Effects of Solution Treatment on the Microstructure and Properties of W6Mo5Cr4V2/WC Composite Cladding Layer
Description
To enhance the surface properties and service life of 35CrMnSi alloy steel, a W6Mo5Cr4V2/WC mixed powder composite cladding layer was fabricated via laser cladding. Subsequently, the effects of solution treatments at 1000 ℃, 1020 ℃ and 1040 ℃ on the microstructure and wear resistance of the cladding layer were systematically investigated. XRD, SEM and EDS analyses revealed that the phase composition of the solution treated cladding layer primarily consisted of carbides (WC, SiC, MnC8, Cr7C3) and an intermetallic compound (MnV). As the solution temperature increased from 1000 ℃ to 1020 ℃, the reticular structure within the cladding layer dissolved, leading to the precipitation of fine and uniformly distributed granular and globular carbides. At this temperature, the gradual decomposition of WC particles promoted the formation of secondary carbides within the cladding layer, thereby enhancing the solid solution strengthening and dispersion strengthening effects. With the further temperature increase to 1040 ℃, the globular carbides underwent abnormal agglomeration, evolving into coarse lamellar carbides. The cladding layer exhibited optimum performance under the 1020 ℃ solution condition, when the microhardness reached 832 HV0.1, representing a 5.7% increase compared to the as-clad composite cladding layer, the coefficient of friction was 0.34, the wear mass loss was 2.1 mg, and the wear track width and depth were 268 μm and 30 μm, respectively. These findings underscore the significant impact of solution treatment temperature on the microstructure and mechanical properties of the W6Mo5Cr4V2/WC composite cladding layer.
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Institutions
- Shenyang University of TechnologyLiaoning, Shenyang