With the decrease of sulfur content, the precipitation tendency of MnS in the solidification process decreases, and the precipitate changes from encapsulation to local precipitation on the surface of inclusions, thus increasing the amount of oxide inclusions. The Ti-Mg compound deoxidized product which is advantageous to the encapsulation of small MnS or local heterogeneous nucleation can be used as the heterogeneous nucleus of MnS and can reduce the harm of MnS and oxide at the same time.
【作者单位】： 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室;
【基金】：国家自然科学基金资助项目(51104109) 湖北省自然科学基金创新群体资助项目(2008CDA010) 武汉科技大学科研启动经费资助项目(010328)
【分类号】：TG142.1
[Abstract]:The morphology, size, composition and quantity of inclusions in pipeline steel were characterized by SEM / EDS. The effects of inclusion characteristics, sulfur content and amount of deoxidized products on the precipitation behavior of MnS in steel with different Ti/Mg ratios were investigated. Thermodynamic calculation was also carried out. The results show that the inclusions in the deoxidized steel are MgO-Al _ 2O _ 3-Ti _ 2O _ 3, mg O-Ti2O3 or MgO as the core, the surface encapsulates or precipitates MNS locally, the particle size is less than 1.3 渭 m, the quantity is 300 ~ 450mm-2, the shape is circular, polygon and square, and the ratio of Ti/Mg atoms in the inclusions is 0.05 ~ 0.2. With the decrease of sulfur content, the precipitation tendency of MnS in the solidification process decreases, and the precipitate changes from encapsulation to local precipitation on the surface of inclusions, thus increasing the amount of oxide inclusions. The Ti-Mg compound deoxidized product which is advantageous to the encapsulation of small MnS or local heterogeneous nucleation can be used as the heterogeneous nucleus of MnS and can reduce the harm of MnS and oxide at the same time.
【作者单位】： 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室;
【基金】：国家自然科学基金资助项目(51104109) 湖北省自然科学基金创新群体资助项目(2008CDA010) 武汉科技大学科研启动经费资助项目(010328)
【分类号】：TG142.1
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