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Fatigue Performance of Laser Additive Manufactured Ti–6al–4V in Very High Cycle Fatigue Regime up to 1E9 Cycles
Citation Link: https://doi.org/10.15480/882.1270
Publikationstyp
Journal Article
Date Issued
2015
Sprache
English
Institut
TORE-DOI
Citation
Frontiers in Materials : Structural Materials 2:72
Publisher DOI
Scopus ID
Additive manufacturing technologies are in the process of establishing themselves as
an alternative production technology to conventional manufacturing, such as casting
or milling. Especially laser additive manufacturing (LAM) enables the production of
metallic parts with mechanical properties comparable to conventionally manufactured
components. Due to the high geometrical freedom in LAM, the technology enables
the production of ultra-light weight designs, and therefore gains increasing importance
in aircraft and space industry. The high quality standards of these industries demand
predictability of material properties for static and dynamic load cases. However, fatigue
properties especially in the very high cycle fatigue (VHCF) regime until 109 cycles have
not been sufficiently determined yet. Therefore, this paper presents an analysis of
fatigue properties of laser additive manufactured Ti–6Al–4V under cyclic tension–tension
until 107 cycles and tension–compression load until 109 cycles. For the analysis
of laser additive manufactured titanium alloy Ti–6Al–4V, Woehler fatigue tests under
tension–tension and tension–compression were carried out in the high cycle and VHCF
regime. Specimens in stress-relieved as well as hot-isostatic-pressed conditions were
analyzed regarding crack initiation site, mean stress sensitivity, and overall fatigue performance.
The determined fatigue properties show values in the range of conventionally
manufactured Ti–6Al–4V with particularly good performance for hot-isostatic-pressed
additive-manufactured material. For all conditions, the results show no conventional
fatigue limit but a constant increase in fatigue life with decreasing loads. No effects
of test frequency on life span could be determined. However, independently of testing
principle, a shift of crack initiation from surface to internal initiation could be observed
with increasing cycles to failure.
an alternative production technology to conventional manufacturing, such as casting
or milling. Especially laser additive manufacturing (LAM) enables the production of
metallic parts with mechanical properties comparable to conventionally manufactured
components. Due to the high geometrical freedom in LAM, the technology enables
the production of ultra-light weight designs, and therefore gains increasing importance
in aircraft and space industry. The high quality standards of these industries demand
predictability of material properties for static and dynamic load cases. However, fatigue
properties especially in the very high cycle fatigue (VHCF) regime until 109 cycles have
not been sufficiently determined yet. Therefore, this paper presents an analysis of
fatigue properties of laser additive manufactured Ti–6Al–4V under cyclic tension–tension
until 107 cycles and tension–compression load until 109 cycles. For the analysis
of laser additive manufactured titanium alloy Ti–6Al–4V, Woehler fatigue tests under
tension–tension and tension–compression were carried out in the high cycle and VHCF
regime. Specimens in stress-relieved as well as hot-isostatic-pressed conditions were
analyzed regarding crack initiation site, mean stress sensitivity, and overall fatigue performance.
The determined fatigue properties show values in the range of conventionally
manufactured Ti–6Al–4V with particularly good performance for hot-isostatic-pressed
additive-manufactured material. For all conditions, the results show no conventional
fatigue limit but a constant increase in fatigue life with decreasing loads. No effects
of test frequency on life span could be determined. However, independently of testing
principle, a shift of crack initiation from surface to internal initiation could be observed
with increasing cycles to failure.
Subjects
laser additive manufacturing, very high cycle fatigue, Ti–6Al–4V, selective laser melting, 3D printing, titanium alloy
DDC Class
620: Ingenieurwissenschaften
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