Mn18Cr18N护环钢工艺的基础研究
发布时间：2018-11-24 12:48
【摘要】：Mn18Cr18N护环钢作为高氮钢中一种具有优异的抗高强度、抗应力耐腐蚀性能的钢种,其研究和冶炼受到国内外的高度重视。因此对Mn18Cr18N护环钢冶炼的理论基础及其材料性能的深入研究对于推动我国护环钢的制备具有重要的意义。通过引用规则溶液的性质,建立了钢液增氮的热力学模型,分析了不同因素对增氮的影响,并将溶解度模型与实际结果进行对比；分析了不同情况下增氮动力学的限制环节,为实际操作起到一定的指导作用；分析了钢液凝固时氮偏析出的控制要素,为防止氮在钢液凝固时的析出提供了理论依据。通过在常压下进行增氮的实验研究,分析了采用氮气增氮与氮化合金增氮的增氮效果,得出了采用氮气和氮化合金一起增氮效果和经济性最佳、在采用氮化合金增氮的最佳冶炼温度；分析了冶炼温度对增氮的影响,得出采用氮气增氮时最佳冶炼温度为1650℃,采用氮化合金增氮时最佳冶炼温度为1550℃。通过采用真空感应炉+氮气保护电渣重熔双联工艺制备出氮含量均在0.63%以上的Mn18Cr18N钢；分析电渣重熔锭不同参数对电渣重熔制备Mn18Cr18N钢质量的影响。通过采用Procast软件对Mn18Cr18N护环钢进行微观组织模拟研究,分析了不同工艺参数对微观组织形貌、晶粒数量、晶粒平均半径、二次枝晶间距的影响,得出了最佳的凝固参数,可使晶粒数量增加了30.58%,晶粒平均半径减小了38.39%,二次枝晶间距减少了21.34%,为制备高质量Mn18Cr18N钢的实际生产提供了指导作用。通过对电渣重熔后的Mn18Cr18N电渣锭进行热加工性能研究,分析了Mn18Cr18N护环钢的高温拉伸力学性能、常温拉伸断裂形貌及断裂机理分析以及高温热塑性,可以得知在温度为850℃～950℃区间及1100℃～1250℃区间的热塑性好于950℃～1050℃区间。Mn18Cr18N热加工区域应控制在1100℃～1250℃区间以避免铁素体组织的产生和产品开裂。
[Abstract]:As a kind of high nitrogen steel with excellent resistance to high strength and stress and corrosion resistance, the research and smelting of Mn18Cr18N ring steel have been attached great importance to at home and abroad. Therefore, it is of great significance to study the theoretical basis and material properties of Mn18Cr18N ring steel smelting in order to promote the preparation of protecting ring steel in China. By quoting the properties of regular solution, the thermodynamic model of nitrogen increasing in liquid steel was established, the influence of different factors on nitrogen increasing was analyzed, and the solubility model was compared with the actual results. The limiting links of nitrogen increasing dynamics under different conditions are analyzed, which will play a guiding role in practical operation, and the controlling factors of nitrogen segregation during liquid steel solidification are analyzed, which provides a theoretical basis for preventing nitrogen from precipitating during liquid steel solidification. Through the experimental study of nitrogen increasing under normal pressure, the effect of nitrogen increasing by nitrogen gas and nitriding alloy is analyzed. The results show that nitrogen gas and nitride alloy together increase nitrogen effect and economy best. The optimum melting temperature of nitrided alloy for increasing nitrogen; The effect of smelting temperature on nitrogen increase is analyzed. The optimum smelting temperature is 1650 鈩，
本文编号：2353774
[Abstract]:As a kind of high nitrogen steel with excellent resistance to high strength and stress and corrosion resistance, the research and smelting of Mn18Cr18N ring steel have been attached great importance to at home and abroad. Therefore, it is of great significance to study the theoretical basis and material properties of Mn18Cr18N ring steel smelting in order to promote the preparation of protecting ring steel in China. By quoting the properties of regular solution, the thermodynamic model of nitrogen increasing in liquid steel was established, the influence of different factors on nitrogen increasing was analyzed, and the solubility model was compared with the actual results. The limiting links of nitrogen increasing dynamics under different conditions are analyzed, which will play a guiding role in practical operation, and the controlling factors of nitrogen segregation during liquid steel solidification are analyzed, which provides a theoretical basis for preventing nitrogen from precipitating during liquid steel solidification. Through the experimental study of nitrogen increasing under normal pressure, the effect of nitrogen increasing by nitrogen gas and nitriding alloy is analyzed. The results show that nitrogen gas and nitride alloy together increase nitrogen effect and economy best. The optimum melting temperature of nitrided alloy for increasing nitrogen; The effect of smelting temperature on nitrogen increase is analyzed. The optimum smelting temperature is 1650 鈩，
本文编号：2353774
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