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Development of as-cast dual matrix structure (DMS) ductile iron

机译：铸态双矩阵结构球墨铸铁的开发

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摘要

Ductile iron is widely used due to its low cost and higher ductility than other cast irons. There has been an increased interest during the last years in improving the strength of these materials by means of heat-treating to obtain dual matrix structures (DMS) that enhance the properties found in Austempered Ductile Irons (ADI). This work studies the fabrication of DMS ductile cast irons with marterteitic and bainitic structures in the as-cast condition, reducing costs related to heat treating processing while improving the mechanical behavior of the material. Cast irons alloyed with nickel ranging from 0% up to 7% were produced in order to evaluate the effect of Ni-Mo content on the phase transformations and mechanical properties of the material. The effect of cooling rate in phase transformations and mechanical properties were studied using molds with different wall thicknesses, finding that addition of Nickel and Molybdenum improves substantially the strength of the as-cast ductile iron, making unnecessary any further heat treating according to the level of properties desired.
机译：球墨铸铁比其他铸铁具有低成本和高延展性，因此得到了广泛的应用。在过去的几年中，人们对通过热处理来获得增强了奥氏体球墨铸铁（ADI）性能的双基体结构（DMS）来提高这些材料的强度的兴趣日益浓厚。这项工作研究了铸态条件下具有马氏体和贝氏体组织的DMS球墨铸铁的制造工艺，从而降低了与热处理相关的成本，同时改善了材料的机械性能。为了评估Ni-Mo含量对材料的相变和机械性能的影响，生产了含0％至7％镍的合金铸铁。使用壁厚不同的模具研究了冷却速率对相变和机械性能的影响，发现添加镍和钼可以显着改善铸态球墨铸铁的强度，从而无需根据合金的含量进行任何进一步的热处理。所需的属性。

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