金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 133-140.DOI: 10.13251/j.issn.0254-6051.2025.07.019

• 材料研究 • 上一篇    下一篇

316H奥氏体不锈钢中δ-铁素体的变化规律

邢梦楠1,2, 欧阳鑫1,2, 胡昕明1,2, 刘晨希1,2, 白云峰1,2, 王勇1,2, 杨成1,2, 王晓航1,2   

  1. 1.海洋装备用金属材料及其应用国家重点实验室, 辽宁 鞍山 114009;
    2.鞍钢股份有限公司 技术中心, 辽宁 鞍山 114009
  • 收稿日期:2025-01-20 修回日期:2025-04-29 出版日期:2025-07-25 发布日期:2025-07-28
  • 作者简介:邢梦楠(1992—),女,工程师,硕士,主要研究方向为中厚板材料开发,E-mail:847967099@qq.com

Variation law of δ-ferrite in 316H austenitic stainless steel

Xing Mengnan1,2, Ouyang Xin1,2, Hu Xinming1,2, Liu Chenxi1,2, Bai Yunfeng1,2, Wang Yong1,2, Yang Cheng1,2, Wang Xiaohang1,2   

  1. 1. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
    2. Technology Center, Angang Steel Company Limited, Anshan Liaoning 114009, China
  • Received:2025-01-20 Revised:2025-04-29 Online:2025-07-25 Published:2025-07-28

摘要: 针对316H不锈钢中高温δ-铁素体的形成与控制进行研究分析。结果表明,δ-铁素体主要在凝固过程中由于Cr和Mo元素的富集而形成,其凝固模式为铁素体奥氏体(FA)模式。凝固冷却速度和形变及热处理对δ-铁素体的含量和组织形态有显著影响。随冷却速度增大,316H钢中δ-铁素体含量增加,且组织细小、弥散分布。冷变形和热处理相结合,可大幅促进316H钢中δ-铁素体的溶解。冷速5 ℃/min下所得316H钢,经冷变形+1050 ℃×15 min热处理后,δ-铁素体含量可控制在0.0254%的较低水平。

关键词: 奥氏体不锈钢, 凝固, 冷变形, 热处理, δ-铁素体, 变化规律

Abstract: Formation and control of high-temperature δ-ferrite in 316H stainless steel were studied and analyzed. The results show that δ-ferrite is mainly formed during the solidification process due to the enrichment of Cr and Mo elements, and its solidification mode is ferrite austenite (FA) mode. The cooling rate of solidification, deformation and heat treatment have significant effect on the content and morphology of δ-ferrite. With the increase of cooling rate, the content of δ-ferrite in the 316H steel increases, and the microstructure is fine and dispersively distributed. The combination of cold deformation and heat treatment can significantly promote the dissolution of δ-ferrite in the 316H steel. The 316H steel obtained at cooling rate of 5 ℃/min, after cold deformation and heat treatment at 1050 ℃ for 15 min, the δ-ferrite content can be controlled at a relatively low level of 0.0254%.

Key words: austenitic stainless steel, solidification, cold deformation, heat treatment, δ-ferrite, variation law

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