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热处理对选择性激光熔化 Inconel 718 合金组织和力学性能的影响。

Effect of heat treatment on microstructure and mechanical properties of selective laser melted Inconel 718 alloy.

机构信息

School of Automation and Software Engineering, Shanxi University, Taiyuan, China.

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, China.

出版信息

PLoS One. 2024 Sep 5;19(9):e0309156. doi: 10.1371/journal.pone.0309156. eCollection 2024.

Abstract

In this study, we conducted two heat treatment processes, namely double aging (DA) and solid solution followed by double aging (SA), on the Inconel 718 alloy fabricated by selective laser melting (SLM). The aim was to investigate the microstructure evolution and mechanical properties of Inconel 718 under different heat treatment conditions. To achieve this, we employed advanced techniques such as Scanning Electron Microscope (SEM), electron backscattered diffraction (EBSD), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD), Tofwerk time-of-flight secondary ion mass spectrometer (TOF-SIMS), and transmission electron microscopy (TEM). Our experimental findings reveal the presence of cellular high-density dislocation substructures in the as-received (AR) specimens, with a significant accumulation of Laves phase precipitates at grain boundaries and subgrain boundaries. After the DA treatment, the cellular substructure persists, with higher concentrations of γ" and γ' strengthened phases compared to AR specimen. Conversely, the SA specimen undergoes almost complete recrystallization, resulting in the dissolution of brittle Laves phases and a substantial increase in the content of strengthening phase γ'' and γ'. As a consequence of the precipitation of the γ'' and γ' strengthened phase and the modification of the microstructure, the material exhibits enhanced strength and hardness, albeit at the expense of reduced plasticity. The investigation of the relationship between heat treatment processes and precipitation behavior indicates that the SA heat treatment yields favorable mechanical properties that strike a balance between strength and plasticity.

摘要

在这项研究中,我们对通过选择性激光熔化 (SLM) 制造的 Inconel 718 合金进行了两种热处理工艺,即双时效 (DA) 和固溶后双时效 (SA)。目的是研究不同热处理条件下 Inconel 718 的微观结构演变和力学性能。为此,我们采用了扫描电子显微镜 (SEM)、电子背散射衍射 (EBSD)、能谱分析 (EDS)、X 射线衍射 (XRD)、Tofwerk 飞行时间二次离子质谱仪 (TOF-SIMS) 和透射电子显微镜 (TEM) 等先进技术。我们的实验结果表明,在原始状态 (AR) 样品中存在细胞状高密度位错亚结构,并且在晶界和亚晶界处存在大量 Laves 相析出物的聚集。经过 DA 处理后,细胞亚结构仍然存在,与 AR 样品相比,γ"和γ'强化相的浓度更高。相比之下,SA 样品经历了几乎完全的再结晶,导致脆性 Laves 相溶解,强化相 γ''和 γ'的含量大幅增加。由于 γ''和 γ'强化相的析出和微观结构的改变,材料表现出增强的强度和硬度,尽管牺牲了一定的塑性。对热处理工艺与析出行为之间的关系进行研究表明,SA 热处理可以获得在强度和塑性之间取得平衡的有利力学性能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/151e/11376572/33577e51b239/pone.0309156.g001.jpg

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