Effect of HIP Treatment on Microstructure and Fatigue Strength of Selectively Laser Melted AlSi10Mg

This study shows the effect of hot isostatic pressing (HIP) on the porosity and the microstructure, as well as the corresponding fatigue strength of selectively-laser-melted (SLM) AlSi10Mg structures. To eliminate the influence of the as-built surface, all specimens are machined and exhibit a polish...

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Bibliographic Details
Published in:Journal of Manufacturing and Materials Processing 2019-03, Vol.3 (1), p.16
Main Authors: Schneller, Wolfgang, Leitner, Martin, Springer, Sebastian, Grün, Florian, Taschauer, Michael
Format: Article
Language:English
Subjects:
additive manufacturing
AlSi10Mg
Annealing
Compression tests
Crack initiation
Crack propagation
Failure analysis
Failure mechanisms
Fatigue failure
Fatigue strength
Fatigue tests
Fracture surfaces
Grain boundaries
Heat
Heat treating
High cycle fatigue
HIP
Hot isostatic pressing
Iron
Laser beam melting
Lasers
Load
Manufacturers
Manufacturing
Microstructure
Photomicrographs
Porosity
Precipitates
SLM
Stress concentration
Stress ratio
Surface analysis (chemical)
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Summary:This study shows the effect of hot isostatic pressing (HIP) on the porosity and the microstructure, as well as the corresponding fatigue strength of selectively-laser-melted (SLM) AlSi10Mg structures. To eliminate the influence of the as-built surface, all specimens are machined and exhibit a polished surface. To highlight the effect of the HIP treatment, the HIP specimens are compared to a test series without any post-treatment. The fatigue characteristic is evaluated by tension-compression high cycle fatigue tests under a load stress ratio of R = −1. The influence of HIP on the microstructural characteristics is investigated by utilizing scanning electron microscopy of micrographs of selected samples. In order to study the failure mechanism and the fatigue crack origin, a fracture surface analysis is carried out. It is found that, due to the HIP process and subsequent annealing, there is a beneficial effect on the microstructure regarding the fatigue crack propagation, such as Fe-rich precipitates and silicon agglomerations. This leads, combined with a significant reduction of global porosity and a decrease of micro pore sizes, to an improved fatigue resistance for the HIPed condition compared to the other test series within this study.
ISSN:2504-4494
2504-4494
DOI:10.3390/jmmp3010016