scholarly journals Influence of as-built surfaces on the fatigue behavior of AlSi10Mg parts obtained by laser powder bed fusion

2019 ◽  
Vol 24 ◽  
pp. 381-389
Author(s):  
Gianni Nicoletto ◽  
Luigi Gallina ◽  
Enrica Riva
Keyword(s):  
Fatigue Behavior ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals Effect of Surface and Subsurface Defects on Fatigue Behavior of AlSi10Mg Alloy Processed by Laser Powder Bed Fusion (L-PBF)

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1063 ◽  
Author(s):  
Milad Hamidi Nasab ◽  
Alessandro Giussani ◽  
Dario Gastaldi ◽  
Valeria Tirelli ◽  
Maurizio Vedani
Keyword(s):  
Crack Nucleation ◽  
Fatigue Behavior ◽  
Fatigue Behaviour ◽  
Surface Finishing ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Finishing Processes ◽  
Effect Of Surface ◽  
Subsurface Defects

The fatigue behaviour of an AlSi10Mg alloy processed by laser powder bed fusion (L-PBF) and subjected to different surface finishing processes was investigated paying special attention to the residual defects on the surface and the dominant fatigue failure mechanisms. Roughness measurements and qualitative surface morphology analysis showed smooth surfaces in the case of vibro-finishing and machining followed by polishing. The fatigue performance did not reveal to be directly related to surface roughness, but residual intrusions left on the finished surfaces. Post-mortem analysis showed single- or multiple-crack nucleation from pores opened on the surface, un-melted powders, or spatters considered as typical L-PBF defects. A fatigue limit of 195 MPa for machined and polished samples was obtained by substantial removal of surface and subsurface defects.

Tensile and Fatigue Properties of Ti-6Al-4V Alloy Fabricated by Laser Powder-Bed Fusion Process

2020 ◽  
Author(s):  
M. Shafiqur Rahman ◽  
Uttam K. Chakravarty
Keyword(s):  
Fatigue Life ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
Functional Materials ◽  
Fatigue Properties ◽  
Small Scale ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Abstract The tensile and fatigue properties of laser-powder-bed-fusion (L-PBF) processed Ti-6Al-4V specimens are investigated at different loading conditions. Two types of as-built and post-machined L-PBF processed dogbone specimens are considered for the study, one is an ASTME8M round specimen and the other one is a customized small-scale flat structure. The tensile and fatigue behavior of the specimens are investigated numerically using the finite element (FE) method. The FE modeling considers both low cycle fatigue (LCF) and high cycle fatigue (HCF) test conditions by applying cyclic loads in fully-reversed and stress ratio R = 0.1 conditions. The FE results for the von Mises stress, strain, total deformation, fatigue life, factor of safety, and fatigue limit of the Ti-6Al-4V specimens are obtained at room temperature (295 K). Results obtained from the model show that the fatigue life decreases as the load increases. It is also found that fatigue life does not vary with the change of the test frequency under a specific fatigue load. The comparison of mechanical properties of the L-PBF processed specimens with conventionally manufactured Ti-6Al-4V parts is also shown to understand the differences in the tensile and fatigue behavior. The validation of the FE model is performed by comparing the numerical results for the yield stress and fatigue limit with the experimental results found from the literature. The overall study contains a detailed analysis of the tensile and fatigue behavior of additively manufactured Ti-6Al-4V parts and provides a guide to investigating the similar properties for other functional materials used in the L-PBF process.

scholarly journals Influence of surface topography on fatigue behavior of Ti6Al4V alloy by laser powder bed fusion

Procedia CIRP ◽  
2018 ◽  
Vol 74 ◽  
pp. 49-52 ◽  
Author(s):  
A.M. Vilardell ◽  
P. Krakhmalev ◽  
G. Fredriksson ◽  
F. Cabanettes ◽  
A. Sova ◽  
...  
Keyword(s):  
Surface Topography ◽  
Fatigue Behavior ◽  
Ti6al4v Alloy ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Ti-6Al-4V Powder Characteristics in Laser Powder Bed Fusion: The Effect on Tensile and Fatigue Behavior

2021 ◽  
pp. 102584
Author(s):  
Arash Soltani-Tehrani ◽  
Mahdi Habibnejad-Korayem ◽  
Shuai Shao ◽  
Meysam Haghshenas ◽  
Nima Shamsaei
Keyword(s):  
Fatigue Behavior ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Powder Characteristics
Sign in / Sign up

Export Citation Format

Share Document