Investigation of the Microstructure and Mechanical Characteristics of Lattice Structures Produced by Laser Powder Bed Fusion Method

Ertürk, Alpay Tamer; Bulduk, Mustafa Enes; Tarakçı, Gürkan; Özer, Gökhan; Yarar, Eser

doi:10.1007/s12540-021-01038-y

Cited by 28 publications

(8 citation statements)

References 31 publications

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“…All these objectives are related to thermal performance in the current study; however, if requested by designers, customers, or engineers’ mechanical performance-related objectives like fatigue life or maximum stress can be considered as one of the multiple objectives. For example, Erturk et al [ 25 ] experimentally investigated the mechanical performance of the lattice structures as microstructures. Nevertheless, the use of mechanical performance-related data (e.g., fatigue life) is recommended for constraints of the optimization problem instead of using them as objectives.…”

Section: Outline Of the Entire Processmentioning

confidence: 99%

Metal Additive Manufacturing of Plastic Injection Molds with Conformal Cooling Channels

et al. 2022

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Conformal cooling channels (CCCs) are widely used in the plastic injection molding process to improve the product quality and operational performance. Tooling that incorporates CCCs can be fabricated through metal additive manufacturing (MAM). The present work focuses on the MAM of a plastic injection mold insert with different CCC types that are circular, serpentine, and tapered channels with/without body-centered cubic (BCC) lattices. The entire manufacturing process of the mold insert is explained from the design step to the final printing step including the computational thermal & mechanical simulations, performance assessments, and multiobjective optimization. Compared to the traditional channels, conformal cooling channels achieved up to 62.9% better cooling performance with a better thermal uniformity on the mold surface. The optimum mold geometry is decided using the multiobjective optimization procedure according to the multiple objectives of cooling time, temperature non-uniformity, and pressure drop in the channel. Direct Metal Laser Sintering (DMLS) method is used for manufacturing the molds and the quality of the printed molds are analyzed with the X-ray Computed Tomography (X-ray CT) technique. The errors between the design and the printed parameters are less than 5% for the circular and tapered channels while the maximum deviation of the strut diameters of the BCC is 0.06 mm.

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Section: Outline Of the Entire Processmentioning

confidence: 99%

Metal Additive Manufacturing of Plastic Injection Molds with Conformal Cooling Channels

et al. 2022

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“…The energy source can be a laser, plasma arc, or electron beam. AM is a highly superior technology to traditional methods, especially in producing complex and custom parts [3-8]. Today, metal/AM is widely applied in strategic sectors such as energy, aerospace, defense, automotive, and biomedical [9,10].…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment, Microstructure and Corrosion Relationship on 316L SS Produced by AM

Özer

2023

Materials Science and Technology

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In this study, 316L stainless steel (SS) samples produced with standard parameters using the Additive Manufacturing method were heat treated with different parameters, and the effects of heat treatment on the microstructure, phase changes, hardness, porosity, and corrosion of the material were examined in detail. The results showed that the as-built microstructure of 316L stainless steel material produced by Additive Manufacturing deteriorated as the heat treatment temperature increased and the hardness decreased. The corrosion resistance of the material increased. The best corrosion resistance was obtained from heat treatment at 1150°C for 2 h.

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“…It starts with a 3D model sliced into several layers (2D sections) and material addition is carried out in a layer-by-layer sequence by selective fusion of the preplaced material using high power lasers 15,16 . LPBF provides the additional advantages of reduced tooling, geometric freedom, and mass customization over conventional manufacturing processes (i.e., machining or forming) 17,18 .…”

Section: Introductionmentioning

confidence: 99%

On the hot isostatic pressing of Inconel 625 structures built using laser powder bed fusion at higher layer thickness

Nayak

Jinoop

Paul

et al. 2022

Int J Adv Manuf Technol

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This paper reports the effect of Hot Isostatic Pressing (HIPing) on the porosity, microstructure and mechanical properties of Laser Powder Bed Fusion (LPBF) IN625 structures built at a higher layer thickness of 100 µm. It is observed that the process-induced pores/voids of volume fraction (V f ) 0.43% in as-built IN625 structures are reduced signi cantly to ~ 0.01% after HIPing treatment. The microstructure is changed from ne columnar dendrites to coarse equiaxed dendrites. The microstructural analysis of as-built structures reveals the presence of cellular/ dendritic growth along with elemental segregation of Nb, Si and C and precipitation of Nb-rich carbides. Whereas, coarse recrystallized microstructure along with elemental segregation of Si and precipitation of Nb, Mo and Cr rich carbides are observed in Hot Isostatic Pressed (HIPed) samples. HIPed structures exhibit lower tensile s trength, higher ductility, and lower anisotropy as compared to LPBF built structures. There is a reduction in the Vickers micro-hardness of IN625 samples after HIPing and the values are observed to be similar to their conventional counterparts. Further, an increase in the energy storage capacity of the material is observed after HIPing treatment through Automated Ball Indentation (ABI ® ) studies. The study paves a way to develop ~100% dense, defect-free and isotropic engineering components using LPBF.

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Investigation of the Microstructure and Mechanical Characteristics of Lattice Structures Produced by Laser Powder Bed Fusion Method

Cited by 28 publications

References 31 publications

Metal Additive Manufacturing of Plastic Injection Molds with Conformal Cooling Channels

Metal Additive Manufacturing of Plastic Injection Molds with Conformal Cooling Channels

Heat Treatment, Microstructure and Corrosion Relationship on 316L SS Produced by AM

On the hot isostatic pressing of Inconel 625 structures built using laser powder bed fusion at higher layer thickness

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