A New Tempering Parameter and Its Application to the Integration of Tempering Effect of Continuous Heat Cycle

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Other Title
  • 新しい焼もどしパラメータとその連続昇温曲線に沿つた焼もどし効果の積算法への応用
  • 新しい焼もどしパラメータとその連続昇温曲線に沿った焼もどし効果の積算法への応用
  • アタラシイ ヤキモドシ パラメータ ト ソノ レンゾク ショウオン キョクセン

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Description

A new tempering parameter (λ-value) has been defined basing on Arrhenius' equation so as to express the degree of tempering and to maintain the equivalence of time and temperature over a wide range of tempering conditions. <BR>Activation energy of the tempering process governing the changes in such mechanical properities as tensile and yield strength and hardness was determined by using a plain carbon steel and low alloy steels containing manganese, chromium and molybdenum. The activation energies obtained were to be 70 kcal/mol (295 kJ/mol) in carbon steel and about 100 kcal/mol (420 kJ/mol) in Cr-Mo steel, increasing with alloy contents.<BR>Using these activation energies, mechanical properties of tempered steel can be approximately expressed as a function of λ-value in a linear fashion for any combination of temperature and time, ranging from 400 °C to 700 °C and from 0.01 h to 1000 h, respectively.<BR>In addition, making use of the parameter, an analytical method of tempering effect is applied to a practical heat program by summarization of the tempering effects of two individual processes or integration of the tempering effect over a whole process of heat cylce in which temperature steadily changes. Predicted mechanical properties by this method were in good accordance with observed values.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 66 (10), 1532-1541, 1980

    The Iron and Steel Institute of Japan

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