Effects of pulse duration and overlapping factor on melting ratio in preplaced pulsed Nd:YAG laser cladding

Farnia, Amirreza; Ghaini, F. Malek; Sabbaghzadeh, J.

doi:10.1016/j.optlaseng.2012.07.015

Cited by 41 publications

(9 citation statements)

References 22 publications

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“…26 The color etchants are reagents that remove a thin layer from the surface of the specimen and simultaneously dissolve it, leaving a thin film on the surface. 20 In the case of aluminum alloys the growth of the film is strongly influenced by the solute micro-segregations. The addition of different solutes can also affect the surface chemical reactions and, therefore, the colors change as a result.…”

Section: Metallographic Analysesmentioning

confidence: 99%

Sensitivity of Weck’s reagent to the microstructure inhomogeneities of a pulse-laser-modified AlSi12CuNiMg alloy

Petrovič¹,

Šturm²

2018

Mater. Tehnol.

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In order to optimize laser cladding using pulsed-laser procedures, in particular to prevent failures of the cladding, a systematic ex-situ characterization can provide a lot of valuable information about the effects of the process parameters on the resulting microstructure and hardness. In this study, a TiC/TiB2 cladded layer was produced by laser scanning over a pre-placed TiC/TiB2/Al powder mixture on an aluminum alloy using a Nd:YAG pulsed laser. The increasing of the EEDV (effective energy density per volume) influences larger scattering of the cladded-layer thickness, whereas the decreasing of the EEDV influences the decrease of its surface roughness. The average hardness of the 0.1-mm-thick layer was 400±10 HV 0.3, which confirmed an improvement in the mechanical properties of the surface. The microstructures were investigated using FE-SEM/EDS and light microscopy. An additional color chemical etching using Weck's reagent at room temperature was performed. Using color etching, the laser-affected features, i.e., the penetration depth, the melt pool, its boundaries and various inhomogeneities, could be clearly distinguished. The sensitivity of the color etchant to the morphological and compositional differences was confirmed by FE-SEM/EDS analyses and microhardness measurements.

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Section: Metallographic Analysesmentioning

confidence: 99%

Sensitivity of Weck’s reagent to the microstructure inhomogeneities of a pulse-laser-modified AlSi12CuNiMg alloy

Petrovič¹,

Šturm²

2018

Mater. Tehnol.

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“…But the decrease in dimension is not in correlation with decrease in EED. Farnia et al [17] showed that the effects of pulse duration and overlapping factor are different at low and high values. When pulse duration increases, the interaction time between laser beam and the material increases which results in a decrease in EED.…”

Section: Microstructurementioning

confidence: 99%

“…It is established that energy density and interaction time are two essential parameters in laser cladding process which affect the clad profile the most [16]. Farnia et al [17] showed that the effects of pulse duration and overlapping factor are different at low and high values, and therefore it is difficult to find optimum values for pulse duration and overlapping factor to achieve maximum efficiency in preplaced pulsed laser cladding process. The selected alloy AlSi12CuNiMg is hypo-eutectic and containing inter-dendritic network of eutectic silicon with different intermetallic compounds which improve alloy micro-hardness.…”

Section: Introductionmentioning

confidence: 99%

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Effect of pulse laser energy density on TiC cladding of aluminium substrate

2015

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Original scientific paper In this work, TiC cladded layer has been produced by laser scanning over the preplaced TiC powder on aluminium substrate, using a pulse Nd:YAG laser. Depending on the effective energy density at the specimen surface, TiC was deposited or partially dispersed into the melted aluminium at the specimen surface. Microstructure was evaluated using optical microscopy and SEM/EDS analysis. Depth of laser cladded layer and microhardness measurements have been deliberated at the cross-section of laser cladded specimens. Effect of pulse laser energy density on cladding layer depth, microhardness, surface roughness and waviness has been studied. From the experimental analysis it is revealed that effective energy density has a significant effect on the TiC cladded surface roughness and waviness, but very little on microhardness of the cladded layer. Keywords: aluminium; cladding; energy density; pulse laser; TiCUčinak gustoće pulzirajuće energije lasera na oblaganje aluminijske podloge TiC-om Izvorni znanstveni članak U ovom je radu sloj obložen TiC-om proizveden skeniranjem laserom preko prethodno položenog praha TiC-a na aluminijsku podlogu pomoću pulzirajućeg Nd:YAG lasera. Ovisno o efektivnoj gustoći energije na površini uzorka, TiC je položen ili djelomično raspršen u rastaljeni aluminij na površini uzorka. Mikrostruktura je određena pomoću optičkog mikroskopa i SEM/EDS analize. Dubina obloženog sloja i mjerenja mikrotvrdoće određena su na poprečnom presjeku uzoraka oblaganih pomoću lasera. Analizirao se učinak gustoće pulzirajuće energije lasera na dubinu oblaganja sloja, mikrotvrdoću, površinsku hrapavost i valovitost. Eksperimentalna analiza je pokazala da efektivna gustoća energije značajno utječe na hrapavost i valovitost površine obložene TiC-om, ali vrlo malo na mikrotvrdoću obloženog sloja.

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“…During investigations modeling of the process of laser surfacing with chromium filler wire of 0.2-0.4 mm diameter of base a of the same material, was performed. Temperature fields were calculated within 3D finite element model, which solved the nonlinear equation of heat conductivity [4][5][6][7]. Nonlinearity of the equation is due to temperature dependence of material thermophysical properties (Figure 4) [8].…”

mentioning

confidence: 99%

Features of chromium filler melting depending on laser radiation pulse shape in welding and surfacing processes

Baevich¹,

Мышковец²,

Maksimenko³

2015

The Paton Welding J.

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Laser technologies are becoming ever wider applied in modern industry in welding and surfacing of metals. Here control of filler material heating and melting, its transfer and formation on the item is important. Laser radiation shapes for filler material melting and transfer with its minimum evaporation have been established with application of mathematical modeling of thermal processes. Pulse front parameters are determined, which ensure minimum energy consumption for heating and melting of chromium filler. Obtained results can be used in development of procedures of pulsed laser welding and surfacing of metals and alloys. 8 Ref., 1 Table, 9 Figures.

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Effects of pulse duration and overlapping factor on melting ratio in preplaced pulsed Nd:YAG laser cladding

Cited by 41 publications

References 22 publications

Sensitivity of Weck’s reagent to the microstructure inhomogeneities of a pulse-laser-modified AlSi12CuNiMg alloy

Sensitivity of Weck’s reagent to the microstructure inhomogeneities of a pulse-laser-modified AlSi12CuNiMg alloy

Effect of pulse laser energy density on TiC cladding of aluminium substrate

Features of chromium filler melting depending on laser radiation pulse shape in welding and surfacing processes

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