【摘要】 增材制造AlSi10Mg合金在轨道交通领域有着广阔的应用前景，考虑到增材制造AlSi10Mg合金在实际服役过程中会受到腐蚀环境的影响，本工作以增材制造AlSi10Mg为对象，开展材料在5%浓度NaCl盐雾环境中预腐蚀0 h、64 h、136 h、360 h后的微观形貌、力学性能、疲劳性能试验，探究腐蚀对其行为特征的影响。结果表明：随着预腐蚀时间的延长，试样表面出现蚀坑并逐渐扩大，最终连接成片，蚀坑在表面的扩展快于深度方向，且蚀坑扩展在276 h后趋于稳定；试样表面粗糙度随腐蚀时间延长而增大，硬度则有所减小；试样的屈服强度、抗拉强度、弹性模量受腐蚀时间影响较小，而疲劳性能则与腐蚀时间和应力水平两个因素相关，疲劳寿命随着腐蚀时间延长和应力水平增加而下降；预腐蚀时间在低应力水平下对试样疲劳寿命的影响较高应力水平下更显著。断口分析表明，疲劳裂纹萌生于试样近表面的缺陷处，而腐蚀作用加剧了缺陷处的应力集中，促进裂纹萌生。更多还原

【Abstract】 Additive manufacturing(AM) AlSi10Mg alloy demonstrates significant potential in rail transit applications due to its design flexibility and lightweight advantages. Considering that the alloy may be affected by corrosive environments during actual service, this work investigates the effects of pre-corrosion in a 5% NaCl salt spray environment for 0 h, 64 h, 136 h, and 360 h on its microstructure, mechanical properties, and fatigue performance. The results indicate that as the pre-corrosion time increases, pits appear on the surface of the sample and gradually expand, eventually connecting to form larger areas. The pits spread faster along the surface than in depth, and this expansion stabilizes after 276 h. The surface roughness increases with corrosion time, while the hardness decreases. The yield strength, tensile strength, and elastic modulus of the samples are less affected by corrosion time, whereas fatigue performance correlates with both corrosion time and stress level. Fatigue life decreases with increasing corrosion time and stress level. The impact of pre-corrosion time on fatigue life is more pronounced at lower stress levels than at higher ones. Fracture analysis reveals that fatigue cracks initiate at defects near the surface of the samples, and corrosion enhances stress concentration at these defects, promoting crack initiation.更多还原