Abstract
Friction and wear properties of hot working die steel at above 800 °C are of particular interest for high temperature applications. Here, novel AlCoCrFeNiWx high-entropy alloy (HEA) coatings have been fabricated on the surface of hot working die steel by laser cladding. The effects of the as-prepared AlCoCrFeNiWx HEA coatings on the microstructure and high temperature friction and wear behavior of hot working die steel are investigated through scanning electron microscopy (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD), and X-ray absorption fine structure (XAFS). Having benefited from the formation of W-rich intermetallic compounds after the addition of W elements, the high temperature wear resistance of the coatings is obviously improved, and friction coefficient shows a large fluctuation. The microstructural characteristics of the AlCoCrFeNiWx HEA coatings after the high temperature wear resistance test shows a highly favorable impact on microstructure stability and wear resistance, due to its the strong lattice distortion effect of W element on BCC solid solutions and the second phase strengthening of the W-rich intermetallic compounds. These findings may provide a method to design the high temperature wear resistant coatings.
Highlights
Hot working die steel is widely used in tooling applications, including die casting, hot extrusion, hot forging, and hot stamping, due to its unique features including high strength and hardness [1,2,3,4,5]
AlCoCrFeNi high-entropy alloy (HEA) composed of a single BCC solid solution phase shows excellent corrosion resistance and has great potential for surface coating applications [13,17,19,20,21,22]
To overcome the aforementioned shortcomings, we offer an alternative approach for fabricating high temperature wear resistant HEA coatings on H13 hot working die steel
Summary
Hot working die steel is widely used in tooling applications, including die casting, hot extrusion, hot forging, and hot stamping, due to its unique features including high strength and hardness [1,2,3,4,5]. AlCoCrFeNi HEA composed of a single BCC solid solution phase shows excellent corrosion resistance and has great potential for surface coating applications [13,17,19,20,21,22]. From the perspective of the dispersion strengthening mechanism, WC, TiC ceramic particles are commonly used as reinforcement phases in high-entropy alloys [10,12,23] These granular-shaped precipitates can improve the microhardness and wear resistance of the coating. We proved that the microstructure becomes more stable and enhances wear resistance of AlCoCrFeNiWx HEA on H13 steel by the strong lattice distortion effect of W element on BCC solid solutions and the second phase strengthening of the W-rich intermetallic compounds
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