Surface modification of superduplex stainless steel with C and N: Microstructural and nanomechanical insights

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-10-09 DOI:10.1016/j.surfcoat.2024.131441

Alisiya Biserova-Tahchieva , Laia Ortiz-Membrado , Raúl Benítez , Oriol Rius-Ayra , Núria Llorca-Isern , Antonio Mateo , Emilio Jiménez-Piqué

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Abstract

In this study, the effect of thermochemical processes, such as nitriding and carburizing, on the microstructural evolution of superdúplex stainless steel is presented. The objective is to find a correlation between the microstructure and the mechanical properties of the constitutive phases of this stainless steel (i.e., austenite and ferrite) and analyze the diffusion elements influence on the precipitation of secondary phases, such as sigma (σ), chi (χ), nitrides, and carbides. Hardness (H) and elastic modulus (E) maps were obtained by using a high-speed nanoindentation technique. H and E values for the individual phases were determined through the application of Gaussian Mixture Model statistical analysis. Assessments of the mechanical properties of the different phases were achieved by overlaying field emission-scanning electron microscopy micrographs. An excellent correlation between microstructure and small-scale mechanical properties was attained. Secondary phases have been detected and nanoindentation statistics have proven their influence on the mechanical properties.

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用 C 和 N 对超级双相不锈钢进行表面改性：微观结构和纳米力学的启示

本研究介绍了氮化和渗碳等热化学过程对超孪晶不锈钢微观结构演变的影响。目的是找到该不锈钢的微观结构与构成相（即奥氏体和铁素体）机械性能之间的相关性，并分析扩散元素对次级相（如 sigma (σ), chi (χ), 氮化物和碳化物）析出的影响。使用高速纳米压痕技术获得了硬度（H）和弹性模量（E）图。通过应用高斯混合模型统计分析确定了各相的 H 值和 E 值。通过叠加场发射扫描电子显微镜显微照片，对不同相的机械性能进行了评估。微观结构与小尺度机械性能之间实现了良好的相关性。检测到了次生相，纳米压痕统计证明了它们对机械性能的影响。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.