Study of Interface-Related Mechanisms in the Early Stage Precipitation of σ Phase in Hyper Duplex Stainless Steels

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL Journal of Phase Equilibria and Diffusion Pub Date : 2023-12-19 DOI:10.1007/s11669-023-01080-w

Aurélie Jacob, Roman Schuster, Laszlo Solyom, Andreas Keplinger, Erwin Povoden-Karadeniz

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Abstract

This work aims to computationally explore the diffuse prerequisites for σ phase precipitation in high-alloyed duplex steels. The diffusion control for the early precipitation stage of the σ phase was studied by the Calphad thermodynamic modeling combined with the DICTRA software. Different nucleation sites, α/γ, and α/α and γ/γ grain-boundaries, were studied using thermodynamic and mobility databases developed by the present authors in previous works for high-alloyed duplex stainless steel. Simulation results were compared to experimentally obtained microstructures of aged samples. The study of the concentration profiles of the elements Cr, Mo, and Ni revealed that the precipitation is most favorable within the α phase due to fast mobility and strong thermodynamic driving force favoring the formation of the σ phase. Based on the present results, the role of the different heterogeneous sites for the precipitation of the σ phase in hyper duplex steel is discussed.

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超双相不锈钢中σ相早期沉淀的界面相关机制研究

这项工作旨在通过计算探索高合金双相钢中σ相析出的扩散先决条件。Calphad 热力学模型与 DICTRA 软件相结合，对 σ 相早期析出阶段的扩散控制进行了研究。利用作者在以前的工作中为高合金双相不锈钢开发的热力学和迁移率数据库，研究了不同的成核点 α/γ、α/α 和 γ/γ 晶界。模拟结果与实验获得的老化样品微观结构进行了比较。对铬、钼和镍元素浓度曲线的研究表明，由于流动性快，热力学驱动力强，有利于σ相的形成，因此在α相内析出最为有利。根据本研究结果，讨论了超双相钢中不同异质位点对 σ 相析出的作用。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.