Effects of annealing on laser clad Ti2SC/CrS self-lubricating anti-wear composite coatings on Ti6Al4V alloy: Microstructure and tribology

Lu, Xiaoqing; Liu, Xiubo; Yu, Peng-Cheng; Fu, Geyan; Zhu, Guangtian; Wang, Y.; Chen, Yao

doi:10.1016/j.triboint.2016.05.004

Cited by 52 publications

(19 citation statements)

References 32 publications

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“…Compared with the XRD data of CrS in Ref. [ 19 ] and NbC in Ref. [ 23 ], it can be deduced that coating 4, coating 5, and coating 6 mainly consists of γ-Co, CoC x , Cr 23 C 6 , CrS, and NbC.…”

Section: Resultsmentioning

confidence: 96%

“…However, no WS 2 phase can be found in XRD analysis. It indicates that WS 2 decomposed into W and S elements during laser cladding process, in which S reacted with the melting Cr to form CrS in the molten pool [ 19 ]; thus, CrS appears in the coating 2, coating 4, coating 5, and coating 6.…”

Section: Resultsmentioning

confidence: 99%

“…Flat plate of unheated-treated Cr12MoV steel with the dimension of 50 mm × 50 mm × 10 mm was selected as substrate. According to Xiao-Long Lu’s [ 19 ] research, WS 2 is easily decomposed to form S and W elements during laser cladding due to its low decomposition temperature, in which S can react with Cr to form CrS in the molten pool . In addition, Stellite 6 is a common Co-based alloy powder with a high Cr content, which is favorable for the reaction to form CrS.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, the solid-lubricant phase was synthesized using the high-energy method that shows promise for producing MMSCs [ 8 , 18 , 19 , 20 ], which could avoid the decomposition and oxidization of lubricants [ 8 ]. Skarvelis et al [ 18 ] fabricated a MMSC containing TiS and Ti4C 2 S 2 on AISI 1522H plain steel substrate by plasma transferred arc of TiS 2 and TiC powder mixture.…”

Section: Introductionmentioning

confidence: 99%

“…Results showed that the formation of TiS and Ti4C 2 S 2 in the coating was beneficial to the coating’s tribological properties. Lu et al [ 19 ] fabricated the Ti 2 CS/CrS MMSC by laser clad NiCr/Cr 3 C 2 -WS 2 mixed powders; the results indicated that the composite coating presented excellent self-lubricating properties due to the formation of the lubricious CrS and Ti 2 CS sulfides. Among those studies, the friction-reducing role of self-lubrication phases (such as TiS, Ti 2 CS, and CrS) has been investigated in detail and the formation mechanism of CrS is also involved.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Fabrication and Effect of NbC on Microstructure and Tribological Properties of CrS Co-Based Self-Lubricating Coatings by Laser Cladding

et al. 2017

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The CrS/NbC Co-based self-lubricating composite coatings were successfully fabricated on Cr12MoV steel surface by laser clad Stellite 6, WS2, and NbC mixed powders. The phase composition, microstructure, and tribological properties of the coatings ware investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS), as well as dry sliding wear testing. Based on the experimental results, it was found reactions between WS2 and Co-based alloy powder had occurred, which generated solid-lubricant phase CrS, and NbC play a key role in improving CrS nuclear and refining microstructure of Co-based composite coating during laser cladding processing. The coatings were mainly composed of γ-Co, CrS, NbC, Cr23C6, and CoCx. Due to the distribution of the relatively hard phase of NbC and the solid lubricating phase CrS, the coatings had better wear resistance. Moreover, the suitable balance of CrS and NbC was favorable for further decreasing the friction and improving the stability of the contact surfaces between the WC ball and the coatings. The microhardness, friction coefficient, and wear rate of the coating 4 (Clad powders composed of 60 wt % Stellite 6, 30 wt % NbC and 10 wt % WS2) were 587.3 HV0.5, 0.426, and 5.61 × 10−5 mm3/N·m, respectively.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%