Laser powder bed fusion of WE43 magnesium alloy porous scaffolds: investigation on densification behavior and dimensional accuracy

2021 ◽  
Author(s):  
Jinge Liu ◽  
Bangzhao Yin ◽  
Peng Wen ◽  
Yun Tian
Keyword(s):  
Magnesium Alloy ◽  
Dimensional Accuracy ◽  
Porous Scaffolds ◽  
Densification Behavior ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
We43 Magnesium Alloy

Hot cracking in ZK60 magnesium alloy produced by laser powder bed fusion process

2021 ◽  
pp. 130283
Author(s):  
Jinge Liu ◽  
Bangzhao Yin ◽  
Zhaorui Sun ◽  
Peng Wen ◽  
Yufeng Zheng ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Hot Cracking ◽  
Fusion Process ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Zk60 Magnesium Alloy

On the manufacturability of Inconel 718 thin-walled honeycomb structures by laser powder bed fusion

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
José M. Zea Pérez ◽  
Jorge Corona-Castuera ◽  
Carlos Poblano-Salas ◽  
John Henao ◽  
Arturo Hernández Hernández
Keyword(s):  
Mechanical Properties ◽  
Inconel 718 ◽  
Dimensional Accuracy ◽  
Honeycomb Lattice ◽  
Lattice Structures ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Content Type ◽  
Powder Bed ◽  
Thin Walled

Purpose The purpose of this paper is to study the effects of printing strategies and processing parameters on wall thickness, microhardness and compression strength of Inconel 718 superalloy thin-walled honeycomb lattice structures manufactured by laser powder bed fusion (L-PBF). Design/methodology/approach Two printing contour strategies were applied for producing thin-walled honeycomb lattice structures in which the laser power, contour path, scanning speed and beam offset were systematically modified. The specimens were analyzed by optical microscopy for dimensional accuracy. Vickers hardness and quasi-static uniaxial compression tests were performed on the specimens with the least difference between the design wall thickness and the as built one to evaluate their mechanical properties and compare them with the counterparts obtained by using standard print strategies. Findings The contour printing strategies and process parameters have a significant influence on reducing the fabrication time of thin-walled honeycomb lattice structures (up to 50%) and can lead to improve the manufacturability and dimensional accuracy. Also, an increase in the young modulus up to 0.8 times and improvement in the energy absorption up to 48% with respect to those produced by following a standard strategy was observed. Originality/value This study showed that printing contour strategies can be used for faster fabrication of thin-walled lattice honeycomb structures with similar mechanical properties than those obtained by using a default printing strategy.

scholarly journals The Dimensional Accuracy of Thin-Walled Parts Manufactured by Laser-Powder Bed Fusion Process

2020 ◽  
Vol 4 (3) ◽  
pp. 91
Author(s):  
Josef Tomas ◽  
Leonhard Hitzler ◽  
Marco Köller ◽  
Jonas von Kobylinski ◽  
Michael Sedlmajer ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Dimensional Accuracy ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Cooling Channels ◽  
Thin Walled ◽  
Scanning Strategies ◽  
Different Diameters ◽  
Functional Components

Laser-Powder Bed Fusion brings new possibilities for the design of parts, e.g., cutter shafts with integrated cooling channels close to the contour. However, there are new challenges to dimensional accuracy in the production of thin-walled components, e.g., heat exchangers. High degrees of dimensional accuracy are necessary for the production of functional components. The aim is to already achieve these during the process, to reduce post-processing costs and time. In this work, thin-walled ring specimens of H13 tool steel are produced and used for the analysis of dimensional accuracy and residual stresses. Two different scanning strategies were evaluated. One is a stripe scan strategy, which was automatically generated and provided by the machine manufacturer, and a (manually designed) sectional scan strategy. The ring segment strategy is designed by manually segmenting the geometry, which results in a longer preparation time. The samples were printed in different diameters and analyzed with respect to the degree of accuracy and residual stresses. The dimensional accuracy of ring specimens could be improved by up to 81% with the introduced sectional strategy compared to the standard approach.

Verzug bei pulverbettbasiertem Schmelzen von TiAl6V4/Distortion in laser beam melting – Influences of part geometry and heat treatment

2021 ◽  
Vol 111 (06) ◽  
pp. 372-377
Author(s):  
Andreas Hofmann ◽  
Alexander Mahr ◽  
Frank Döpper ◽  
Christian Bay
Keyword(s):  
Heat Treatment ◽  
Energy Input ◽  
Dimensional Accuracy ◽  
Temperature Gradients ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Thermally Induced ◽  
Powder Bed ◽  
Part Geometry ◽  
Laser Beam Melting

Der hohe lokale Energieeintrag beim pulverbettbasierten Schmelzen mittels Laserstrahl (laser powder bed fusion, LPBF) bewirkt hohe Temperaturgradienten. Dies führt zu thermisch induzierten Eigenspannungen und Verzug in den gefertigten Bauteilen, wodurch deren Form- und Maßhaltigkeit negativ beeinträchtigt wird. In diesem Beitrag wird der Einfluss der Bauteilgeometrie und einer der Fertigung nachgelagerten Wärmebehandlung auf den Verzug von mittels LPBF gefertigten Bauteilen aus dem Werkstoff TiAl6V4 untersucht.   A high local energy input during laser powder bed fusion (LPBF) creates high temperature gradients. This leads to thermally induced residual stresses and distortion, which negatively affect the dimensional accuracy of components. This paperinvestigates the influence of component geometry and heat treatment after the manufacturing process on the distortion of components made by LPBF of TiAl6V4.

Experimental investigation on the effect of laser powder bed fusion process variables on dimensional accuracy, surface roughness and cylindricity of the AlSi10Mg alloy component

2021 ◽  
pp. 095440892110390
Author(s):  
Nagendra K Maurya ◽  
Ashish K Srivastava ◽  
Ambuj Saxena ◽  
Shashi P Dwivedi ◽  
Mashood Ashraf Ali ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Linear Dimension ◽  
Dimensional Accuracy ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Process Variables ◽  
Connecting Rod ◽  
Powder Bed ◽  
Response Variables

The present study deals with the influence of laser powder bed fusion process parameters on the selected linear dimension, surface roughness and cylindricity of AlSi10Mg alloy for manufacturing of a prototype connecting rod. The process variables used in this investigation are laser power, laser velocity, layer thickness and scanning speed. Response surface methodology is used to perform experiments and data analysis. The levels of process parameters are same that is, five for all the selected input process variables. An automotive component connecting rod is used as a component to analyze the effect of process variables on selected response variables. The optimum sating of process variables are different for dimensional accuracy, surface roughness and cylindricity. Minitab 14 software is used for the data analysis. The international tolerance grades of confirmation experiments are calculated as per the ISO standard UNI EN 20286-I and DIN 16901. A quadratic regression models are developed to estimate the response variables in terms of process parameters. The model is adequate within the experimental domain. X-chart of confirmation experiments is plotted. The deviation in the linear dimension is within the limit of ±3 sigma (σ). The lowest values of response variables at the best level of process parameters are obtained, that is, percentage error in dimensional accuracy of 2.65%, surface roughness of 2.57 µm and cylindricity of 0.09 mm. The novelty of this work lies in the fact that only a few studies have been conducted related to the form errors in the archival literature.

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