Selective Laser Re-Melting
type: CreativeWork
description: The additive manufacturing (AM) industry is heavily employed in a wide variety of applications today. Initially, the different processes have been used for concept modelling and rapid prototyping but are now capable of building fully functional parts. Selective laser melting (SLM) is one of the rapidly growing technologies since its inception in early 2000s. It creates parts by melting powder materials in layers using a laser heat source based on the information provided by a three-dimensional computer-aided design model. The parameters of SLM have been continuously optimised while attempting to produce fully dense parts comparable to the traditionally counterparts. This is an ongoing area of research due to the considerable number of variables involved in the process, including but not limited to powder material properties (powder deposition, particle morphology, particle size, particle size distribution and particle porosity), laser parameters (laser power, laser scan speed and laser scan spacing), and build chamber conditions (atmosphere, powder bed temperature and substrate plate preheating). Selective laser re-melting (SLR) is yet another approach visualised for improving the quality of SLM parts by integrating the laser surface re-melting (LSR) schemes into the SLM process planning. By re-melting every layer of a part, improved mechanical and physical properties can be obtained through decreased porosities. The re-melting process promotes grain refinement with a larger temperature gradient and balling within solidified layers is reduced leading to the reduction of pores and defects. However, the SLR technique further complicates the small SLM process window and requires careful selection of parameters for a successful build. Additionally, past SLR experiments employed laser powers less than 100 W as were made available with the older SLM machines. This study explores the effects of laser re-melting in SLM with varying energy density settings, establishing the …
abstract: The additive manufacturing (AM) industry is heavily employed in a wide variety of applications today. Initially, the different processes have been used for concept modelling and rapid prototyping but are now capable of building fully functional parts. Selective laser melting (SLM) is one of the rapidly growing technologies since its inception in early 2000s. It creates parts by melting powder materials in layers using a laser heat source based on the information provided by a three-dimensional computer-aided design model. The parameters of SLM have been continuously optimised while attempting to produce fully dense parts comparable to the traditionally counterparts. This is an ongoing area of research due to the considerable number of variables involved in the process, including but not limited to powder material properties (powder deposition, particle morphology, particle size, particle size distribution and particle porosity), laser parameters (laser power, laser scan speed and laser scan spacing), and build chamber conditions (atmosphere, powder bed temperature and substrate plate preheating). Selective laser re-melting (SLR) is yet another approach visualised for improving the quality of SLM parts by integrating the laser surface re-melting (LSR) schemes into the SLM process planning. By re-melting every layer of a part, improved mechanical and physical properties can be obtained through decreased porosities. The re-melting process promotes grain refinement with a larger temperature gradient and balling within solidified layers is reduced leading to the reduction of pores and defects. However, the SLR technique further complicates the small SLM process window and requires careful selection of parameters for a successful build. Additionally, past SLR experiments employed laser powers less than 100 W as were made available with the older SLM machines. This study explores the effects of laser re-melting in SLM with varying energy density settings, establishing the …
author: Chung, Sonia
keywords: Additive manufacturing, Selective laser melting, 316L stainless steel, 3D printing, Metal AM, Selective laser re-melting
date published: 2017
date modified: 2026-07-27T18:45:44Z
provider: AUT University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: AUT University