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13.
Effect of microstructure on fracture toughness scatter [Elektronski vir]
Podgornik, Bojan ; Leskovšek, Vojteh
Dies and tools used in hot metal forming (extrusion, forging, rolling, etc.) are exposed to elevated temperatures and high contact pressures, and therefore to wear and mechanical and thermal fatigue. ...Fracture toughness is thus one of the main material properties used when selecting and optimizing heat treatment of tools and dies. However, fracture toughness data alone is not sufficient and need to be supported by other material properties and features. The aim of the present research work was to correlate fracture toughness properties of hot work tool steel, especially its scatter to the local microstructure, microhardness and composition and to establish methodology for proper evaluation of tool steel's fracture toughness. Research was performed on non-standard, circumferentially notched and fatigue-precracked tensile-test specimens from H11 type hot work tool steel, with fatigue precrack formed under rotating-bending loading before the final heat treatment. Specimens heat treated under the same conditions but displaying greatly different fracture toughness were further examined in terms of fractured surface. Paper presents method for sucessive examination of fractured surface, which allows variations in fracture toughness to be correlated to the local changes in microstructure. Results show that presence of any weak point, either in a form of non-metallic inclusions, large undissolved eutectic carbide clusters and bands, or their combination, especially if located in the region of positive segregation and close to the fatigue crack tip will lead to considerable reduction in fracture toughness.
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