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Article
Publication date: 23 August 2022

Germán Omar Barrionuevo, Jorge Andrés Ramos-Grez, Magdalena Walczak, Xavier Sánchez-Sánchez, Carolina Guerra, Alexis Debut and Edison Haro

The effect of processing parameters on the microstructure of steel produced by laser-based powder bed fusion (LPBF) is a recognized opportunity for property design through…

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Abstract

Purpose

The effect of processing parameters on the microstructure of steel produced by laser-based powder bed fusion (LPBF) is a recognized opportunity for property design through microstructure control. Because the LPBF generates a textured microstructure associated with high anisotropy, it is of interest to determine the fabrication plane that would generate the desired property distribution within a component.

Design/methodology/approach

The microstructure of 316 L produced by LPBF was characterized experimentally (optical, scanning electron microscopy, glow discharge emission spectrometry and X-ray diffraction), and a finite element method was used to study the microstructure features of grain diameter, grain orientation and thermal parameters of cooling rate, thermal gradient and molten pool dimensions.

Findings

The computational tool of Ansys Additive was found efficient in reproducing the experimental effect of varying laser power, scanning speed and hatch spacing on the microstructure. In particular, the conditions for obtaining maximum densification and minimum fusion defects were consistent with the experiment, and the features of higher microhardness near the component’s surface and distribution of surface roughness were also reproduced.

Originality/value

To the best of the author’s knowledge, this paper is believed to be the first systematic attempt to use Ansys Additive to investigate the anisotropy of the 316 L SS produced by LPBF.

Details

Rapid Prototyping Journal, vol. 29 no. 3
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 20 March 2017

Gonzalo Reyes Donoso, Magdalena Walczak, Esteban Ramos Moore and Jorge Andres Ramos-Grez

The purpose of this paper is to explore the possibility of producing Cu-based shape memory alloys (SMA) by means of direct metal laser fabrication (DMLF).

441

Abstract

Purpose

The purpose of this paper is to explore the possibility of producing Cu-based shape memory alloys (SMA) by means of direct metal laser fabrication (DMLF).

Design/methodology/approach

The fabrication approach consists of the combination of laser melting of a metallic powder with heating treatment in a controlled inert atmosphere. Three prospective Cu-Al-Ni alloy compositions were tested, and the effects of laser power, as well as laser exposure time, were verified.

Findings

All the processed materials were found to attain microstructures and phase change transformation temperatures typical of this type of SMA.

Practical implications

Further development of this technique will allow for fabrication of large elements with considerable shape memory effect, which are currently not viable due to high cost of nitinol.

Originality/value

This work showed a proof of concept toward the development of DMLF-based additive manufacturing of near net shape components of Cu-based SMAs from elemental powders.

Details

Rapid Prototyping Journal, vol. 23 no. 2
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 10 March 2020

Julia Rey-Pérez and Ana Pereira Roders

The main aim of this paper is to determine how well the UNESCO 2011 Recommendation on Historic Urban Landscape (hereafter, the HUL approach) is understood by the academic…

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Abstract

Purpose

The main aim of this paper is to determine how well the UNESCO 2011 Recommendation on Historic Urban Landscape (hereafter, the HUL approach) is understood by the academic community today. It will review relevant research, highlight shortcomings regarding the HUL concept and approach and explore how well the six proposed steps are being considered when implementing the HUL approach.

Design/methodology/approach

This paper presents and discusses the results of a systematic review of 140 peer-reviewed publications, published in international academic journals between 2008 and 2019 and available in databases such as WoS and Scopus, such as journal articles, book chapters and books. More specifically, this research takes the six-step process as its theoretical framework in order to understand if the six steps are being followed in the case studies where the HUL approach has been implemented. Following this, it assesses gaps in the HUL concept and approach. The paper explores the HUL implementation management process, investigating what is being done, how it is being done and who is involved.

Findings

The concept ‘Historic Urban Landscape’ has been used in research since 2008. However, the first case studies implementing the HUL approach were not published until 2013. While there is an abundance of theoretical research in relation to the HUL concept and approach from different perspectives and to varying degrees of depth, the case studies which practically demonstrate the HUL approach and its six steps are scarce. This paper will also show how feasible the steps are and which are used the most.

Originality/value

This research demonstrates if the HUL approach is being understood in the academic field and if the implementation of the six steps is being reflected in the literature. This approach will reveal how these steps are being implemented and if this is having an effect on the heritage planning process.

Details

Journal of Cultural Heritage Management and Sustainable Development, vol. 10 no. 3
Type: Research Article
ISSN: 2044-1266

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