Introduction

Brecher, Christian; Özdemir, Denis

doi:10.1007/978-3-319-12304-2_1

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…These benefits are not possible, or are highly restricted, in conventional metal casting and subsequent thermomechanical processing (TMP) [ 9 , 10 , 11 ]. As a result, the SLM technique is rapidly being incorporated into industrial manufacturing [ 12 , 13 , 14 ], particularly in the aerospace, automotive, biomedical and energy sectors [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Crystallographic Texture and Substructural Phenomena in 316 Stainless Steel Printed by Selective Laser Melting

Santamarı́a

Salasi

Rickard³

et al. 2023

Materials

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There is a fast-growing interest in the use of selective laser melting (SLM) for metal/alloy additive manufacturing. Our current knowledge of SLM-printed 316 stainless steel (SS316) is limited and sometimes appears sporadic, presumably due to the complex interdependent effects of a large number of process variables of the SLM processing. This is reflected in the discrepant findings in the crystallographic textures and microstructures in this investigation compared to those reported in the literature, which also vary among themselves. The as-printed material is macroscopically asymmetric in terms of both structure and crystallographic texture. The <101> and <111> crystallographic directions align parallel with the SLM scanning direction (SD) and build direction (BD), respectively. Likewise, some characteristic low-angle boundary features have been reported to be crystallographic, while this investigation unequivocally proves them to be non-crystallographic, since they always maintain an identical alignment with the SLM laser scanning direction, irrespective of the matrix material’s crystal orientation. There are also 500 ± 200 nm columnar or cellular features, depending on the cross-section, which are generally found all over the sample. These columnar or cellular features are formed with walls made of dense packing of dislocations entangled with Mn-, Si- and O-enriched amorphous inclusions. They remain stable after ASM solution treatments at a temperature of 1050 °C, and therefore, are capable of hindering boundary migration events of recrystallization and grain growth. Thus, the nanoscale structures can be retained at high temperatures. Large 2–4 μm inclusions form during the solution treatment, within which the chemical and phase distribution are heterogeneous.

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Section: Introductionmentioning

confidence: 99%

Crystallographic Texture and Substructural Phenomena in 316 Stainless Steel Printed by Selective Laser Melting

Santamarı́a

Salasi

Rickard³

et al. 2023

Materials

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“…In order to compete in technologically advanced markets, designers have to consider a lot of factors such as strict schedules, budgets, lifecycle concerns, inclusiveness and social impact [5]. Human factors input is ultimately seen as giving products a competitive advantage by helping to develop products in short time periods without compromising the quality level [6] [7]. Usually, the HF/E aspect arrives after the physical mock-up of the product however, with communication difficulties.…”

Section: Introductionmentioning

confidence: 99%

A Mixed Reality Application for Collaborative and Interactive Design Review and Usability Studies

Santhosh

Crescenzio

2022

Advances on Mechanics, Design Engineering and Manufacturing IV

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In recent days product design and review cycles are considerably held to many constraints and requirements. One of the main requirements regards the usability of solutions and the impact that design choices have on final users. Therefore, it is becoming crucial to anticipate human factors concerns in the preliminary phases of product development process. Also, since human factors affect the users subconsciously and influence the decision making in a significant way, they need to be enabled to observe the users while interacting with the product in real-time. In this framework, the platform that the human factors expert and the users use plays a vital role in influencing the human factor assessments and evaluations. Latest developments in Extended Reality opened the way toward the possibility to conceive new simulation platforms that allow experts to deeply explore the products in real-time through collaborative and interactive environments before the physical mockup of the product. The purpose of this paper is to outline a Mixed Reality (MR) tool in the field of aircraft interior design to demonstrate it as a potential co-creative platform for involving human factor experts in the loop while the task is ongoing. An MR multi-user, co-located, collaborative and interactive environment of an aircraft galley is developed where the HF specialist and flight crew member can co-exist to visualize the real scale model of the galley and perform an operational task. Such cocreative tool is foreseen to execute usability tests during design review phase and reduce time, costs of product development cycle while meeting the user requirements.

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“…In particular, this time parameter has been largely neglected and we show here that it plays a significant role in production output. We introduce an indirect reflectance spectroscopy method for monitoring the absorbance behavior of these dynamic, fluid dispersions in realtime, providing a solution amenable to Industry 4.0 [26]. We use this method to extract graphene concentration profiles from the multi-component mixtures (solvent, precursor and 2D material) during exfoliation.…”

Section: Introductionmentioning

confidence: 99%

Real-time monitoring and hydrodynamic scaling of shear exfoliated graphene

et al. 2021

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Shear-assisted liquid exfoliation is a primary candidate for producing defect-free two-dimensional (2D) materials. A range of approaches that delaminate nanosheets from layered precursors in solution have emerged in recent years. Diverse hydrodynamic conditions exist across these methods, and combined with low-throughput, high-cost characterization techniques, strongly contribute to the wide variability in performance and material quality. Nanosheet concentration and production rate are usually correlated against operating parameters unique to each production method, making it difficult to compare, optimize and predict scale-up performance. Here, we reveal the shear exfoliation mechanism from precursor to 2D material and extract the derived hydrodynamic parameters and scaling relationship that are key to nanomaterial output and common to all shear exfoliation processes. Our investigations use conditions created from two different hydrodynamic instabilities-Taylor vortices and interfacial waves-and combine materials characterization, fluid dynamics experiments and numerical simulations. Using graphene as the prototypical 2D material, we find that scaling of concentration of few-layer nanosheets depends on local strain rate distribution, relationship to the critical exfoliation criterion, and precursor residence time. We report a transmission-reflectance method to measure concentration profiles in real-time, using low-cost optoelectronics and without the need to remove the layered precursor material from the dispersion. We show that our high-throughput, in situ approach has broad uses by controlling the number of atomic layers on-the-fly, rapidly optimizing green solvent design to maximize yield, and viewing live production rates. Combining the findings on the hydrodynamics of exfoliation with this monitoring technique, we unlock targeted process intensification, quality control, batch traceability and individually customizable 2D materials on-demand.

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Introduction

Cited by 7 publications

References 12 publications

Crystallographic Texture and Substructural Phenomena in 316 Stainless Steel Printed by Selective Laser Melting

Crystallographic Texture and Substructural Phenomena in 316 Stainless Steel Printed by Selective Laser Melting

A Mixed Reality Application for Collaborative and Interactive Design Review and Usability Studies

Real-time monitoring and hydrodynamic scaling of shear exfoliated graphene

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