碲处理控制Y15易切削钢中MnS夹杂物形貌
发布时间：2019-04-22 19:19
【摘要】：为了研究碲对钢中MnS夹杂物形貌的影响,针对Y15高硫易切削钢,利用SEM-EDS扫面电镜,结合FactSage热力学计算,分析了不同碲质量分数对钢中MnS夹杂物形貌、尺寸、长宽比的影响,同时探讨了稀散金属碲对MnS夹杂物形貌控制的机理。研究结果表明,钢液中加碲后,在MnS夹杂物的外环形成了碲、锰、铁的复合相。钢中加碲后MnS夹杂物的形貌和分布大幅度改变,当碲硫比为0.05时,链状MnS夹杂物大幅度减少,球状MnS夹杂物数量增加;当碲硫比增加到0.2时,链状MnS夹杂物基本消失;当碲硫比增加到0.5时,MnS夹杂物形貌的变化不再明显。钢中加碲显著降低了MnS夹杂物的长宽比,控制MnS夹杂物长宽比最合适的碲硫比为0.2。FactSage计算结果表明,MnTe的生成温度为1900℃,在MnS的析出温度下,MnTe是作为液态夹杂物存在的。在凝固过程中,MnTe和MnS发生固溶现象,由于MnTe为液态,两者形成的固溶体会趋于球形生长。
[Abstract]:In order to study the effect of tellurium on the morphology of MnS inclusions in steel, the effects of different tellurium contents on the morphology, size and aspect ratio of MnS inclusions in Y15 high sulfur cutting steel were analyzed by SEM-EDS scanning electron microscope and FactSage thermodynamic calculation. At the same time, the mechanism of controlling the morphology of MnS inclusion by the dispersed metal tellurium was discussed. The results show that the compound phases of tellurium, manganese and iron are formed in the outer ring of MnS inclusions after tellurium is added to the molten steel. After adding tellurium, the morphology and distribution of MnS inclusions changed greatly. When the ratio of tellurium to sulfur was 0.05, the chain MnS inclusions decreased greatly and the number of spherical MnS inclusions increased, and when the tellurium sulfur ratio increased to 0.2, the chain MnS inclusions basically disappeared. When the ratio of tellurium to sulfur increases to 0.5, the morphology of MnS inclusions is no longer obvious. The addition of tellurium in steel significantly reduced the aspect ratio of MnS inclusion, and the most suitable ratio of tellurium to sulfur for controlling the ratio of length to width of MnS inclusion was calculated by 0.2.FactSage. The results show that the formation temperature of MnTe is 1900 鈩，
本文编号：2463124
[Abstract]:In order to study the effect of tellurium on the morphology of MnS inclusions in steel, the effects of different tellurium contents on the morphology, size and aspect ratio of MnS inclusions in Y15 high sulfur cutting steel were analyzed by SEM-EDS scanning electron microscope and FactSage thermodynamic calculation. At the same time, the mechanism of controlling the morphology of MnS inclusion by the dispersed metal tellurium was discussed. The results show that the compound phases of tellurium, manganese and iron are formed in the outer ring of MnS inclusions after tellurium is added to the molten steel. After adding tellurium, the morphology and distribution of MnS inclusions changed greatly. When the ratio of tellurium to sulfur was 0.05, the chain MnS inclusions decreased greatly and the number of spherical MnS inclusions increased, and when the tellurium sulfur ratio increased to 0.2, the chain MnS inclusions basically disappeared. When the ratio of tellurium to sulfur increases to 0.5, the morphology of MnS inclusions is no longer obvious. The addition of tellurium in steel significantly reduced the aspect ratio of MnS inclusion, and the most suitable ratio of tellurium to sulfur for controlling the ratio of length to width of MnS inclusion was calculated by 0.2.FactSage. The results show that the formation temperature of MnTe is 1900 鈩，
本文编号：2463124
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