高硬度工具鋼の靭性に関する研究

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タイトル別名
  • Study on the Toughness of Highly Hardened Tool Steels
  • 高硬度工具鋼の靱性に関する研究
  • コウコウド コウグ コウ ノ ジンセイ ニ カンスル ケンキュウ

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抄録

In order to clarify the varying behaviors of toughness in highly hardned tool steels by different heat treatments, the author first devised static and impact torsion testers. Then the effects of both tempering and austenitizing temperature on the toughness of highly hardened carbon tool steels were examined with a test piece in a particular shape by these testers. In addition, several kinds of hardened high speed steels were also tested by the same method to compare the toughness with carbon tool steels.<BR>According to the results, in carbon tool steels the several expressing values of toughness are gradually improved with the tempering temperature, but they have a peak in the vicinity of 200°C and a valley around 250°C in the tempering range up to 300°C and these changes have an analogous tendency in both tests except the clearer discrimination in the impact torsion values. On the other hand in the same hardness level an austenitizing temperature which gives the best mechanical properties in static torsion test is about 40°∼80°C lower than that for the maximum impact energy.<BR>It is also revealed that high speed steels under a highly hardened condition are much tougher than hardened carbon tool steels in the same hardness level of about 64 Rc.<BR>Thus it is probable that the high wear resistance of tools made from high speed steels may mainly owe to their higher toughness, because the excellent toughness at the tool edge markedly decreases the minute chipping during the cutting, and therefore this toughness in many hardned tools is believed to be one of the most important properties against premature wear.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (3), 129-136, 1964

    公益社団法人 日本金属学会

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