Thresholds for high-cycle fatigue in a turbine engine Ti–6Al–4V alloy

Ritchie, Robert O.; Boyce, Brad Lee; Campbell, J.P; Roder, O.; Thompson, A. W.; Milligan, Walter W.

doi:10.1016/s0142-1123(99)00024-9

Cited by 134 publications

(60 citation statements)

References 19 publications

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“…Mercelis & Kruth [8] have investigated this in stainless steel 316, and made several conclusions based on their residual stress testing, particularly in the region nearest the base plate [8]. Components that remained attached to the base plate contained stress levels near to that of the material yield strength, whereas components removed from the base plate had lower stress levels -and yet deformation was present [5]. One way to minimise the degree of temperature gradients (which seem to cause the high residual stresses) is to equip the sintering machine with a heated powder bed that reduces the severity of the temperature gradient around the laser spot [21].…”

Section: Discussionmentioning

confidence: 99%

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Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Knowles

Becker

2012

sajie

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Selective laser melting (SLM) of Ti-6Al-4V has significant potential in the aerospace and biotechnology industries. SLM employs a focused laser beam to melt successive layers of metallic powder into complex components. This process can result in the generation of high thermally-induced residual stresses. These residual stresses, together with micro-flaws/ pores from the inherent fabrication process, may lead to premature fatigue crack initiation and propagation at relatively low cyclic stresses. The hole-drilling strain gauge method was used to evaluate residual stresses within SLM Ti-6Al-4V specimens, with the intention of understanding the associated mechanisms for the successful application of SLM Ti-6Al-4V in industry. OPSOMMING'Selective laser melting' (SLM) van Ti-6Al-4V het aansienlike potentiaal in die lugvaart en biotegnologiese bedrywe. SLM maak gebruik van 'n gekonsentreerde laser straal om agtereenvolgende lae metaal poeier te smelt en sodoende intrieke metal komponente te vorm. Gedurende SLM kan hoë resterende spanning veroorsaak word as gevolg van hoë temperature. Hierdie spanning, asook mikrodefekte wat gedurende die vormingsproses ontstaan, mag lei tot voortydige materiaalverswakking deur spleet vorming en verspreiding gedurende betreklik lae sikliese spannings. Resterende spanning in Ti-6Al-4V eksemplare is bereken deur 'n boor-versonke rekstrokie metode om sodoende die meganismes verantwoordelik vir die suksessvolle toepassing van SLM in die Ti-6Al-4V bedryf te bepaal.

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Section: Discussionmentioning

confidence: 99%

“…This alloy is the most common commercial titanium alloy in production, and has been much used in the biomedical and aerospace industries [5]. Ti-6Al-4V was first developed in 1954 at the Illinois Institute of Technology in the United States of America [6].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Measurements and Structural Integrity Implications for Selective Laser Melted Ti-6al-4v

Knowles

Becker

2012

sajie

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“…Under HCF, loads are typically in the elastic range, and fatigue lives are greater than 10,000 cycles (Grady, 1999). HCF failures occur quickly, due to high frequency loading (Ritchie, 1999).…”

Section: Fatiguementioning

confidence: 99%

“…Microscopic cracks can be initiated by various phenomena, including fretting and foreign object damage (Ritchie, 1999). Sources of loads which can cause HCF include aerodynamic excitation caused by the gas flow through the engine; mechanical vibrations caused by rotor imbalance or by rubbing of components, such as blade tips against the casing; airfoil flutter caused by aeromechanical instability; and acoustics (Cowles, 1996).…”

Section: Fatigue In Aircraft Enginesmentioning

confidence: 99%