Abstract: This study aims to optimize the homogenization process of 316H austenitic stainless steel slabs through simulation calculations using the Thermo-Calc software， with the goal of reducing the high-temperature ferrite content in the final product. The equilibrium and non-equilibrium solidification path simulations were conducted， in combination with metallographic analysis of actual cast slab samples， to determine the optimal homogenization heat treatment parameters， thus effectively reducing the ferrite content.Prior to optimization， the slab was homogenized at 1 250 ℃ for 1 000 minutes， resulting in a final product ferrite content of 3% to 4%. Through improvements to the homogenization process， the process was adjusted to two stages，： the first stage involved holding at 1 250 ℃ for 250 minutes， followed by the second stage at 1 180 ℃ for 250 minutes. The optimized process reduced the ferrite content in the finished product to below 1%， while significantly improving the material's microstructure. After the process optimization， the tensile strength and impact toughness of the finished product at room temperature met the material standard requirements. Moreover， the experimental results indicate that adjusting the homogenization temperature and holding time effectively promotes the transformation of ferrite to austenite and reduces the segregation within the solid solution.

Key words: 316H, Scheil Solidification, Thermo-calc Simulation Calculations, Slab Homogenization, High Temperature Ferrite

摘要： 通过Thermo-Calc软件的模拟计算，寻求优化316H奥氏体不锈钢板坯的均匀化工艺，以降低最终产品中的高温铁素体含量。采用平衡和非平衡凝固路径模拟，结合实际铸坯样品的金相组织分析，确定了最佳的均匀化热处理参数，从而有效减少铁素体含量。优化前铸坯均匀化热处理温度为1 250 ℃，保温时间1 000 min，最终成品铁素体含量为3%~4%。通过改进均匀化工艺，将工艺调整为两阶段处理，第一阶段在1 250 ℃下保温250 min，第二阶段在1 180 ℃保温250 min。优化后的工艺将成品铁素体含量降低至1%以下，同时，显著改善了材料的显微组织。工艺优化后，成品的室温拉伸强度和冲击韧性均满足材料标准要求。此外，实验结果表明，调整均匀化温度和保温时间可有效促进铁素体向奥氏体的转变，并减少固溶体内偏析现象。

关键词: 316H, Scheil凝固, Thermo-calc模拟计算, 板坯均匀化, 高温铁素体