金属热处理 ›› 2025, Vol. 50 ›› Issue (8): 169-176.DOI: 10.13251/j.issn.0254-6051.2025.08.027

• 工艺研究 • 上一篇    下一篇

Inconel 625合金组织与性能的模拟计算与高通量试验

刘文月1,2, 李天怡1,2, 巩俐1,2, 任毅1,3, 杨博威1,2, 安涛1,2   

  1. 1.海洋装备金属材料及其应用全国重点实验室, 辽宁 鞍山 114009;
    2.鞍钢集团北京研究院有限公司, 北京 102200;
    3.鞍钢股份有限公司, 辽宁 鞍山 114021
  • 收稿日期:2025-02-12 修回日期:2025-06-18 出版日期:2025-08-25 发布日期:2025-09-10
  • 作者简介:刘文月(1980—),男,正高级工程师,博士,主要研究方向为高强韧中厚板材料开发与工艺,E-mail:liuwenyue@ansteel.com.cn

Computational simulation and high-throughput experiment on microstructure and properties of Inconel 625 alloy

Liu Wenyue1,2, Li Tianyi1,2, Gong Li1,2, Ren Yi1,3, Yang Bowei1,2, An Tao1,2   

  1. 1. State Key Laboratory of Metallic Materials for Marine Equipment and Applications, Anshan Liaoning 114009, China;
    2. Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China;
    3. Angang Steel Co., Ltd., Anshan Liaoning 114021, China
  • Received:2025-02-12 Revised:2025-06-18 Online:2025-08-25 Published:2025-09-10

摘要: 基于Thermo-Calc热力学模拟软件、光学显微镜、扫描电镜、能谱仪、拉伸试验机等,对Inconel 625合金进行了组织与性能的模拟计算和高通量试验,研究了Inconel 625合金铸态、轧态及热处理态试样的显微组织、力学性能与耐蚀性。结果表明,Inconel 625合金的铸态显微组织为树枝晶,枝晶间可见Ni3Nb相分布及明显的Mo、Nb成分偏析。铸态、热轧态、调质态及固溶态Inconel 625合金的微观组织基本一致,均为γ基体与Ni3Nb相构成的混合组织,主要区别在于Ni3Nb相的含量。成分偏析对合金的耐蚀性影响显著。经3种轧前热处理方式对比,轧前1250 ℃保温3 h即可获得较好的成分均匀化效果。对比3种轧后热处理方式,调质能获得较好的强度-塑性-耐蚀性的综合匹配。推荐21.5Cr-9Mo-3.65Nb为生产Inconel 625/X65复合板的Inconel 625合金参考成分。

关键词: 镍基合金, Thermo-Calc, 高通量试验, 微观组织, 微观偏析, 耐蚀性

Abstract: Based on Thermo-Calc thermodynamic simulation software, optical microscope, scanning electron microscope, energy dispersive spectrometer, tensile testing machine, etc., the microstructure and properties of the Inconel 625 alloy were simulated and subjected to high-throughput experiment. The microstructure, mechanical properties, and corrosion resistance of the Inconel 625 alloy as-cast, hot rolled, and heat treated specimens were studied. The results indicate that the as-cast microstructure of the Inconel 625 alloy is dendritic, with visible distribution of Ni3Nb phase and significant segregation of Mo and Nb elements between dendrites. The microstructure of the Inconel 625 alloy as-cast, hot rolled, quenched and tempered, and solution treated is basically the same, consisting of a mixed structure of γ matrix and Ni3Nb phase, with the main difference being the content of Ni3Nb phase. The segregation of components has a significant impact on the corrosion resistance of alloy. After comparing three heat treatment methods before hot rolling, it is found that a better homogenization effect can be achieved by holding at 1250 ℃ for 3 h before rolling. Comparing three post rolling heat treatment methods, quenching and tempering can achieve a better comprehensive matching of strength, plasticity, and corrosion resistance. The composition of 21.5Cr-9Mo-3.65Nb is recommended as the Inconel 625 alloy reference composition for producing Inconel 625/X65 composite plate.

Key words: nickel based alloy, Thermo-Calc, high-throughput experiment, microstructure, micro-segregation, corrosion resistance

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