The Effect of Composite Treatment with Boron and Cerium on Solidification and Precipitation of S32654 Stainless Steel

Yu Jiangtao; Zhang Shucai; Zhou Jie; Li Huabing; Jiang Zhouhua

doi:10.20057/j.1003-8620.N250514

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The Effect of Composite Treatment with Boron and Cerium on Solidification and Precipitation of S32654 Stainless Steel

Smelting and Solidification | 更新时间：2025-11-06

- The Effect of Composite Treatment with Boron and Cerium on Solidification and Precipitation of S32654 Stainless Steel
- Special Steel Vol. 46, Issue 6, Pages: 95-103(2025)
- 作者机构：
  
  1.东北大学冶金学院，沈阳 110819
  2.宝山钢铁股份有限公司中央研究院，上海 201999
  3.中信金属股份有限公司，北京100027
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250514
  CLC： TF03
- Received：11 August 2025，
  
  Revised：2025-09-22，
  
  Accepted：23 September 2025，
  
  Published：30 November 2025
- 稿件说明：
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禹江涛,张树才,周杰等.硼和铈复合处理对S32654不锈钢凝固和析出的影响[J].特殊钢,2025,46(06):95-103.

Yu Jiangtao,Zhang Shucai,Zhou Jie,et al.The Effect of Composite Treatment with Boron and Cerium on Solidification and Precipitation of S32654 Stainless Steel[J].Special Steel,2025,46(06):95-103.
禹江涛,张树才,周杰等.硼和铈复合处理对S32654不锈钢凝固和析出的影响[J].特殊钢,2025,46(06):95-103. DOI： 10.20057/j.1003-8620.N250514.

Yu Jiangtao,Zhang Shucai,Zhou Jie,et al.The Effect of Composite Treatment with Boron and Cerium on Solidification and Precipitation of S32654 Stainless Steel[J].Special Steel,2025,46(06):95-103. DOI： 10.20057/j.1003-8620.N250514.

摘要

超级奥氏体不锈钢合金含量极高，带来优异性能的同时导致了枝晶组织粗大、偏析严重和析出敏感性强等瓶颈问题，调控超级奥氏体不锈钢凝固组织和析出行为至关重要。本研究在超级奥氏体不锈钢S32654的基础上进行了B和Ce复合处理，系统研究了B和Ce复合处理对凝固组织和时效析出行为的影响。结果表明，经

［B］0.002%和

［Ce］0.035%复合处理后，凝固过程中，夹杂物均已变性为含Ce夹杂，数量密度和尺寸均增大，且无硼化物形成；枝晶组织显著细化，二次枝晶间距减小25%；σ相数量增多，尺寸明显减小；Mo元素偏析明显减轻，凝固组织得到显著改善。时效析出过程中，Ce显著增加σ相和Cr

N形核位点的作用占主导，促进了其形核；B和Ce可共同抑制σ相生长，大幅减小其尺寸，但对Cr

N的生长影响不大。总体而言，B和Ce复合处理对S32654凝固组织和时效析出具有良好的改善效果。

Abstract

The high alloy content of super austenitic stainless steel brings excellent performance， but also leads to bottleneck problems such as coarse dendritic structure， severe segregation， and strong precipitation sensitivity. It is crucial to regulate the solidification structure and precipitation behavior of super austenitic stainless steel. In this paper， B and Ce composite treatment was carried out on the basis of super austenitic stainless steel S32654， and the effects of B and Ce composite treatment on solidification structure and aging precipitation behavior were systematically studied.The results showed that after composite treatment with 0.002% B and 0.035% Ce， during the solidification process， the inclusions all transform into Ce containing inclusions with increased number density and size， and no borides form； The dendritic structure is significantly refined， and the secondary dendrite spacing is reduced by 25%； The number of σ phases increases and the size significantly decreases； The segregation of Mo element significantly reduces， and the solidification structure is significantly improved. During the aging precipitation process， Ce significantly increases the role of the σ phase and Cr

N nucleation sites， slightly promoting their nucleation； B and Ce can jointly inhibit the growth of the σ phase， significantly reducing its size， but have little effect on the growth of Cr

N. Overall， the composite treatment of B and Ce has a good improvement effect on the solidification structure and aging precipitation of S32654.

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Keywords

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