塩浴窒化した球状黒鉛鋳鉄の耐摩耗性について

抄録

  The dry wear resistance of liquid nitrided (Tuftride Process) spheroidal graphite cast iron with ferritic and bull’s eye’s matrices were investingated by Amsler wear testing machine. Perfect rolling, perfect sliding and rolling accompanied by a small amount of sliding were repeated on the surface of the specimens.
  Under perfect rolling and sliding conditions, the wear resistance of nitrided irons was higher than that of non-nitrided irons. It was found that ferritic iron offered the most effective wear resistance by nitriding. The wear resistance of nitrided irons is high due to the specially superior property of the Fe nitrided surface layer against wear resistance and the increase of fatigue strength at the diffusion zone. Under rolling with sliding, it was found that nitrided irons always exhibited a higher wear loss than those of non-nitrided irons owing to the decomposition of Fe nitride by the higher shearing stress concentration at the surface compound layer.