Journal ArticleDOI
Microstructure and loading direction dependent hardening and damage behavior of laser powder bed fusion AlSi10Mg
TLDR
In this article , the authors investigated strain hardening and damage mechanisms with different build platform temperatures (35 °C and 200 °C) and loading directions (horizontal and vertical, building direction being vertical) to probe the effects of microstructure size and melt pool border orientation.Abstract:
The correlation between mechanical behavior and heterogeneous microstructure is still unclear for laser powder bed fusion AlSi10Mg. The present work investigates strain hardening and damage mechanisms with different build platform temperatures (35 °C and 200 °C) and loading directions (horizontal and vertical, building direction being vertical) to probe the effects of microstructure size and melt pool border orientation. The 35 °C microstructure involves load direction independent properties, with ductility determined by damage initiation occurring extremely close to final failure. In contrast, the 200 °C microstructure exhibits anisotropic mechanical behavior, as revealed by higher strain hardening capacity, earlier damage initiation and more dispersed damage distribution for the vertical loading direction. Although the vertical samples generally involve strain localization and crack propagation along the melt pool border, their ductility is not compromised compared to the horizontal counterparts. We attempt to explain these hardening and damage behaviors with stress partition and trade-off between phase stress and strain gradient. read more
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Journal ArticleDOI
Review on the Correlation Between Microstructure and Mechanical Performance for Laser Powder Bed Fusion AlSi10Mg
Lv Zhao,Lu Song,Juan Guillermo Santos Macias,Yaxin Zhu,Minsheng Huang,Aude Simar,Zhenhuan Li +6 more
TL;DR: In this paper , the authors summarize the recent progresses on the characterization of microstructure, assessment of strengthening and damage mechanisms, evaluation of fracture and fatigue resistance, and attempts to build a primary comprehensive link between mechanical performance and micro-structure for the as built state.
Journal ArticleDOI
Multiscale plasticity behavior and fatigue performance of laser melting multi-layer nickel-based superalloys upon heat treatments
Ting-ting Zhang,Huang Yuan +1 more
TL;DR: In this paper , a DIC-aided indentation method was developed to identify the constitutive parameters of the laser melting material by introducing the reference material, and the strengthening mechanisms in the laser-melting material were verified to reveal size-and plasticity-dependent effects.
Journal ArticleDOI
Effects of heat treatments on microstructure and mechanical properties of laser melting multi-layer materials
Ting-ting Zhang,Huang Yuan +1 more
TL;DR: In this paper , the effects of different heat treatments on the microstructure and mechanical properties of the laser melting nickel-based superalloys were systematically investigated, and the results showed consistent stress-strain relationships after the heat treatments, reaching the same level as the heat-treated base material (BM).
Journal ArticleDOI
Microstructural origin of anisotropic tensile ductility of Al-Si alloy manufactured by laser powder bed fusion
TL;DR: In this article , a combination of digital image correlation (DIC) strain analysis and in-situ SEM observations of tensile tests was used to identify microstructural origins in melt-pool (MP) structures contributing to the anisotropic ductility.
Journal ArticleDOI
High-cycle-fatigue properties of selective-laser-melted AlSi10Mg with multiple building directions
Yucheng Zhang,Xiaolong Li,Shihua Yuan,Rui Sun,Tatsuo Sakai,Muhammad Imran Lashari,Usama Hamid,Wei Li +7 more
TL;DR: In this paper , the influence of building angles (0°, 45° and 90°) on high cycle fatigue property of a selective laser melted AlSi10Mg in combination with two-dimensional microscope observation and three-dimensional ultra-depth imaging was investigated.
References
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Journal ArticleDOI
Fine-structured aluminium products with controllable texture by selective laser melting of pre-alloyed AlSi10Mg powder
TL;DR: In this paper, the high thermal gradients occurring during SLM lead to a very fine microstructure with submicron-sized cells, which can be modified to a weak cube texture along the building and scanning directions when a rotation of 90° of the scanning vectors within or between the layers is applied.
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A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties
TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.
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Additive manufactured AlSi10Mg samples using Selective Laser Melting (SLM): Microstructure, high cycle fatigue, and fracture behavior
TL;DR: In this paper, the microstructure, high cycle fatigue (HCF), and fracture behavior of additive manufactured AlSi10Mg samples are investigated, and the results were analyzed statistically by design of experiments, correlation analysis, and marginal means plots.
Journal ArticleDOI
3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting
Nesma T. Aboulkhair,Marco Simonelli,Luke Parry,Ian Ashcroft,Christopher Tuck,Richard J.M. Hague +5 more
TL;DR: A comprehensive understanding of the interrelation between the various aspects of the subject, as this is essential to demonstrate credibility for industrial needs, is presented in this paper, which highlights some key topics requiring attention for further progression.
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Failure of metals I : brittle and ductile fracture
TL;DR: In this paper, the first overview of failure of metals is presented, focusing on brittle and ductile failure under monotonic loadings, where the focus is on linking microstructure, physical mechanisms and overall fracture properties.