Effects of slag composition and alloy content as well as temperature on the deoxidation and desulfurization of Inconel 718 superalloy by CaF 2 -CaO-Al 2 O 3 -MgO-TiO 2 ESR-type slag without the addition of a deoxidizer were systematically investigated by laboratory-scale experiments and the developed mass transfer model. The model predictions were verified through comparison with experimental results in a double-layer crucible. The results showed that the oxygen content decreased with an increase of CaO, MgO and CaF 2 content in the slag at 1773 K, and CaO has a great influence on the deoxidation of Inconel 718 alloy compared with MgO and CaF 2 in slag, which was responsible for the decrease in equilibrium content of sulfur in the Inconel 718 alloy. The total oxygen and sulfur content decreased from 33.2 and 20 ppm in master alloys to about 10 and 6 ppm in alloy ingots at 1773 K, respectively. Properly increasing the Al and Ti content only lowered the oxygen and sulfur content in the nickel-based alloy to a limited extent when satisfying the mechanical properties of the Inconel 718 alloy. The interfacial oxygen content increased with increasing temperature, giving rise to a decrease in the desulfurization ratio $$ \left( {{{[{\text{pct S}}]_{t = t} } \mathord{\left/ {\vphantom {{[{\text{pct S}}]_{t = t} } {[{\text{pct S}}]_{t = 0} }}} \right. \kern-0pt} {[{\text{pct S}}]_{t = 0} }}} \right) $$ [ pct S ] t = t / [ pct S ] t = 0 . These results show that the lower temperature favored desulfurization of the nickel-based alloy.

中文翻译：

---

炉渣成分对不添加脱氧剂的ESR型炉渣对Inconel 718高温合金脱氧脱硫的影响

实验室系统研究了炉渣成分、合金含量和温度对CaF 2 -CaO-Al 2 O 3 -MgO-TiO 2 ESR型炉渣对Inconel 718高温合金脱氧脱硫的影响规模实验和开发的传质模型。通过与双层坩埚中的实验结果进行比较，验证了模型预测。结果表明，1773 K时，随着渣中CaO、MgO和CaF 2 含量的增加，氧含量降低，与渣中的MgO和CaF 2 相比，CaO对Inconel 718合金的脱氧影响较大。 Inconel 718 合金中硫的平衡含量降低的原因。总氧和硫含量从 33 下降。在 1773 K 时，母合金中的浓度分别为 2 和 20 ppm，合金锭中的浓度分别为 10 和 6 ppm。在满足Inconel 718合金力学性能的前提下，适当增加Al和Ti含量只会在一定程度上降低镍基合金中的氧和硫含量。界面氧含量随温度升高而增加，导致脱硫率下降 $$ \left( {{{[{\text{pct S}}]_{t = t} } \mathord{\left/ { \vphantom {{[{\text{pct S}}]_{t = t} } {[{\text{pct S}}]_{t = 0} }}} \right. \kern-0pt} { [{\text{pct S}}]_{t = 0} }}} \right) $$ [ pct S ] t = t / [ pct S ] t = 0 。这些结果表明较低的温度有利于镍基合金的脱硫。在满足Inconel 718合金力学性能的前提下，适当增加Al和Ti含量只会在一定程度上降低镍基合金中的氧和硫含量。界面氧含量随温度升高而增加，导致脱硫率降低 $$ \left( {{{[{\text{pct S}}]_{t = t} } \mathord{\left/ { \vphantom {{[{\text{pct S}}]_{t = t} } {[{\text{pct S}}]_{t = 0} }}} \right. \kern-0pt} { [{\text{pct S}}]_{t = 0} }}} \right) $$ [ pct S ] t = t / [ pct S ] t = 0 。这些结果表明较低的温度有利于镍基合金的脱硫。在满足Inconel 718合金力学性能的前提下，适当增加Al和Ti含量只会在一定程度上降低镍基合金中的氧和硫含量。界面氧含量随温度升高而增加，导致脱硫率降低 $$ \left( {{{[{\text{pct S}}]_{t = t} } \mathord{\left/ { \vphantom {{[{\text{pct S}}]_{t = t} } {[{\text{pct S}}]_{t = 0} }}} \right. \kern-0pt} { [{\text{pct S}}]_{t = 0} }}} \right) $$ [ pct S ] t = t / [ pct S ] t = 0 。这些结果表明较低的温度有利于镍基合金的脱硫。导致脱硫率下降 $$ \left( {{{[{\text{pct S}}]_{t = t} } \mathord{\left/ {\vphantom {{[{\text{ pct S}}]_{t = t} } {[{\text{pct S}}]_{t = 0} }}} \right.\kern-0pt} {[{\text{pct S}} ]_{t = 0} }}} \right) $$ [ pct S ] t = t / [ pct S ] t = 0 。这些结果表明较低的温度有利于镍基合金的脱硫。导致脱硫率下降 $$ \left( {{{[{\text{pct S}}]_{t = t} } \mathord{\left/ {\vphantom {{[{\text{ pct S}}]_{t = t} } {[{\text{pct S}}]_{t = 0} }}} \right.\kern-0pt} {[{\text{pct S}} ]_{t = 0} }}} \right) $$ [ pct S ] t = t / [ pct S ] t = 0 。这些结果表明较低的温度有利于镍基合金的脱硫。