Correlation of microstructure and fracture toughness in three high-speed steel rolls |
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Authors: | Sunghak Lee Chang Gil Lee Kee-Sun Sohn Byung Il Jung |
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Affiliation: | (1) the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784 Pohang, Korea;(2) Present address: Center for Advanced Aerospace Materials, Pohang University of Science and Technology, United Kingdom;(3) Department of Materials, Queen Mary and Westfield College, University of London, E1 4NS London, United Kingdom;(4) the Roll Technology Department, Kangwon Industries, Ltd., 790-370 Pohang, Korea |
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Abstract: | The objective of this study is to clarify the fracture characteristics of high-speed steel (HSS) rolls in terms of microstructural factors such as matrix phase and primary carbide particles. Three HSS rolls with different chromium contents were fabricated by centrifugal casting, and the effect of the chromium addition was investigated through microstructural analysis, fracture-mechanism study, and toughness measurement. The hard and brittle primary carbides, as well as the eutectic carbides (ledeburites), were segregated in the intercellular regions and dominated overall properties. Observation of the fracture process revealed that these primary carbides cleaved first to form microcracks at low stress-intensity factor levels and that the microcracks then readily propagated along the intercellular networks. The addition of chromium to a certain level yielded microstructural modification, including the homogeneous distribution of primary carbides, thereby leading to enhancement of fracture toughness of the HSS rolls. |
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