Effect of Heat Treatment, Shot Peening and Nitriding Processes on the Pitting Corrosion Resistance of 316 L Stainless Steel Manufactured by Laser Powder Bed Fusion (L-PBF)

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-12-05 DOI:10.1007/s12540-025-02128-x

Wangping Wu, Xingwei Hu, Ao Zhang, Zhizhi Wang, Haijun Pan, Peng Jiang

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Abstract

Degradation of 361 L steel in corrosive solution has been paid attention, especially pitting corrosion. The post-processing technology is an important technique for maintaining relatively favorable mechanical properties to surface properties and corrosion resistance. This study employed laser powder bed fusion (L-PBF) technology to fabricate 316 L stainless steel samples with four different build orientations of 0°, 45°, 60°, and 90°. These samples underwent post-processing, including heat treatment, shot peening (SP), and nitriding. Electrochemical corrosion tests were performed in 3.5 wt% NaCl at 25 °C to evaluate the effects of post-processing on the pitting corrosion of L-PBF 316 L stainless steel. The results indicate that heat treatment, SP, and nitriding post-processing techniques improve the pitting corrosion performance of the samples, with nitriding providing the most significant enhancement. Among the heat-treated samples, those treated at 450 °C exhibited improved corrosion resistance, with the best pitting corrosion resistance observed in the 0° build orientation, with a pitting potential of 0.611 V vs. Ag/AgCl. However, samples subjected to heat treatments at 750 °C and 1050 °C showed decreased corrosion resistance due to the presence of MnS inclusions. For SP-treated samples, the best corrosion performance was observed for the sample printed with the build orientation of 0° and the samples were subjected to SP treatment at 0.2 MPa for 3 min, with a pitting potential of 0.653 V vs. Ag/AgCl. Nevertheless, increasing the intensity or duration of SP treatment resulted in decreased pitting corrosion resistance. The pitting corrosion resistance of nitrided samples increased with the increase in build orientation, with the best resistance observed at a build orientation of 90°, with a pitting potential of 0.766 V vs. Ag/AgCl.

Graphical abstract

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热处理、喷丸强化和渗氮工艺对激光粉末床熔合316l不锈钢抗点蚀性能的影响

361 L钢在腐蚀溶液中的降解问题一直受到人们的关注，尤其是点蚀问题。后处理技术是保持相对良好的机械性能、表面性能和耐腐蚀性的重要技术。本研究采用激光粉末床熔合（L- pbf）技术制备了316l不锈钢样品，构建方向分别为0°、45°、60°和90°。这些样品经过后处理，包括热处理、喷丸强化（SP）和氮化。采用3.5 wt% NaCl在25℃条件下进行电化学腐蚀试验，评价后处理对L- pbf 316l不锈钢点蚀的影响。结果表明，热处理、SP和渗氮后处理技术均能改善样品的点蚀性能，其中渗氮的增强效果最为显著。在热处理样品中，450°C处理的样品具有更好的耐蚀性，在0°构建取向处观察到最佳的点蚀性，点蚀电位为0.611 V vs. Ag/AgCl。然而，经过750°C和1050°C热处理的样品，由于MnS夹杂物的存在，其耐腐蚀性下降。SP处理样品的腐蚀性能最好的是构建取向为0°的样品，在0.2 MPa下进行3 min的SP处理，点蚀电位为0.653 V vs. Ag/AgCl。然而，增加SP处理的强度或持续时间会导致抗点蚀性下降。氮化试样的抗点蚀性随构建取向的增加而增加，其中在90°构建取向时的抗点蚀性最好，点蚀电位为0.766 V vs. Ag/AgCl。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.