各種工具鋼の燒戻による硬度と靱性の變化

概要

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Superior tools must have, not only high hardness, but also considerable toughness. Hardness of the tools must be generally higher than about 55 (Rockwell C 150kg), to show the good cutting ability. It is, therefore, difficult to study the little differences of the toughness of these hard steels by the Charpy impact test or by the tensile test. Thus the authors measured the change of the impact torsion values by different tempering temperatures. At the same time, they made the crushing (bending) tests and measured the crushing (bending) strength, the deformation amount and the energy consumed until their failure. The tool steels studied were : (1) Two series of carbon steels and 1% chromium steels, both containing about 0.6∿1.5%C (2) Special tool steels, that is, Cr-W and Cr-W-V steels and (3) High speed steels. From these results, the authors discussed the change of the hardness and the toughness of the tool steels by different tempering temperatures, comparing them with that of their microstructures.
社団法人日本鉄鋼協会の論文
1951-12-25