Effects of Graphite Nodule Count and Pearlite Lamellar Spacing on Mechanical Properties of Fine Pearlitic Spheroidal Graphite Cast Iron

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  • 微細パーライト球状黒鉛鋳鉄の機械的性質に及ぼす黒鉛粒数とパーライト層間隔の影響
  • ビサイ パーライト キュウジョウ コクエン チュウテツ ノ キカイテキ セイシツ ニ オヨボス コクエンリュウスウ ト パーライトソウ カンカク ノ エイキョウ

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  In this study, the effects of various amounts of copper (Cu) addition on mechanical properties of spheroidal graphite cast irons containing 1.0 mass% manganese (Mn) and rare earth elements (RE) were investigated. The effects of graphite nodule count and pearlite lamellar spacing on mechanical properties of spheroidal graphite cast irons containing 1.0 mass% Mn and 2.5 mass% Cu were also investigated.<br>  As a result, tensile strength increased with increasing Cu addition. Especially, high tensile strengths of 900 and more than 1200 MPa were obtained in Y-block and 10 mm diameter specimens added with 1.0 mass% Mn and 2.5 mass% Cu, respectively.<br>  On the other hand, in different graphite nodule count specimens added with 1.0 mass% Mn and 2.5 mass% Cu, tensile strength and hardness increased with decreasing thickness of the specimens. Fine pearlite lamellar spacing in thin section specimens was observed by means of field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM).

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