The evolution of sulfides in nonoriented silicon steels during the heating process is investigated through chemical composition analysis and thermodynamic calculation. Evolution behaviors of sulfides are analyzed using field emission scanning electron microscope (FESEM) and automatic scanning electron microscope (ASPEX). A homogeneous complex sulfide is detected containing magnesium and manganese. The different proportions of MgS and MnS in the complex sulfide are due to the competition between Mg, Mn, and S in low‐sulfur steel. Sulfides and compounds containing sulfides, oxides, and nitrides are mainly formed during the heating temperature of 1000 °C. The presence of sulfides and compounds with sulfide and oxide is at the temperature of 1300 °C. Sulfides reach equilibrium in less time than AlN at 1000 °C, while the time for sulfides to reach the theoretical equilibrium value takes precedence over oxides at 1300 °C. In addition, the proportions of various types of precipitation at 1300 and 1000 °C are discussed through the theoretical calculation and the observation results.

中文翻译：

---

加热过程中无取向硅钢中硫化物的释放

通过化学成分分析和热力学计算，研究了无取向硅钢在加热过程中硫化物的演变。使用场发射扫描电子显微镜（FESEM）和自动扫描电子显微镜（ASPEX）分析了硫化物的析出行为。检测到均质的复合硫化物，其中含有镁和锰。MgS和MnS在复合硫化物中的比例不同是由于低硫钢中Mg，Mn和S之间的竞争所致。硫化物和含有硫化物，氧化物和氮化物的化合物主要在1000°C的加热温度下形成。硫化物以及具有硫化物和氧化物的化合物的存在温度为1300°C。在1000°C的温度下，硫化物达到平衡的时间比AlN短，在1300°C时，硫化物达到理论平衡值的时间优先于氧化物。此外，通过理论计算和观测结果，讨论了1300和1000°C下各种类型降水的比例。