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Hot dwell-fatigue behaviour of additively manufactured AlSi10Mg alloy: Relaxation, cyclic softening and fracture mechanisms

Article dans une revue avec comité de lecture
Auteur
BAO, Jianguang
407023 University of Nottingham, UK [UON]
411674 Beihang University [BUAA]
WU, Zhengkai
302072 Southwest Jiaotong University [SWJTU]
WU, Shengchuan
302072 Southwest Jiaotong University [SWJTU]
WITHERS, Philip J.
121172 University of Manchester [Manchester]
LI, Fei
407023 University of Nottingham, UK [UON]
AHMED, Saad
121172 University of Manchester [Manchester]
SUN, Wei
407023 University of Nottingham, UK [UON]
ccBENAARBIA, Adil
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/20801
DOI
10.1016/j.ijfatigue.2021.106408
Date
2021
Journal
International Journal of Fatigue

Résumé

This paper presents the results of high temperature strain-range controlled low cycle fatigue tests of a laser powder bead fused AlSi10Mg alloy. Following stress relief (2hrs at 300 ℃), two cyclic loading waveforms (standard triangular and dwell-type trapezoidal waveforms) and three temperatures (100 ℃, 250 ℃ and 400 ℃) were applied to investigate both the mechanical response and the related microstructural changes of this additively manufactured (AM) aluminium alloy. The bulk mechanical responses were found to exhibit a continuous cyclic softening, decreasing stress relaxation and decreased energy dissipated per cycle. The stress relaxation is strongly affected by the test temperature rising to almost complete relaxation at 400 ℃. At lower temperatures (100 ℃ and 250 ℃), the higher the temperature the more subgrains are developed during cyclic loading. Up to 250 ℃, the subgrain size increases with temperature and laser powder bead fused defects pref­erentially act as the fatigue crack initiation sites. While at 400 ℃, coarse Si particles precipitate during cyclic deformation and a high density of microvoids are nucleated from these coarse Si precipitates, which grow and link up to cause failure, resulting in a dimple dominated ductile fracture.

Fichier(s) constituant cette publication

Nom:
LEM3_IJF_2021_BENAARBIA.pdf
Taille:
20.29Mo
Format:
PDF
Fin d'embargo:
2022-04-01
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