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Purpose: of the presented investigations was showing that the crack resistance of tool steels depends on their hardenability and phase transformations occurring in the quenched matrix at tempering. The chemical composition of austenite decides on the steel hardenability while phase transformations after tempering can be influenced (apart from the chemical composition) by the heating method. Design/methodology/approach:...
Purpose: This paper is an attempt of reviewing the outlooks about the favourable influence of retained austenite on fracture toughness of tool steels according to results of investigation concerning relations between tempering temperature, hardness, fraction of retained austenite and fracture toughness. Design/methodology/approach: The tests were performed on the samples made of the 70MnCrMoV9-2-4-2...
Purpose: The aim of this study was a review of opinions molded within last 35 years on a part of steel cracking process played by retained austenite. Design/methodology/approach: Dependencies between volume fraction of retained austenite, its stability, hardness, fracture toughness, and tempering temperature of hardened 70MnCrMoV9-2-4-2 steel were determined. On the ground of analysis of those dependencies...
This paper is an attempt of reviewing the outlooks about the favourable influence of retained austenite on fracture toughness of tool steels. The tests were performed on the samples made of the new 70HG2MF steel in which the fraction of retained austenite was changed by subquenching or by changing the austenitizing temperature. It was revealed that in the subquenched samples retained austenite affects...
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