Effect of niobium content on microstructure and mechanical properties of AISI 304N austenitic stainless steel

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-12 DOI:10.1016/j.msea.2025.149103

Fan Wang , Guizhi Xiao , Jiaojiao Ma , Ning Wang , Bo Song , Ye Qiang , Dongsheng Huang , Dening Zou

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引用次数: 0

Abstract

The effects of niobium incorporation on the microstructure and mechanical properties of austenitic stainless steels have been systematically investigated. Microstructural characterization demonstrates that the precipitated phase in 304N austenitic stainless steel is dominated by Cr₂N, while the addition of niobium effectively refines the austenitic grain size, and the uniformly distributed niobium-nitrogen precipitates are an important component of the dislocation pinning effect. Consequently, the niobium microalloyed austenitic stainless steel possesses high yield and tensile strengths, which are significantly better than those of the matrix steel in the experimental results, whereas the elongation to fracture is reduced. Besides, the influence of niobium on the strengthening mechanism of austenitic stainless steels is also discussed from four aspects, i.e., grain strengthening, dislocation strengthening, solid solution strengthening and precipitation strengthening, respectively.

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铌含量对AISI 304N奥氏体不锈钢组织和力学性能的影响

系统地研究了铌对奥氏体不锈钢显微组织和力学性能的影响。显微组织表征表明，304N奥氏体不锈钢的析出相以Cr2N为主，而铌的加入有效细化了奥氏体晶粒尺寸，均匀分布的铌氮析出相是位错钉住效应的重要组成部分。因此，铌微合金化奥氏体不锈钢具有较高的屈服强度和抗拉强度，在实验结果中明显优于基体钢，但断裂伸长率降低。此外，还分别从晶粒强化、位错强化、固溶强化和析出强化四个方面探讨了铌对奥氏体不锈钢强化机理的影响。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.