軸受鋼の研究 (IV) : リング状試片の内部応力に及ぼす焼入温度の影響

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概要

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• The method for measuring the internal stress of the ring-type test pieces such as ball bearing was not established firmly, and so the calculating formula for measuring two demensional stresses of it was obtained. By using this formula, the effect of tempering temperature on the internal stress of the ring-type ball bearing steels was studied and the results were obtained as follows. (1) In case of oil quenching of the ring-type test pieces, the radial internal stress was very small in comparison with the circumferential internal stress. The latter was tension-stress near the inner face. In quenching, the circumferential stress was about+76.9kg per mm^2 (tension) at about 1.4mm, and then about-28.3kg per mm^2 (compression) at about 5.5mm from the inner face. (2) In case of the 130℃×1 hr tempering, the internal stress increased about twice by the ε carbide precipitation. The circumferential stress was about+139.5kg per mm^2 at about 1.4mm from the inner face. (3) When the 180℃ tempering ring-type test piece was compared with the 130℃ tempering one, the former increased a little in the circumferential stress distribution. If the tempering temperature raised such as the above, the internal stress should be reduced by the stress relief. But the internal stress increased a little in fact. This cause was considered to be the expansion phenomenon that the retained austenite decomposed to martensite at 180℃×1 hr tempering. It was necessary for the 180℃ tempering to be avoided in the pratical heat-treatment. (4) In case of the 200℃×1 hr tempering, the internal stress decreased in comparison with the 180℃ and 150℃ tempering. The circumferential stress was about +25.1kg per mm^2 (tension) at about 1.4mm from the inner face.

• 1956-01-01

著者

• 上野 学

  工業技術院機械試験所

• 村 外志夫

  明治大学工学部

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• 59 軸受鋼の研究 (III) : 酸性平炉鋼, 塩基性電気炉鋼及び S.K.F 素材のオーステナイト状態の挙動(第 49 回講演大会講演大要)
• 軸受鋼の研究 (IV) : リング状試片の内部応力に及ぼす焼入温度の影響
• 60 軸受鋼の研究 (IV) : リング状試片の内部応力に及ぼす焼戻温度の影響(第 49 回講演大会講演大要)
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