一、绪言一般蠕墨铸铁在厚壁件中壁厚敏感性是好的,但几乎没有文献报道5毫米以下薄壁件的壁厚敏感性。经验表明,当用蠕墨铸铁浇注薄壁件时,要遇到由壁厚差造成的材质的不稳定性,即薄壁处和厚壁处石墨形状的差异。由于薄壁处的球墨铸铁化倾向,减弱了蠕墨铸铁的特性,因此被看作是这种铸铁面临的课 I. INTRODUCTION Generally, the wall thickness sensitivity of compacted graphite cast iron in thick-walled parts is good, but there is almost no reported wall thickness sensitivity of thin-walled parts below 5 mm. Experience has shown that when compacted with compacted graphite cast iron thin-walled pieces, to encounter the material instability caused by poor wall thickness, that is, at the thin-walled and thick wall at the graphite shape difference. Due to the ductile iron tendencies at the thin walls, the properties of vermicular cast iron are weakened and are therefore considered as the face of the cast iron