Source analysis of hardness deviation of WC-based cemented carbide coating
WC-12Ni coating was prepared on 17-4PH martensitic stainless steel substrate by high velocity oxy-fuel(HVOF)spraying,and the micro-Vickers hardness of the coating and substrate steel was measured by digital micro-hardness tester.The microstructure of the coating was characterized by field emission scanning electron microscopy(FE-SEM).The average hardness of the obtained hardness was calculated with 5,10,15,20,25,30,40 and 50 indentation data,and the relative deviation,range,average deviation and relative standard deviation were used for deviation analysis.By comparing the hardness and deviation of the coating and the substrate,the relationship between the deviation and the number of hardness indentation tests is obtained.Finally,combined with the uneven structural factors of the coating,the source of the test deviation of the coating Vickers hardness is summarized.
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