含チタン鋳鉄の黒鉛形状に及ぼす窒素の影響

抄録

  The kinds of titanium compound and graphite shape, etc., were studied in normal cast iron containing titanium and nitrogen. The results obtained are as follows:
  (1) Titanium in cast iron combines with nitrogen in iron at first, and, after all nitrogen contained converts to TiN, excess titanium forms TiC.
  If atomic ratio Ti/N is over than 4, TiN disappears and TiC exists alone. TiC may solid-solute nitrogen,
  (2) In the chemical composition range of TiN alone, the shape of graphite is flaky, and, when TiC appears, eutectic graphite exists partially. All eutectic structure is gained when all titanium compound is TiC.
  (3) Tensile strength and hardness of iron are somewhat low in the area of two compounds, and they are pretty high in the area of flaky graphite alone or eutectic graphite alone.