Abstract
This is the second report for the “Impact Torsion Test of Quenched and Tempered Tool Steels”.(1) The Impact torsion values of heat-treated 10 kind tool steels were measured by changing tempering temperatures; the results are shown in Table 1 and Figs. 1 to 11. The impact values show some max. points between 150° and 200° in the tempering temperature, indicating that β-marteusite is more tough than _??_. The amount of this toughness is generally small, except Cr-W steel as shown in Fig. 5. The max. values as reported by Luerssen and Green in America on carbon tool steels were not obtained for carbon steels, but Cr-W steel is found to be comparable with their résult. The impact torsion test is a suitable method for measuring toughness of hard and brittle materials, the relation between Charpy Impact values being shown in Fig. 12.
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