Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Attar, Hooyar; Ehtemam-Haghighi, Shima; Kent, Damon; Okulov, Ilya; Wendrock, H.; Bönisch, Matthias; Волегов, А. С.; Calin, Mariana; Eckert, J.; Dargusch, Matthew S.

doi:10.1016/j.msea.2017.01.096

Cited by 230 publications

(73 citation statements)

References 62 publications

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“…The wear track of the sample observed by SEM is shown in Figure 7. The wear track of the sample (Figure 7) shows the presence of wear scars along the sliding direction typical for a wear surface and the presence of ploughing grooves and delamination at certain regions similar to that reported in References [39][40][41][42]. The process of coating wear was accompanied by cracking of the coating.…”

Section: Resultssupporting

confidence: 67%

Zircon-Based Ceramic Coatings Formed by a New Multi-Chamber Gas-Dynamic Accelerator

et al. 2017

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Abstract:In this work, dense zircon-based ceramic coatings were obtained from inexpensive zircon powder on a steel substrate by using a new multi-chamber gas-dynamic accelerator. The microstructure and phase composition of the coating were characterized by scanning electron microscopy, optical microscopy, and X-ray diffraction. The mechanical properties of the coatings were evaluated using microindentation, wear tests and bonding strength tests. The results showed that the obtained zircon-based ceramic coatings were continuous without cracks and bonded well with substrate without a sublayer. The zircon-based ceramic coatings consisted of c-ZrO 2 (major phase), m-ZrO 2 and SiO 2 . The zircon-based ceramic coatings had a porosity of 0.1%, hardness of 526 ± 65 HV 0.2 , and a fracture toughness of 2.5 ± 0.6 (MPa·m 1/2 ). The coatings showed the low specific wear rate and average erosion rate. The failure mode occurring in the tested coatings was cohesive.

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Section: Resultssupporting

confidence: 67%

Zircon-Based Ceramic Coatings Formed by a New Multi-Chamber Gas-Dynamic Accelerator

et al. 2017

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“…Also, current advances in biotechnology and biomechanics induce the development of new materials and surface treatments that aim to increase wear and corrosion strength, or improve features, which allows the promotion of the biointegration of materials [4][5][6][7][8]. Laser processing techniques imply the ability to perform changes on surface material without direct contact [9][10][11][12][13]. This feature results in a relatively clean and precise process, due to an excellent control over the heat absorption on the affected area, and the possibility of focusing the laser beam on small areas of the surface.…”

Section: Introductionmentioning

confidence: 99%

Effects of Laser Processing Parameters on Texturized Layer Development and Surface Features of Ti6Al4V Alloy Samples

Salguero

Batista

et al. 2017

Coatings

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Surface engineering is widely used in different areas, such as the aerospace industry or the biomechanical and medical fields. Specifically, laser surface modification techniques may obtain specific surface finishes for special applications. In texturing laser procedures, the control of processing parameters has a great influence on the geometry and characteristics of the treated area. When these processes are carried out on titanium alloys, thin oxide layers are usually developed on the irradiated surface, formed through the thermochemical combination of vaporized material with atmospheric oxygen in the air. In thermal oxidation treatments of Ti6Al4V, the highest concentration of oxides is mainly composed by rutile (TiO 2 ), producing surface property modifications such as hardness, among others. In this research, a thermochemical oxidation of Ti6Al4V alloy has been performed through laser texturing, using laser scanning speed (V s ) and pulse rate (f ) as process control variables, and its influence on the beam absorption capacity of the modified layer have been analyzed. Combined evaluations of microgeometrical features and mechanical properties, such as hardness, verified that, by means of laser texturing treatments, the ability to generate specific topographies and increase the initial hardness of the alloy is obtained. The most advantageous results for the increase of hardness by thermochemical oxidation have been detected in low scan speeds of laser beam treatments, resulting in an increase of approximately 270% using a scanning speed of 10 mm/s. On the other hand, a dependence between roughness values, in terms of R a and R z , and the energy density of pulse (E d ) has been observed, showing higher values of roughness for a 17.68 J/cm 2 energy density of pulse.

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“…In tribological systems, the harder friction partners reveal less wear as the softer friction partners. This relation between the hardness and the wear resistance in materials has been described in various works [15,16]. Ehtemam-Haghighi et al showed that the wear of the investigated material is related to its ability to resist elastic strain to failure, which is described by the ratio H/E (hardness H to elastic modulus E).…”

Section: Variation Of the Zincdialkyldithiophosphate (Zndtp) Concentrmentioning

confidence: 63%

Improving the Tribological Properties of Gear Synchronizations by Adjusting the Metalworking Fluid Composition of the Grinding Process

Seidel

Wagner

Brinksmeier

2017

JMMP

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Abstract:The modification of tribological properties of highly loaded components by selecting a suitable manufacturing process is state-of-the-art. Beyond the generation of microgeometrical structures, the present study investigates the potential of chemical alterations, i.e., metalworking fluid additives engaged in a grinding process to improve the chemical surface properties of machined gear synchronizations. These gearbox components ensure a uniform switching operation by harmonizing the number of revolutions between the power transmitting components by friction. A short running-in phase and a friction coefficient which is constant over the entire duration of use are required. The results show that the addition of polysulfide as well as zincdialkyldithiophosphate in the metalworking fluid could considerably reduce the friction coefficient fluctuations and the running-in phase of the generated synchronizations in later operation tests. The wear distances were lower although the machined parts revealed higher surface roughnesses as the reference workpieces, which indicates the formation of sorption or reaction layers of the additives with the metal surface.

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Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Cited by 230 publications

References 62 publications

Zircon-Based Ceramic Coatings Formed by a New Multi-Chamber Gas-Dynamic Accelerator

Zircon-Based Ceramic Coatings Formed by a New Multi-Chamber Gas-Dynamic Accelerator

Effects of Laser Processing Parameters on Texturized Layer Development and Surface Features of Ti6Al4V Alloy Samples

Improving the Tribological Properties of Gear Synchronizations by Adjusting the Metalworking Fluid Composition of the Grinding Process

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