The effect of corrosion on the fatigue crack-growth of 17-4 PH stainless steel specimens made by selective laser melting

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-05-12 DOI:10.1016/j.ijfatigue.2025.109059

America Califano , Enrico Armentani , Filippo Berto , Raffaele Sepe

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引用次数: 0

Abstract

The numerous advantages of the Selective Laser Melting (SLM) technology have made it a quite common Additive Manufacturing (AM) process for components made in metals and metallic alloys. Several factors, like building direction, defects, residual stresses and corrosion can substantially jeopardize the performance of the finished products obtained with such manufacturing process. In this regard, the present study investigates the impact of corrosion on the fatigue crack-growth behavior of 17-4 PH stainless steel specimens manufactured through SLM. This type of stainless steel, known for its high strength and corrosion resistance, is widely used in applications requiring durability under cyclic loading. For this reason, this work explores how the experimental crack initiation and propagation rates are affected by two cross different orientations of the initial notch (horizontal and vertical), different testing environments (air and seawater) and different load frequencies. Findings also highlight how corrosion accelerates fatigue crack growth in SLM-fabricated specimens, indicating a need for tailored post-processing treatments to enhance their performance in corrosive environments.

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腐蚀对选择性激光熔化17-4 PH不锈钢试样疲劳裂纹扩展的影响

选择性激光熔化（SLM）技术的众多优点使其成为金属和金属合金部件的常见增材制造（AM）工艺。有几个因素，如建筑方向、缺陷、残余应力和腐蚀，会严重危害这种制造工艺所获得的成品的性能。在这方面，本研究研究了腐蚀对通过SLM制造的17-4 PH不锈钢试样疲劳裂纹扩展行为的影响。这种类型的不锈钢以其高强度和耐腐蚀性而闻名，广泛用于需要在循环载荷下耐久性的应用中。为此，本工作探讨了两种不同的初始缺口方向（水平和垂直）、不同的试验环境（空气和海水）以及不同的荷载频率对实验裂纹萌生和扩展速率的影响。研究结果还强调了腐蚀如何加速slm制造样品的疲劳裂纹扩展，表明需要定制后处理处理来提高其在腐蚀环境中的性能。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.