Abstract
Advanced processing of a workpiece, such as by carburization, will modify its surface. Accurate measurement of fracture toughness of such a surface-modified layer is important for fatigue resistance manufacturing, but is still a challenge. A method to characterize fracture toughness of the surface-modified layer using a layering treatment and continuous indentation test is proposed. The load–depth curve obtained from continuous indentation testing with a Vickers indenter was used to characterize the fracture toughness of the surface-modified layer produced by carburizing heat treatment of 18CrNiMo7-6 alloy steel. Variation of fracture toughness with depth of the surface-modified layer was determined.
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