Heat treatments effects on Wear performance of Laser based Powder Bed Fusion fabricated Inconel 718 alloy

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2024-07-31 DOI:10.1016/j.wear.2024.205526

Subhendu Naskar , S. Suryakumar , Bharat B. Panigrahi

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引用次数: 0

Abstract

Among the AM processes Laser based Powder Bed Fusion (LPBF) technique offers precise and complex geometric fabrication. However, the microstructural and mechanical properties obtained from LPBF process requires further investigation, especially for IN718 superalloys. In this study, various heat treatments were applied to LPBFed Inconel 718 specimens to examine their effects on microstructure, microhardness and wear behavior. Three different heat treatments, each involving varied solutionizing and ageing steps were incorporated. As-printed specimens exhibited distinct fish scale structures with columnar dendrites. Heat treatments effectively dissolved the Laves phase and precipitated strengthening phases like γ′′ and γ′. Microhardness increased significantly after heat treatments, correlating with the formation of strengthening precipitates. Friction and wear tests showed as-printed specimens exhibited higher wear loss (922 ± 13 μm) and coefficient of friction (COF) (0.511 ± 0.07) due to the presence of Laves phase and softer matrix. Heat-treated specimens demonstrated significantly reduced wear loss (262 ± 5 μm) and COF (0.368 ± 0.01), with HT2 showing the best wear resistance attributed to a homogeneous microstructure. SEM analysis of worn surfaces confirmed abrasive and adhesive wear mechanisms in as-printed specimens, while heat-treated specimens exhibited reduced wear with smoother surfaces.

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热处理对基于激光的粉末床熔铸 Inconel 718 合金磨损性能的影响

在自动机械加工工艺中，激光粉末床熔融（LPBF）技术可提供精确而复杂的几何形状制造。然而，通过 LPBF 工艺获得的微观结构和机械性能还需要进一步研究，特别是对于 IN718 超合金。在这项研究中，对 LPBF 制成的 Inconel 718 试样进行了各种热处理，以考察它们对微观结构、显微硬度和磨损行为的影响。研究采用了三种不同的热处理方法，每种方法都涉及不同的固溶和时效步骤。压印后的试样呈现出明显的鱼鳞状结构，并带有柱状树枝状突起。热处理有效地溶解了 Laves 相，并析出了强化相，如 γ′′ 和 γ′。热处理后，显微硬度明显增加，这与强化析出物的形成有关。摩擦和磨损测试表明，由于存在拉维斯相和更软的基体，未印刷试样表现出更高的磨损损耗（922 ± 13 μm）和摩擦系数（0.511 ± 0.07）。经过热处理的试样明显减少了磨损（262 ± 5 μm）和摩擦系数（0.368 ± 0.01），其中 HT2 的耐磨性最好，这归功于其均匀的微观结构。对磨损表面的 SEM 分析证实了原样印刷试样中的磨料和粘合剂磨损机制，而热处理试样的磨损减少，表面更光滑。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.