球状黒鉛鋳鉄の組織と耐溶損性に及ぼすアルミニウム添加の影響

抄録

In a previous study, we have clarified that addition of aluminum to gray cast iron and heat treatment to form an oxide layer on the surface improved the erosion resistance of the cast iron to aluminum alloy melt. The purpose of this study is to clarify the effect of aluminum addition on microstructure and erosion resistance to aluminum alloy melt of ductile cast iron, which has excellent mechanical properties. Tensile tests were carried out and evaluation of erosion resistance were carried out by immersing the test piece in AC4A aluminum alloy melt and stirred. Addition of aluminum in the ductile cast iron decreased nodular graphite. The tensile strength of ductile cast iron with 1.0 mass% aluminum was equivalent to that of gray cast iron (FC250). Ductile cast iron showed an inferior erosion resistance to that of gray cast iron, regardless of the nodularity. The higher nodularity slightly decreased the resistance, judging from the appearances of test pieces.