日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 4 (1957),
pp. 206-210

On the Mechanical Properties of Rapid-Heated and Quenched Steel (4th Report)

Sigeo Ôwaku and Kazuaki Iijima


Abstract:

The effects of quenching methods—semi-rapid heating and quenching, and ordinary quenching— on the hardness, the fatigue limit and the bend-breaking stress have been studied with quenched and tempered 0.81%C steel wire specimens. The results were as follows: (1) The hardness differences due to these two quenching methods are negligibly small. The hardness decreases nearly continuously as the tempering temperature rises. (2) The fatigue limit differences due to the quenching methods are also small when the tempering temperature is higher than 300°. The fatigue limit decreases as the tempering temperature rises, consequently as the hardness decreases. (3) But the fatigue limit and the band-breaking stress differences are noticeably larger, when the tempering temperature is lower than 300°. Semi-rapid heated and quenched specimens show superior values as compared with ordinary quenched ones. And these properties are improve as the tempering temperature rises. (4) The above results can be explained by the negative effects on the properties of quenched steel of the microstress induced by martensite formation in each austenite grain.


(Received 1956/10/17)

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