Abstract
The high cycle fatigue (HCF) properties of direct metal laser sintering (DMLS) of Ti6Al4V (ELI) in three mutually orthogonal build directions were investigated by cycling specimens under load control, in a tension-tension fatigue testing machine. Semi-log graphs of maximum stress (S) against life (N) of the specimens produced along the respective three build directions were plotted, and the displayed endurance limits compared. Optical and scanning electron microscopy were used to compare and analyse the crack initiation and propagation characteristics of the specimens. The influence of the build direction on the fatigue properties of the tested specimens is discussed here.
Highlights
Work done by the Centre for Rapid Prototyping and Manufacturing (CRPM) of the Central University of Technology Free State on the manufacture of parts using direct metal laser sintering (DMLS) of Ti6Al4V (ELI) powder has far been based on the static mechanical properties of such DMLS parts that have been stress-relieved
This study presents baseline data and analyses on as-built DMLS Ti6Al4V (ELI), as a precursor to studies of DMLS Ti6Al4V (ELI) that is heat treated in order to tailor its microstructure to give the best high cycle fatigue (HCF) properties possible
The fatigue loads of polished (Ra ≈ 0.1 μm) as-built DMLS Ti6Al4V (ELI) specimens built along the X,Y- and Z-build directions and their respective lives were tabulated and presented on a semi-log S
Summary
Author affiliations 1 Department of Mechanical and Mechatronic Engineering, Central University of Technology, Free State, South Africa. The high cycle fatigue (HCF) properties of direct metal laser sintering (DMLS) of Ti6Al4V (ELI) in three mutually orthogonal build directions were investigated by cycling specimens under load control, in a tension-tension fatigue testing machine. Semi-log graphs of maximum stress (S) against life (N) of the specimens produced along the respective three build directions were plotted, and the displayed endurance limits compared. The influence of the build direction on the fatigue properties of the tested specimens is discussed here. Die hoësiklus vermoeidheidseienskappe van direkte metaallaser sintering van Ti6Al4V in drie onderlinge ortogonale bourigtings is ondersoek deur monsters te onderwerp aan beheerde sikliese ladings met behulp vann trek-trek vermoeidheidstoetsmasjien. Die invloed van die bourigting op die vermoeidheidseienskappe van die monsters is bespreek
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