Simultaneous Enhancement of Tensile Properties and Hydrogen Embrittlement Resistance in Cu-bearing Austenitic Stainless Steel

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-11-02 DOI:10.1007/s12540-024-01835-1

Hyung-Jun Cho, Yeonggeun Cho, Sung-Joon Kim

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Abstract

Austenitic stainless steels have been utilized in hydrogen (H) facilities for their excellent mechanical properties, corrosion resistance, and resistance to hydrogen embrittlement, but their low yield strength and high alloying costs hinder their competitiveness in steel industries. This study investigated the effects of Cu-rich precipitates on tensile properties and hydrogen embrittlement resistance in Cu-bearing Fe–Cr-Ni-based austenitic stainless steel with varying grain sizes. Tensile properties significantly improved after aging at 700 °C due to the formation of Cu-rich precipitates and subsequent changes in deformation mechanisms. The formation of Cu-rich precipitates decreased solute Cu in the austenite matrix, alleviating the stress localization to improve ductility of the steel. Cu-rich precipitates enhanced hydrogen embrittlement resistance by interfering with the diffusion of H, thereby reducing the amount of desorbed H and preventing H segregation during deformation. The aged specimen subsequently exhibited superior tensile properties and hydrogen embrittlement resistance compared to the annealed specimens, demonstrating the effectiveness of precipitation strategies.

Graphical Abstract

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含铜奥氏体不锈钢抗拉性能和抗氢脆性能的同时增强

奥氏体不锈钢因其优异的机械性能、耐腐蚀性和抗氢脆性而被用于氢(H)设施，但其低屈服强度和高合金化成本阻碍了其在钢铁行业的竞争力。研究了富cu析出物对不同晶粒尺寸含cu fe - cr - ni基奥氏体不锈钢拉伸性能和抗氢脆性能的影响。在700℃时效后，由于富cu析出物的形成和变形机制的改变，拉伸性能显著提高。富Cu析出相的形成降低了奥氏体基体中的溶质Cu，缓解了应力局部化，提高了钢的延展性。富cu析出物通过干扰H的扩散来增强氢的抗脆性，从而减少氢的解吸量，防止变形过程中氢的偏析。与退火试样相比，时效试样随后表现出更好的拉伸性能和抗氢脆性能，证明了沉淀策略的有效性。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.