Influence of as-built surface on fatigue strength and notch sensitivity of Ti6Al4V alloy produced by DMLS

0509702 - ÚFM 2020 RIV FR eng C - Conference Paper (international conference)
Nicoletto, G. - Konečná, R. - Kunz, Ludvík - Frkan, M.
Influence of as-built surface on fatigue strength and notch sensitivity of Ti6Al4V alloy produced by DMLS.
MATEC Web of Conferences. In: 12TH INTERNATIONAL FATIGUE CONGRESS (FATIGUE 2018). CEDEX: E D P SCIENCES, 2018 - (Henaff, G.), č. článku 02002. MATEC Web of Conferences, 165. ISSN 2261-236X.
[FATIGUE 2018 - International Fatigue Congress /12./. Poitiers Futuroscope (FR), 27.05.2018-01.06.2018]
Institutional support: RVO:68081723
Keywords : behavior * 3D printers * Fatigue of materials * Laser heating
OECD category: Audio engineering, reliability analysis

Direct Metal Laser Sintering (DMLS) is one of the additive manufacturing technologies involving a metal powder bed and a laser source to obtain components of complex geometry. The fatigue life of an as-built DMLS part is negatively influenced by the rough surface compared to a machined surface. Since most DMLS components are expected to have also stress concentrations, here the combined effect on fatigue of a as-built surface and a geometrical notch in as-built DMLS Ti6Al4V was investigated using a new test methodology. Miniature specimens having three different directions with respect to build direction were fabricated and tested determining the directional fatigue notch sensitivity of as-built DMLS Ti6Al4V Optical inspection of notch surface quality and roughness measurements demonstrated a ranking of the directional notches that inversely correlated to the measured fatigue performance. The link among the curved surface orientation, the peculiar layer-wise additive manufacturing fabrication and the fatigue notch sensitivity is clarified.
Permanent Link: http://hdl.handle.net/11104/0301077