scholarly journals Effects of build orientation on fatigue behavior of Ti-6Al-4V as-built specimens produced by direct metal laser sintering

2019 ◽  
Vol 24 ◽  
pp. 349-359 ◽  
Author(s):  
Giulia Morettini ◽  
Seyed Mohammad Javad Razavi ◽  
Guido Zucca
Keyword(s):  
Fatigue Behavior ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Build Orientation

scholarly journals Sensitivity of direct metal laser sintering Maraging steel fatigue strength to build orientation and allowance for machining

2018 ◽  
Vol 42 (1) ◽  
pp. 374-386 ◽  
Author(s):  
Dario Croccolo ◽  
Massimiliano De Agostinis ◽  
Stefano Fini ◽  
Giorgio Olmi ◽  
Francesco Robusto ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Maraging Steel ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Build Orientation

Influence of the Direct Metal Laser Sintering Process on the Fatigue Behavior of the Ti6Al4V Alloy

2017 ◽  
Vol 891 ◽  
pp. 317-321 ◽  
Author(s):  
Adrián Bača ◽  
Radomila Konečná ◽  
Gianni Nicoletto
Keyword(s):  
Additive Manufacturing ◽  
Process Parameters ◽  
Fatigue Behavior ◽  
Laser Sintering ◽  
Ti6al4v Alloy ◽  
Process Conditions ◽  
Layer By Layer ◽  
Metal Powders ◽  
Direct Metal Laser Sintering ◽  
Post Process

Direct Metal Laser Sintering (DMLS) is additive manufacturing (AM) process that can produce near net shape parts from metal powders such as titanium alloys. DMLS is a layer by layer additive manufacturing technique based on high power fiber laser that creates solid layers from loose powder material and joins them in an additive manner. The specific DMLS process conditions, lead to a specific and complex microstructure and to mechanical properties that show a degree of directionality. It was found that microstructural characteristics are related to the building process parameters. The aim of this work is to evaluate the fatigue performance of the Ti6Al4V alloy depending on the process parameters, building orientations and post-process heat treatment.

Fatigue and Strength Studies of Titanium 6Al–4V Fabricated by Direct Metal Laser Sintering

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Onome Scott-Emuakpor ◽  
Casey Holycross ◽  
Tommy George ◽  
Kevin Knapp ◽  
Joseph Beck
Keyword(s):  
Fatigue Behavior ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Turbine Engine ◽  
Powder Bed ◽  
Bending Fatigue ◽  
Microstructure Characteristics ◽  
Sixth Generation ◽  
Cold Rolled ◽  
Process Controls

Vibratory bending fatigue behavior of titanium 6Al–4V plate specimens manufactured via direct metal laser sintering (DMLS), powder bed fusion additive manufacturing (AM), is assessed. Motivation for the work is based on unprecedented performance demands for sixth-generation gas turbine engine technology that requires complex, lightweight components. Due to cost, schedule, and feasibility limitations associated with conventional manufacturing, AM aims to address ubiquitous component concepts. Though AM has promise in the engine community, process controls necessary for consistent material properties remain an enigma. The following manuscript compares variability of DMLS fatigue and strength to cold-rolled data. Results show discrepancies between DMLS and cold-rolled for fatigue and microstructure characteristics.

High Cycle Fatigue Life of Ti6Al4V Alloy Produced by Direct Metal Laser Sintering

2016 ◽  
Vol 258 ◽  
pp. 522-525 ◽  
Author(s):  
Radomila Konečná ◽  
Gianni Nicoletto ◽  
Adrián Bača ◽  
Ludvík Kunz
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Laser Sintering ◽  
Ti6al4v Alloy ◽  
Cycle Fatigue ◽  
Direct Metal Laser Sintering ◽  
Stress Relieving

