Solidification Properties and Ferrite Distribution Characteristics of 316H Austenitic Stainless Steel Calculated Based on Thermo-Calc

Zhao Dejiang; Pan Jixiang; Hu Huanzhang; Chen Xingrun

doi:10.20057/j.1003-8620.2024-00245

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Solidification Properties and Ferrite Distribution Characteristics of 316H Austenitic Stainless Steel Calculated Based on Thermo-Calc

Smelting and Solidification | 更新时间：2025-05-09

- Solidification Properties and Ferrite Distribution Characteristics of 316H Austenitic Stainless Steel Calculated Based on Thermo-Calc
- Special Steel Vol. 46, Issue 3, Pages: 28-33(2025)
- 作者机构：
  
  1.酒钢集团宏兴钢铁股份有限公司钢铁研究院不锈钢研究所，嘉峪关 735100
  2.酒钢集团宏兴钢铁股份有限公司不锈钢分公司，嘉峪关 735100
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2024-00245
  CLC： TG141
- Received：10 October 2024，
  
  Published：30 May 2025
- 稿件说明：
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赵得江,潘吉祥,胡桓彰等.基于Thermo-Calc计算的316H奥氏体不锈钢凝固特性与铁素体分布特性[J].特殊钢,2025,46(03):28-33.

Zhao Dejiang,Pan Jixiang,Hu Huanzhang,et al.Solidification Properties and Ferrite Distribution Characteristics of 316H Austenitic Stainless Steel Calculated Based on Thermo-Calc[J].Special Steel,2025,46(03):28-33.
赵得江,潘吉祥,胡桓彰等.基于Thermo-Calc计算的316H奥氏体不锈钢凝固特性与铁素体分布特性[J].特殊钢,2025,46(03):28-33. DOI： 10.20057/j.1003-8620.2024-00245.

Zhao Dejiang,Pan Jixiang,Hu Huanzhang,et al.Solidification Properties and Ferrite Distribution Characteristics of 316H Austenitic Stainless Steel Calculated Based on Thermo-Calc[J].Special Steel,2025,46(03):28-33. DOI： 10.20057/j.1003-8620.2024-00245.

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。

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.

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references

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