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微观结构和缺陷在增材制造和峰值时效状态下PBF-LB A357（AlSi7Mg）合金室温及高温拉伸行为中的作用

On the Role of Microstructure and Defects in the Room and High-Temperature Tensile Behavior of the PBF-LB A357 (AlSi7Mg) Alloy in As-Built and Peak-Aged Conditions.

作者信息

Tonelli Lavinia, Liverani Erica, Di Egidio Gianluca, Fortunato Alessandro, Morri Alessandro, Ceschini Lorella

机构信息

Department of Industrial Engineering (DIN), Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy.

出版信息

Materials (Basel). 2023 Mar 29;16(7):2721. doi: 10.3390/ma16072721.

DOI:10.3390/ma16072721
PMID:37049014
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10096135/
Abstract

Additive processes like Laser Beam Powder Bed Fusion (PBF-LB) result in a distinctive microstructure characterized by metastability, supersaturation, and finesse. Post-process heat treatments modify microstructural features and tune mechanical behavior. However, the exposition at high temperatures can induce changes in the microstructure. Therefore, the present work focuses on the analyses of the tensile response at room and high (200 °C) temperature of the A357 (AlSi7Mg0.6) alloy processed by PBF-LB and subjected to tailored T5 (direct aging) and T6R (rapid solution treatment, quenching, and aging) treatments. Along with the effect of microstructural features in the as-built T5 and T6R alloy, the role of typical process-related defects is also considered. In this view, the structural integrity of the alloy is evaluated by a deep analysis of the work-hardening behavior, and quality indexes have been compared. Results show that T5 increases tensile strength at room temperature without compromising ductility. T6R homogenizes the microstructure and enhances the structural integrity by reducing the detrimental effect of defects, resulting in the best trade-off between strength and ductility. At 200 °C, tensile properties are comparable, but if resilience and toughness moduli are considered, as-built and T5 alloys show the best overall mechanical performance.

摘要

诸如激光束粉末床熔融（PBF-LB）之类的增材制造工艺会产生一种独特的微观结构，其特点是具有亚稳性、过饱和度和精细度。后处理热处理会改变微观结构特征并调整力学性能。然而，在高温下暴露会导致微观结构发生变化。因此，本工作重点分析了通过PBF-LB工艺加工并经过定制T5（直接时效）和T6R（快速固溶处理、淬火和时效）处理的A357（AlSi7Mg0.6）合金在室温和高温（200°C）下的拉伸响应。除了分析铸态T5和T6R合金中微观结构特征的影响外，还考虑了典型的与工艺相关缺陷的作用。从这个角度出发，通过对加工硬化行为的深入分析来评估合金的结构完整性，并比较了质量指标。结果表明，T5在不降低延展性的情况下提高了室温下的拉伸强度。T6R使微观结构均匀化，并通过减少缺陷的有害影响来增强结构完整性，从而在强度和延展性之间实现了最佳平衡。在200°C时，拉伸性能相当，但如果考虑弹性模量和韧性模量，铸态和T5合金表现出最佳的整体力学性能。

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本文引用的文献

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