Microstructure and wear behaviour of laser-cladded γ-Ni_ss/Mo₂Ni₃Si coating

Abstract

A series of γ-Ni ss /Mo 2 Ni 3 Si composite coatings were deposited on the hot-rolled 0.45 wt-% C steel plate using DJ-HL-T5000B CO 2 laser system. The microstructure and phase constitution were studied by XRD and SEM with an attached EDS. Microhardness, toughness and dry sliding wear behaviour of the alloy coating were studied. Research results show that all the designed coatings with different compositions are composed of γ-Ni ss and Mo 2 Ni 3 Si. The volume fraction of Mo 2 Ni 3 Si, as well as the average microhardness, shows an increased tendency as the Ni content decreases from 65% to 50%. The addition of γ-Ni ss ductile phase can effectively improve the toughness of Mo 2 Ni 3 Si-based alloy and prevent the spread of the cracks. Furthermore, the wear resistance of laser-cladded γ-Ni ss /Mo 2 Ni 3 Si coatings exhibits a distinct improvement compared with that of the substrate. The wear mass loss and wear mechanism are affected by the volume fraction of Mo 2 Ni 3 Si.

Ni–WS2–Ti–6Al–4V self-lubricating coating on TC4 alloy by laser cladding

“…This justifies the higher COF and wear resistance property of the cladding sample prepared with 400 mm min −1 laser scanning speed. Moreover, the coating with WS 2 , Ni, and Ti–6Al–4V made a lower COF because of their self-lubrication properties [30].

Figure 9 3D profile of the wear track (a) Sample S1, (b) Sample S2, (c) Sample S3, (d) Substrate.

Figure 10 Wear track profile of the base material and coated samples.

Figure 11 FESEM micrograph of wear track of (a) Sample S1, (b) Sample S2, (c) Sample S3, (d) Substrate.

Figure 12 FESEM micrograph of wear track at high magnification showing wear mechanism for (a) Sample S1, (b) Sample S2, (c) Sample S3, (d) Substrate.

Figure 13 EDS report of the wear track (a) 300 mm min −1 (S1), (b) 400 mm min −1 (S2), (c) 500 mm min −1 (S3), (d) base (Ti6Al4V) .

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“…Figure 12(e-h) shows the magnified FESEM micrograph of the wear tracks showing the mechanism of wear occurred. The primary damage phenomenon for the substrate is the accumulation of wear debris and the formation of small and big craters [30,31]. These aggregated debris results in the destruction of the surface of the parent material.…”

“…This justifies the higher COF and wear resistance property of the cladding sample prepared with 400 mm min −1 laser scanning speed. Moreover, the coating with WS 2 , Ni, and Ti-6Al-4V made a lower COF because of their self-lubrication properties [30].…”

Structure Formation and Tribological Properties of Mo-Si-B-Hf Electrospark Coatings Based on Mo2Ni3Si Laves Phase

“…In 2003-2019, a large amount of research was carried out to study composite materials and coatings containing ternary metal silicide Mo2Ni3Si as the main phase [15][16][17][18][19][20][21][22][23][24][25][26][27]. The interest in these composites is due to the fact that, compared to binary metal silicides, the Mo 2 Ni 3 Si phase has a higher toughness while maintaining high hardness [15][16][17].…”

“…The interest in these composites is due to the fact that, compared to binary metal silicides, the Mo 2 Ni 3 Si phase has a higher toughness while maintaining high hardness [15][16][17]. The tribological behavior of Mo 2 Ni 3 Si-based composites was studied under dry friction conditions [15][16][17][18][20][21][22][23][24][25][26] and in corrosive environments [19]. The samples were tested at room temperature [16,[18][19][20][21][22][23][24][25][26] and at elevated temperatures [15,17].…”