Abstract
Abstract The investigated indefinite chill materials are designed for highest wear resistances for surface-critical applications in hot strip mills. The microstructure consists of tempered martensite together with cementite and MC carbides as well as a certain amount of graphite in different morphologies. These alloys have very high hardness values and a poor toughness which makes it rather difficult to measure the mechanical properties with standard testing methods. These materials were successfully tested with the 4-point bending method and reliable and comprehensible values for the flexural strength and the Young's modulus were generated. A clear correlation between those values and the total amount of carbides and graphite was found. Also, both values are dependent from the shape of the graphite precipitations. The investigations prove that the 4-point bending test is a feasible method to test the mechanical properties of indefinite chill alloys.
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