High cycle fatigue life of Ti6Al4V alloy specimens manufactured by Direct Metal Laser Sintering (DMLS) was experimentally determined. The DMLS fabrication process was characterized by a 400 W laser power and 50 μm layer melted thickness. Post-fabrication heat treatment consisted in stress relieving for 3 h at 720 °C in vacuum with subsequent cooling in argon atmosphere. Fatigue testing of specimens oriented in three different directions with respect to the material build direction was performed with the aim to examine the influence of the layered microstructure on the fatigue behavior. Results of measurement of surface roughness, metallographic examinations of the layered material and fractographic investigation of the fatigue fracture surfaces were employed in the discussion of fatigue crack initiation in DMLS fabricated Ti6Al4V alloy.

Tensile and Fatigue Behavior of Direct Metal Laser Sintered (DMLS) Inconel 718

2015 ◽  
Author(s):  
Paul F. Kelley ◽  
Anil Saigal ◽  
James K. Vlahakis ◽  
Andrew Carter
Keyword(s):  
Inconel 718 ◽  
Tensile Testing ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Direct Metal Laser Sintering ◽  
Rotating Beam ◽  
Vertical Orientation ◽  
Build Orientation ◽  
End Use

In the rapidly growing field of additive manufacturing (AM), the focus in recent years has shifted from prototyping to manufacturing fully functional, end-use parts, particularly using metals. In order for these parts to be designed to function both safely and effectively, it is necessary to have a thorough understanding of the mechanical behavior of materials produced via the AM process. This research focuses on characterizing Inconel 718 produced via the Direct Metal Laser Sintering (DMLS) process. Specimens from three orthogonal build orientations were tested as both machined and as-fabricated specimens. Surface roughness was evaluated using non-contact profilometry. Tensile testing was performed in order to characterize material yield strength. Finally, high cycle fatigue (HCF) testing was conducted on a rotating beam apparatus. Results show that the measured elastic modulus of the as-fabricated material was 162.7 GPa for the in-plane build orientation and 72.1 GPa for the vertical build orientation. In addition, the measured fatigue strength of horizontal build orientations was greater than that of specimens built in a vertical orientation. Furthermore, it was found that the fatigue lives of the machined specimens were at least 7 times greater than those of as-fabricated specimens.

Metallographic Characterization and Fatigue Damage Initiation in Ti6Al4V Alloy Produced by Direct Metal Laser Sintering

2017 ◽  
Vol 891 ◽  
pp. 311-316 ◽  
Author(s):  
Radomila Konečná ◽  
Gianni Nicoletto ◽  
Adrián Bača ◽  
Ludvík Kunz
Keyword(s):  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Structural Heterogeneity ◽  
Cyclic Stress ◽  
Laser Sintering ◽  
Fatigue Tests ◽  
Ti6al4v Alloy ◽  
Direct Metal Laser Sintering ◽  
Damage Initiation ◽  
Complex Process

Direct Metal Laser Sintering (DMLS) is a complex process where a part is build-up by localized melting of gas atomized powder layers by a concentrated laser beam followed rapid solidification. The microstructure of DMLS produced material is substantially different from that of conventionally manufactured materials, although the ultimate strength is similar. However, yield strength and elongation and especially fatigue behavior may vary considerably according to the process parameters and post fabrication heat treatment because they affect structural heterogeneity, porosity content, residual stresses, and surface conditions. Fatigue tests of DMLS Ti6Al4V alloy are interpreted in the light of a thorough metallographic and fractographic investigation. The fatigue crack initiation for three different cyclic stress directions with respect to build direction is determined by fractography.

Direct Metal Laser Sintering Strategies for Fabrication of Finer Resolution Cellular Structures

2020 ◽  
Author(s):  
Fatemeh Hejripour ◽  
Muhammad Abdus Salam ◽  
Gary L. Bowlin ◽  
Ebrahim Asadi
Keyword(s):  
Laser Sintering ◽  
Cellular Structures ◽  
Direct Metal Laser Sintering
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