Long fatigue crack growth in Ti6Al4V produced by direct metal laser sintering

0472762 - ÚFM 2017 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Konečná, R. - Kunz, Ludvík - Bača, A. - Nicoletto, G.
Long fatigue crack growth in Ti6Al4V produced by direct metal laser sintering.
XVIII INTERNATIONAL COLLOQUIUM ON MECHANICAL FATIGUE OF METALS (ICMFM XVIII). Amsterdam: Elsevier BV, 2016 - (Pariente, I.; Belzunce, F.; Canteli, A.; Correia, J.; DeJesus, A.), s. 69-76. Procedia Engineering, 160. ISSN 1877-7058.
[ICMFM 2016 - International Colloquium on Mechanical Fatigue of Metals /18./. Gijón (ES), 05.09.2016-07.09.2016]
Institucionální podpora: RVO:68081723
Klíčová slova: DMLS * Ti6Al4V * microstructure * fatigue crack growth
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Results of an experimental determination of the propagation of long fatigue cracks in Ti6Al4V alloy prepared by
selective laser melting technology are presented. Direct metal laser sintering (DMLS) exploiting EOSINT M270
system was used for fabrication of compact tension specimens having different orientation in relation to the build
direction.
It has been found that there is no substantial influence of the build orientation and thus the microstructure exhibiting
directionality on the growth of long fatigue cracks and on the crack propagation threshold, when optimal process
parameters and subsequent stress relieving heat treatments at 380 °C for 8 hours are chosen.
The results were compared with literature data on the growth of long cracks in Ti6Al4V alloy manufactured by
DMLS technique and with data for conventionally produced forged material.
The fatigue crack propagation path, fracture surfaces and fracture surface roughness were investigated. An analysis
of the specific microstructure produced by the direct laser sintering was performed and discussed in terms of the
mechanism of the propagation of long cracks.
Trvalý link: http://hdl.handle.net/11104/0270112