27%Cr鋳鉄の耐衝撃摩耗に及ぼす焼入れ温度の影響

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  • Influence of Quenching Temperature on Impact-wear Resistance of 27%Cr Cast Iron
  • 27%Cr チュウテツ ノ タイショウゲキ マモウ ニ オヨボス ヤキイレ オンド ノ エイキョウ

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<p>  It has already been reported that the use of a chiller which suppresses the occurrence of internal casting defects in cast products of 27%Cr cast iron results in the deterioration of impact-wear resistance in the as cast state. In this paper, impact-wear behavior of 27%Cr cast iron was investigated after quenching at various temperatures to improve the impact wear resistance. Evaluation of impact-wear resistance was based on wear loss and decrease of thickness using air blasting machine. Microstructural analysis was performed using a scanning electron microscope with energy dispersive X-ray spectrometer, X-ray diffractometer and ferrite meter. Quenching at temperatures over 1323K results in improved impact wear resistance, as compared with the as cast state. Below that temperature, impact-wear becomes severe. This can be explained by the change in the volume fraction of retained austenite and martensite in the matrix and the self-temper softening of martensite caused by the generation of impingement heat between abrasive media and experimental samples.</p>

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  • 鋳造工学

    鋳造工学 93 (1), 11-19, 2021-01-25

    公益社団法人 日本鋳造工学会

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