Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Inconel 718 Alloy Fabricated by Laser Powder Bed Fusion

Liu, Linqing; Wang, Di; Yang, Yongqiang; Wang, Zhi; Qian, Zeyu; Wu, Shibiao; Tang, Jinrong; Han, Changjun; Tan, Chaolin

doi:10.1002/adem.202200492

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…Grains tended to grow along the direction of heat flow. [ 53 ] When temperature gradient decreased, this growth would be weakened, leading to decreased texture intensity of [001] in IPFs. Other literatures also proved that LPBF could contribute to a strong [001] texture along BD of various alloys with cubic lattice structure.…”

Section: Resultsmentioning

confidence: 99%

Laser Powder Bed Fusion of Cu–Al–Ni–Mn Shape‐Memory Alloy for the Application of Active Heat Sinks: Processability, Microstructures, and Shape‐Memory Effect

Lin,

Tian,

et al. 2023

Adv Eng Mater

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Cu‐based shape memory alloys (Cu‐based SMAs) demonstrate prospects in active heat sinks due to their excellent thermal conductivity, high transformation temperature and low‐cost. However, their inferior mechanical properties have hindered their industrial application. Previous studies have indicated that mechanical properties can be improved by decreasing grain size and minimizing microstructural segregation, which can be achieved by laser powder bed fusion (LPBF) process. This work investigates the influence of process parameters on the processability, microstructure, and shape memory effect (SME) of 81.95Cu‐11.85Al‐3.2Ni‐3Mn (wt. %) thin‐walled samples fabricated by LPBF. Results reveal that laser power and scanning speed significantly affected the relative density of the Cu‐based SMA thin‐walled samples, higher laser power and scanning speed contributed to better processability. Additionally, the high cooling rate during the LPBF process facilitated the formation of β1’ martensite without requiring post‐treatment, and the size of the β1’ martensite decreased with increasing scanning speed. In bending‐recovery experiments, specimens fabricated at higher scanning speed exhibited the highest SME recovery rate and bending angle. Moreover, the test confirms that Cu‐based SMA formed at lower scanning speeds exhibited even higher thermal conductivity. This work shows the potential of fabricating high‐performance Cu‐based SMA components by LPBF.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Laser Powder Bed Fusion of Cu–Al–Ni–Mn Shape‐Memory Alloy for the Application of Active Heat Sinks: Processability, Microstructures, and Shape‐Memory Effect

Lin,

Tian,

et al. 2023

Adv Eng Mater

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“…The scanning strategy is a key factor in determining the thermal history and melt channel combination within a part in a laser powder bed fusion (LPBF) process, which can significantly affect the microstructural evolution, defect formation, and mechanical properties of the part [49].…”

Section: Scanning Strategymentioning

confidence: 99%

Direct Energy Deposition Parametric Simulation Investigation in Gear Repair Applications

et al. 2023

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Additive manufacturing technologies have numerous advantages over conventional technologies; nevertheless, their production process can lead to high residual stresses and distortions in the produced parts. The use of numerical simulation models is presented as a solution to predict the deformations and residual stresses resulting from the printing process. This study aimed to predict the tensions and distortions imposed in the gear repair process by directed energy deposition (DED). First, the case study proposed by National Institute of Standards and Technology (NIST) was analyzed to validate the model and the numerically obtained results. Subsequently, a parametric study of the influence of some of the parameters of DED technology was carried out. The results obtained for the validation of the NIST benchmark bridge model were in agreement with the results obtained experimentally. In turn, the results obtained from the parametric study were almost always in line with what is theoretically expected; however, some results were not very clear and consistent. The results obtained help to clarify the influence of certain printing parameters. The proposed model allowed accounting for the effect of residual stresses in calculating the stresses resulting from gear loading, which are essential data for fatigue analysis. Modeling and simulating a deposition process can be challenging due to several factors, including calibrating the model, managing the computational cost, accounting for boundary conditions, and accurately representing material properties. This paper aimed to carefully address these parameters in two case studies, towards reliable simulations.

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Effect of Composite Scanning Strategy on Forming Quality, Microstructure, and Tensile Properties of Laser Powder Bed Fusion Titanium Alloy

Zhang,

Lin,

Gong

et al. 2024

Adv Eng Mater

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Laser powder bed fusion (LPBF) technology offers significant advantages in manufacturing complex‐shaped titanium alloy components. Traditional scanning strategies, such as zigzag and island scanning, however, often fall short in fabricating parts with variable cross sections. To enhance the forming quality of components featuring combined thin‐walled and bulk structures, a composite scanning strategy is proposed that adapts to the local characteristics of parts. This novel approach is designed to employ both island and zigzag scanning within the same deposition layer, aiming to optimize the balance between porosity and stress distribution. Notably, with a feature transition distance of 4 mm and a scan line offset of 0.67 mm, the specimens achieve a tensile strength of 1311.0 MPa, a yield strength of 1103.0 MPa, and an elongation of 8.8%. This strategy leads to the optimization of defects and a transition in microstructure for combined structural features. These promising outcomes lay the foundation for the intelligent allocation of scanning strategies and the high‐quality formation of complex‐shaped, high‐strength titanium alloy parts.

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Effect of Scanning Strategies on the Microstructure and Mechanical Properties of Inconel 718 Alloy Fabricated by Laser Powder Bed Fusion

Cited by 8 publications

References 49 publications

Laser Powder Bed Fusion of Cu–Al–Ni–Mn Shape‐Memory Alloy for the Application of Active Heat Sinks: Processability, Microstructures, and Shape‐Memory Effect

Laser Powder Bed Fusion of Cu–Al–Ni–Mn Shape‐Memory Alloy for the Application of Active Heat Sinks: Processability, Microstructures, and Shape‐Memory Effect

Direct Energy Deposition Parametric Simulation Investigation in Gear Repair Applications

Effect of Composite Scanning Strategy on Forming Quality, Microstructure, and Tensile Properties of Laser Powder Bed Fusion Titanium Alloy

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