微量ほう素含有球状黒鉛鋳鉄の組織と機械的性質に及ぼすクロム，バナジウム添加の影響

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タイトル別名
  • Effects of Chromium and Vanadium Addition on Microstructure and Mechanical Properties of Spheroidal Graphite Cast Iron Containing Small Amount of Boron
  • ビリョウ ホウソ ガンユウ キュウジョウ コクエン チュウテツ ノ ソシキ ト キカイテキ セイシツ ニ オヨボス クロム バナジウム テンカ ノ エイキョウ

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抄録

The presence of small amounts of boron in spheroidal graphite cast iron has been reported to cause the problem of reduction in the area ratio of pearlite and hardness of spheroidal graphite cast iron. One method to increase the area ratio of pearlite is alloying by pearlite promoting elements. The effects of adding varied amounts of chromium and vanadium to increase the pearlite in spheroidal graphite cast iron containing small amounts of boron are discussed in this paper. 0.4% chromium and 0.6% vanadium are required to regain normal mechanical properties (tensile strength and hardness) and the area ratio of pearlite. In this research, it was found that chromium addition is significantly more effective for increasing the pearlite compared to vanadium addition, and that all-pearlite matrix can achieved by adding 0.8% chromium. The presence of chromium in cementite is assumed to stabilize the cementite and increase the pearlite content. On the other hand, the addition of 0.6% to 1% chromium was found to result in the loss of boron from the surface of spheroidal graphite and in the presence of boron in cementite.

収録刊行物

  • 鋳造工学

    鋳造工学 82 (3), 157-162, 2010

    公益社団法人 日本鋳造工学会

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