Tensile Properties and Microstructure of Direct Metal Laser-Sintered Ti6al4v (Eli) Alloy

Moletsane, Morakane Gloria; Krakhmalev, Pavel; Kazantseva, N. V.; Plessis, Anton du; Yadroitsava, Ina; Yadroitsev, Igor

doi:10.7166/27-3-1667

Cited by 22 publications

(18 citation statements)

References 16 publications

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“…These static mechanical properties were found to conform to the properties of standard wrought Ti6Al4V (ELI) [1,2]. However, for DMLS Ti6Al4V (ELI) parts that are expected to experience cyclic loading, there is uncertainty that they will last their full operational life.…”

Section: Introductionmentioning

confidence: 99%

“…Thus their major axis is always horizontal, which brings about anisotropy between horizontally and vertically built SLM parts. Work carried out in CRPM shows SLM Ti6Al4V (ELI) parts to have a porosity of about 0.0022 per cent [1]. This high densification minimises the possibility of fatigue cracks initiating from pores.…”

Section: Sources Of Fatigue Failure In As-built Dmls Of Ti6al4v (Eli)mentioning

confidence: 99%

“…The maximum stress ( ) loading regime from which the semi-log S-N curves were drawn was set between 675 MPa and 360 MPa in each set of specimens built in each one of the three mutually orthogonal DMLS build directions. The first test specimen in each set of specimens was tested at 675 MPa, which is 60 per cent of the as-built DMLS Ti6Al4V (ELI) yield strength [1]. This is a stress level at which failure was expected to occur after a fairly short number of cycles [13].…”

Section: Tension-tension Fatigue Testingmentioning

confidence: 99%

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High Cycle Fatigue Properties of as-Built Ti6al4v (Eli) Produced by Direct Metal Laser Sintering

Malefane

Preez

Maringa

2017

SAJIE

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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. OPSOMMINGDie 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 van ŉ trek-trek vermoeidheidstoetsmasjien. Semi-log grafieke van maksimum spanning teen leeftyd (S-N grafieke) is vir die monsters saamgestel, saam met die onderskeie bou rigtings. Sodoende kon die vermoeidheidslewe vergelyk word. Optiese-en skandeer elektronmikroskopie is gebruik om die kraakvorming en -voortplanting te vergelyk en te analiseer. Die invloed van die bourigting op die vermoeidheidseienskappe van die monsters is bespreek. INTRODUCTIONWork 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 thus far been based on the static mechanical properties of such DMLS parts that have been stress-relieved. These static mechanical properties were found to conform to the properties of standard wrought Ti6Al4V (ELI) [1,2]. However, for DMLS Ti6Al4V (ELI) parts that are expected to experience cyclic loading, there is uncertainty that they will last their full operational life. This is due to limited available fatigue life data for the DMLS-produced alloy.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.

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Section: Introductionmentioning

confidence: 99%

Section: Sources Of Fatigue Failure In As-built Dmls Of Ti6al4v (Eli)mentioning

confidence: 99%

Section: Tension-tension Fatigue Testingmentioning

confidence: 99%

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High Cycle Fatigue Properties of as-Built Ti6al4v (Eli) Produced by Direct Metal Laser Sintering

Malefane

Preez

Maringa

2017

SAJIE

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“…Porosity in DMLS Ti6Al4V (ELI) arises from gas entrapments within a part during the powder melting that are characterised by small spherical geometries [2]. It also arises from the lack of fusion of the powder as a result of un-melted or semi-melted powder [2,3]. The lack of fusion pores is bigger than the gas entrapment pores, which are oval shaped and located between two consecutive layers formed during the DMLS process [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…It also arises from the lack of fusion of the powder as a result of un-melted or semi-melted powder [2,3]. The lack of fusion pores is bigger than the gas entrapment pores, which are oval shaped and located between two consecutive layers formed during the DMLS process [3,4]. These pores, inherent in the DMLS specimens, act as stress concentration sites, and are expected to lower the tensile and fatigue properties of the specimens and determine the locations of the fracture planes in the specimens [5,6].…”

Section: Introductionmentioning

confidence: 99%

Tensile and High Cycle Fatigue Properties of Annealed Ti6al4v (Eli) Specimens Produced by Direct Metal Laser Sintering

Malefane

Preez

Maringa

et al. 2018

SAJIE

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The tensile and high cycle fatigue (HCF) properties of high temperature annealed (HTA) direct metal laser sintered (DMLS) Ti6Al4V extra low interstitial (ELI) machined and polished specimens were investigated. The HTA heat treatment of the specimens resulted in the nucleation and growth of the alpha and beta grains from the acicular ′ martensite grains, improving their elongation to failure. The specimens were micro-CT scanned in an attempt to relate the pores in the specimens to their fatigue properties. The micro-CT pore information from suspected crack initiation pores on the surfaces of eventual fracture was used to calculate the stress intensity factors, which correlated well with the decreasing cycles to failure of the fatigue test specimens for all three build directions. Three representative specimens were analysed, and the 'killer pore' was identified in each micro-CT scan and fractograph, all of which were proximal to the surface of the specimen.

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On the anisotropy in room-temperature mechanical properties of laser powder bed fusion processed Ti6Al4V-ELI alloy for aerospace applications

et al. 2022

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Tensile Properties and Microstructure of Direct Metal Laser-Sintered Ti6al4v (Eli) Alloy

Cited by 22 publications

References 16 publications

High Cycle Fatigue Properties of as-Built Ti6al4v (Eli) Produced by Direct Metal Laser Sintering

High Cycle Fatigue Properties of as-Built Ti6al4v (Eli) Produced by Direct Metal Laser Sintering

Tensile and High Cycle Fatigue Properties of Annealed Ti6al4v (Eli) Specimens Produced by Direct Metal Laser Sintering

On the anisotropy in room-temperature mechanical properties of laser powder bed fusion processed Ti6Al4V-ELI alloy for aerospace applications

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