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本文探讨了渣面温度对高温合金电渣重熔过程中Al,Ti控制的影响及金属熔池/渣池界面温度分布与锭表面质量的关系。当结晶器对底水箱不绝缘时,渣面温度较高,熔炼后期氧从大气向渣中转移速度v_(s-g)~(O_2)比绝缘时大2—3倍;熔炼前期增Al倾向比绝缘时大。炉口电压增加,渣面温度升高,Ti烧损量加大。试验条件下,电压增加1V,Ti烧损量约增加0.03%。金属熔池/渣池界面温度分布可用公式t=ae~(B/d) (B<0)来描述,它对电渣重熔锭表面质量具有决定性影响。文中提出了确定这一分布的方法。锭表面质量可用重熔过程中渣皮厚度的变化来衡量。渣皮厚度δ=B/(1nt_l-1na)。渣池内电流密度分布及结晶器壁附近的热传导条件、渣的液相线温度以及所有影响“高温区间”温度的因素的变化均可导致锭表面质量的改变。
In this paper, the effect of slag surface temperature on the Al and Ti control during the ESR process of high temperature alloy and the relationship between the interface temperature distribution and ingot surface quality of the metal bath / slag bath were discussed. When the crystallizer is not insulated from the bottom water tank, the temperature of the slag surface is higher, and the transfer rate of oxygen from the atmosphere to the slag in the late stage of melting is 2-3 times higher than that of the slag during the late stage of smelting; When big. Furnace mouth voltage increases, the surface temperature increases, Ti burning increased. Under the test conditions, the voltage increases by 1V, and the Ti burning loss increases about 0.03%. The temperature distribution of metal bath / slag bath interface can be described by the formula t = ae ~ (B / d) (B <0), which has a decisive influence on the surface quality of ESR ingot. The paper proposes a method to determine this distribution. The surface quality of the ingot can be measured by the change of the thickness of the skimmer in the remelting process. Scum thickness δ = B / (1nt_l-1na). The current density distribution in the slag pool and the heat conduction conditions near the mold wall, the liquidus temperature of the slag and all the factors that affect the temperature in the “high temperature zone” can lead to changes in ingot surface quality.