高硬度工具鋼の靭性測定に用いた静および衝撃捩り試験の再現性と精度について

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  • The Reproducibility and Accuracy of Static and Impact Torsion Tester Used for Measuring the Toughness of Highly Hardened Tool Steels
  • 高硬度工具鋼の靱性測定に用いた静および衝撃捩り試験の再現性と精度について
  • コウコウド コウグ コウ ノ ジンセイ ソクテイ ニ モチイタ セイ オヨビ ショウゲキ ヨジリ シケン ノ サイゲンセイ ト セイド ニ ツイテ

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抄録

In order to increase the reliability on the future measuring value of toughness of highly hardened tool steels, some experiments on the reproducibility and the accuracy of testing values measured by the static and impact torsion tester, devised by the author, have been repeatedly carried out with parallel specimens of the same composition and shape.<BR>These specimens made from carbon tool steel containing 0.80%C were hardened under the same condition and tempered at different temperatures between 100° and 200°C.<BR>They were then fractured by both static torsion and impact torsion respectively to measure several mechanical properties in static test and torsion impact energy, following which the mean values and their standard deflections of the measured values obtained from eight or ten parallel specimens coresponding to the different temperings were calculated. The accuracy of the calculations was scrutinized performed by means of statistics.<BR>As the results, it has been clarified that the yield strength, maximum torque, modulus of rigidity and elastic work of deformation consumed up to fracture can be reproduced in a smaller standard deflection than that of impact energy, and that, as the discrimination for these expressing values between temperings at 150° and at 200°C is far larger in impact energy than in the several properties of static torsion, impact torsion test may have better sensibility in detecting the toughness of highly hardened tool steels in spite of its larger scattering in the testing values.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 28 (3), 137-144, 1964

    公益社団法人 日本金属学会

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