Excellent combinations of strength-ductility and corrosion resistance in SAF 2205 duplex stainless steel with multi-scale grain distribution

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-24 DOI:10.1016/j.matchar.2024.114490

Baoyu Luo, Yanhui Guo, Linghuan Pang, Xin Liu, Mingzhe Cui, Bin Fu

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Abstract

In this work, a multi-scale grain structure was obtained in SAF 2205 duplex stainless steel (DSS) by severe deformation and short-term annealing process. The influence of this structure on the mechanical properties and electrochemical behavior is systematically investigated. Experimental results indicate that the sample subjected to short-term annealing at 1000 °C (SA-1000 °C) exhibits the best comprehensive properties, with a yield strength (YS) of 652.6 MPa and an elongation (EL) of 39.9 %. Both strength and ductility surpass those of the original sample and long-term annealed (LA-1000 °C) samples. The strength-ductility product is increased by 32 % compared to the original sample and by 18 % compared to the LA-1000 °C sample. The increase in YS is predominantly attributed to dislocation strengthening and grain refinement strengthening, and the heterogeneous microstructure leads to good ductility. Moreover, the multi-scale distribution of the grain structure exhibits enhanced corrosion resistance due to the increased low-Σ grain boundaries and the promotion of stable passivation film formation by a limited number of defects, thereby mitigating the corrosion rate.

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具有多尺度晶粒分布的 SAF 2205 双相不锈钢具有出色的强度、电导率和耐腐蚀性能组合

在这项研究中，通过剧烈变形和短期退火工艺，在 SAF 2205 双相不锈钢（DSS）中获得了多尺度晶粒结构。系统地研究了这种结构对机械性能和电化学行为的影响。实验结果表明，在 1000 °C（SA-1000 °C）下进行短期退火的样品具有最佳的综合性能，屈服强度（YS）为 652.6 MPa，伸长率（EL）为 39.9 %。强度和延展性都超过了原始样品和长期退火（LA-1000 °C）样品。与原始样品相比，强度-韧性乘积增加了 32%，与 LA-1000 °C 样品相比，强度-韧性乘积增加了 18%。YS 的增加主要归因于位错强化和晶粒细化强化，而异质微观结构则带来了良好的延展性。此外，晶粒结构的多尺度分布增强了耐腐蚀性，这是由于低Σ晶界增加，有限的缺陷促进了稳定钝化膜的形成，从而降低了腐蚀速率。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.