TY - JOUR

T1 - Effect of HIP Treatment on Microstructure and Fatigue Strength of Selectively Laser Melted AlSi10Mg

AU - Schneller, Wolfgang

AU - Leitner, Martin

AU - Springer, Sebastian

AU - Grün, Florian

AU - Taschauer, Michael

PY - 2019/2/1

Y1 - 2019/2/1

N2 - This study shows the effect of hot isostatic pressing (HIP) on the porosity and themicrostructure, 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 machinedand exhibit a polished surface. To highlight the effect of the HIP treatment, the HIP specimens arecompared to a test series without any post-treatment. The fatigue characteristic is evaluated bytension-compression high cycle fatigue tests under a load stress ratio of R = 􀀀1. The influence of HIPon the microstructural characteristics is investigated by utilizing scanning electron microscopy ofmicrographs 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 subsequentannealing, 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 significantreduction of global porosity and a decrease of micro pore sizes, to an improved fatigue resistance forthe HIPed condition compared to the other test series within this study.

AB - This study shows the effect of hot isostatic pressing (HIP) on the porosity and themicrostructure, 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 machinedand exhibit a polished surface. To highlight the effect of the HIP treatment, the HIP specimens arecompared to a test series without any post-treatment. The fatigue characteristic is evaluated bytension-compression high cycle fatigue tests under a load stress ratio of R = 􀀀1. The influence of HIPon the microstructural characteristics is investigated by utilizing scanning electron microscopy ofmicrographs 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 subsequentannealing, 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 significantreduction of global porosity and a decrease of micro pore sizes, to an improved fatigue resistance forthe HIPed condition compared to the other test series within this study.

U2 - 10.3390/jmmp3010016

DO - 10.3390/jmmp3010016

M3 - Article

VL - 3.2019

JO - Journal of Manufacturing and Materials Processing

JF - Journal of Manufacturing and Materials Processing

SN - 2504-4494

IS - 1

M1 - 16

ER -