Effect of Track Overlap on the Microstructure and Properties of the CoCrMoSi PTA Coatings

Bohatch, Rafael Guetter; Graf, Karin; Scheid, Adriano

doi:10.1590/1516-1439.340014

Cited by 9 publications

(8 citation statements)

References 12 publications

(26 reference statements)

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“…6 and 7). Opposed to what has been previously observed regarding the effect of dilution with iron-base alloy substrates on the T400 alloy, in which a decrease in hardness was found [24][25][26] , the processing on highcarbon cast iron was able to maintain or even increase the high coatings hardness. From the nanoindentation tests, it can be noticed that labyrinth-like eutectics (120 and 150 A) presented a slight hardness increase from 7.1 and 7.7 GPa, respectively.…”

Section: Discussioncontrasting

confidence: 71%

“…the high values observed can be attributed to the cast iron substrate. Bohatch et al 25 evaluated the CoCrMoSi T400 alloy by PTA on AISI 316 L stainless steel and, despite the lower thermal conductivity of this substrate, lower dilution was obtained for the same deposition current intensities. Thus, an interesting finding concerning the influence of the substrate on dilution is that, since similar thickness and heat input was adopted, the differences in dilution can be associated with the chosen substrate melting point.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have being carried out to improve corrosion and wear resistance selecting Ni-based alloys, [17][18][19][20] , TiC-W-Cr alloying 21 [23][24][25] , there is an evident gap concerning the effect of processing CoCrMoSi alloys coatings on Fe-C-Si alloy substrates. Hence, the aim of this investigation is to evaluate the effect of simultaneous introduction of iron, carbon and silicon (due to welding dilution) on the microstructure and properties of the Co base T400 alloy coatings processed by PTA on highcarbon content GGG40 ductile Iron.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

et al. 2018

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The Laves phase reinforced CoCrMoSi alloy system has emerged as a candidate material to protect the surface of components to withstand harsh environments under wear and/or corrosion. However, previous reports have raised some concerns and restricted a wider selection of iron-based substrates to be coated, especially limiting the carbon content. This work aims to outline the Laves -Carbides phases in the microstructure and its effect on the properties of T400 alloy deposited on GGG40 ductile iron. Dilution of 26 % ensured Laves formation either as primary or secondary, due to high-silicon substrate selected. Departing from 41 % dilution, the alloy changed to a completely carbide strengthened system. Therefore, for the lowest dilution the coatings hardness is dictated by Laves phase whereas, for higher ones, carbides are the most influent phases.

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Section: Discussioncontrasting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

et al. 2018

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“…Moreover, the hardfacing of steel substrates has been considered for their attractive properties and relatively low cost. In fact, dilution should be kept as low as possible, since higher dilution induces a decrease in hardness often associated with microstructure changes, that is, a lower fraction of strengthening carbides and lower alloying in the Co-SS 8,[11][12][13][14][15] . Halstead and Rawlings 16 have investigated the effect of iron additions on Co-based alloys microstructure, and many recent welding papers 8,12,14,15 have confirmed a larger fraction of Co-rich solid solution phase as higher dilution in the steel substrate is achieved 8 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Bead Overlapping on the Microstructure and Mechanical Properties of CoCrWC Alloy Coatings

et al. 2018

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In order to protect industrial components, cobalt base alloys are applied as hardfacing material through welding techniques. A large number of papers have shown that controlling the chemical composition is a key point regarding the wear and corrosion resistance of coatings. This paper investigated the effect of bead overlapping on the microstructure and properties of CoCrWC alloy coatings. Mechanical properties were determined by hardness, sliding wear and microtensile tests. Bead overlapping reduces dilution during the previous bead melting, which in turn induces lower iron content. From the second bead on, an increase in the amount of interdendritic carbides and solid solution alloying was verified, accounting for the higher mechanical properties of the coatings.

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“…Plenty of the scientific authors proved nowadays theoretical and practical possibility of modulation of the laser beam from laser beam mode TEM00 to alternative ones for technical and technological uses [11][12][13][14][15][16][17][18]. The current research aim of the study it is pointed to the problem of reducing of the influence of the described negative effects on the quality of the final 3D-object, obtained by SLM, and to the search of the possible improvement the processing efficiency.…”

Section: Introductionmentioning

confidence: 99%

Study of layers’ structure defects of 3D objects obtained by selective laser melting

Gurin¹,

Tyurbeeva²,

Peretyagin³

et al. 2016

Mechanics & Industry

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-Current work was aimed to study of layers' structure defects of 3D-objects obtained by selective laser melting with the modulated laser beam mode. Traditionally Gaussian laser beam mode uses for the processing in selective laser melting. On the developed experimental setup, the alternative laser beam modes as Flat-top and Inverse Gaussian were obtained. With the carried out experiments 3D-objects contained 10 layers were produced from CoCrMo powder with the diameter of granules less than 20 µm. The layers' structure defects as penetration of the substrate material into the body of produced objects were studied by optical and scanning electronic microscopy. Key words:Selective laser melting / 3D-object / laser beam mode / laser beam power density distribution / CoCrMo powder / structure defects / SEM

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Effect of Track Overlap on the Microstructure and Properties of the CoCrMoSi PTA Coatings

Cited by 9 publications

References 12 publications

Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

Effect of Bead Overlapping on the Microstructure and Mechanical Properties of CoCrWC Alloy Coatings

Study of layers’ structure defects of 3D objects obtained by selective laser melting

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