Abstract:Wear performance as well as the low toughness of CoCrMoSi alloys is associated with the presence of Laves phase. In light of this, alloying elements have been altered in order to reduce the brittleness of newly-cast alloys. This study evaluated coatings by Plasma Transferred Arc (PTA) with different interactions with the AISI 316L substrate. The higher the dilution, it was hypothesized, the higher Iron, Chromium and Nickel contents proceeding from substrate and, therefore, the lower hard Laves phase fraction. … Show more
“…Thus, to promote distinct dilution, coatings were prepared by PTA-P as single beads with four distinct deposition currents: 120, 150, 180 and 200 A. The procedure is in agreement with previous experience and results presented in the literature for such an approach 11,13,24,[26][27][28] . Table 2 shows the main deposition parameters utilized.…”
Section: Methodssupporting
confidence: 79%
“…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: 74%
“…For the coatings deposited with 120 A, the microstructure indicated two different primary phases embedded in an eutectic lamellar: Laves and carbides. Bohatch et al 24 notably found a completely eutectic microstructure for CoCrMoSi (T400) coatings with 18% dilution on AISI 316L…”
Section: Discussionmentioning
confidence: 98%
“…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.…”
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.
“…Thus, to promote distinct dilution, coatings were prepared by PTA-P as single beads with four distinct deposition currents: 120, 150, 180 and 200 A. The procedure is in agreement with previous experience and results presented in the literature for such an approach 11,13,24,[26][27][28] . Table 2 shows the main deposition parameters utilized.…”
Section: Methodssupporting
confidence: 79%
“…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: 74%
“…For the coatings deposited with 120 A, the microstructure indicated two different primary phases embedded in an eutectic lamellar: Laves and carbides. Bohatch et al 24 notably found a completely eutectic microstructure for CoCrMoSi (T400) coatings with 18% dilution on AISI 316L…”
Section: Discussionmentioning
confidence: 98%
“…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.…”
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.
“…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 .…”
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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