Effect of Mn replacing Ni on the microstructure and tensile properties of alumina-forming austenitic stainless steel

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Nuclear Materials Pub Date : 2025-03-27 DOI:10.1016/j.jnucmat.2025.155785

Guoshuai Chen , Shang Du , Lingzhi Chen , Weiwei Cong , Zhangjian Zhou

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Abstract

The impact of substituting Mn for Ni on the microstructure and tensile properties of alumina-forming austenitic (AFA) stainless steel was systematically studied. The findings revealed that the addition of 4 wt. % Mn in place of 2 wt. % Ni could inhibit the precipitation of the B2-NiAl phase but increase the aspect ratio of the B2-NiAl particles and promote the precipitation of the Laves phase. The addition of Mn also promoted the formation of coincidence site lattice (CSL) grain boundaries and Goss texture, therefore beneficial for improving the mechanical properties. After aging at 700 °C, the room temperature (RT) ultimate tensile strength (UTS) and elongation of Mn-added AFA steel significantly improved to 1037.5 MPa and 34.53 %, respectively, compared to the Mn-free AFA steel, which exhibited a UTS of 848.35 MPa and elongation of 26.4 %. Notably, when tested at 700 °C, the elongation of Mn-added steel reached 60.5 %, nearly double that of Mn-free steel (36.5 %), while maintaining similar strength.

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Mn取代Ni对成铝奥氏体不锈钢组织和拉伸性能的影响

系统研究了以Mn取代Ni对成铝奥氏体（AFA）不锈钢组织和拉伸性能的影响。结果表明，添加4 wt. % Mn代替2 wt. % Ni可以抑制B2-NiAl相的析出，但会增加B2-NiAl颗粒的长径比，促进Laves相的析出。Mn的加入还促进了符合点阵（CSL）晶界和高斯织构的形成，有利于提高材料的力学性能。经700℃时效处理后，添加mn的AFA钢的室温极限抗拉强度和伸长率分别达到1037.5 MPa和34.53%，而不添加mn的AFA钢的室温极限抗拉强度和伸长率分别为848.35 MPa和26.4%。值得注意的是，在700°C时，添加mn的钢的伸长率达到60.5%，几乎是无mn钢（36.5%）的两倍，而强度保持不变。

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.