研究目的
To optimize the residual stresses in laser-mixed WC(Co, Ni) coatings by evaluating the influence of mixture ratios on residual stresses using mixture design.
研究成果
The reduced special quartic model accurately predicts residual stresses, with an optimal blend of 57% WC, 39% Ni, and 4% Co yielding the lowest residual stress (37.92 MPa) and reduced cracking susceptibility. The ternary mixture generally shows higher residual stresses than binary mixtures except WC/Co.
研究不足
The study focuses on specific powder sizes and laser parameters; variations in these could affect results. The model's accuracy may be limited to the tested mixture ranges, and scalability to industrial applications requires further validation.
1：Experimental Design and Method Selection:
A simplex-centroid mixture design with response surface methodology was used to study the effect of three-component mixtures (WC, Co, Ni) on residual stress. The reduced special quartic model was employed for fitting data.
2：Sample Selection and Data Sources:
WC, Co, and Ni powders with sizes of 125 to 300 μm were blended in various proportions and clad onto 40Cr steel substrates. Residual stress data were obtained using X-ray diffraction.
3：List of Experimental Equipment and Materials:
Equipment included an IPG YLS-3000 fiber laser, 6-axis robot, powder feeder (HUST III), SEM (Hitachi S-2600H), and XRD diffractometer (Proto iXRD). Materials included WC, Co, Ni powders, and 40Cr steel.
4：Experimental Procedures and Operational Workflow:
Powders were coaxially fed into the laser-induced melt pool. Specimens were prepared, etched, and analyzed for microstructure and residual stress using SEM and XRD.
5：Data Analysis Methods:
Data were analyzed using SPSS20 software for regression and response surface methodology, with the reduced special quartic model used for prediction.
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fiber laser
YLS-3000
IPG
Used for laser cladding to melt and fuse the powder mixtures onto the substrate.
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scanning electron microscope
S-2600H
Hitachi
Examines the morphologies, crack morphology, and element distribution in the coatings.
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powder feeder
HUST III
Feeds the WC, Co, and Ni powders coaxially into the laser-induced melt pool.
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XRD diffractometer
Proto iXRD
Proto
Estimates residual stress at the bead centerline using the sin2ψ method.
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software
SPSS20
SPSS
Analyzes residual stress data and supports regression, experimental design, and response surface methodology.
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