Effects of austempering temperature on microstructure and surface residual stress of carbidic austempered ductile iron (CADI) grinding balls

To develop a high performance gray cast iron with high tensile strength and thermal conductivity, multivariable analysis of microstructural effects on properties of gray cast iron was performed. The concerned parameters consisted of graphite content, maximum graphite length, primary dendrite percentage and microhardness of the matrix. Under the superposed influence of various parameters, the relationships between thermal conductivity and structural characteristics become irregular, as well as the effects of graphite length on the strength. An adaptive neuro-fuzzy inference system was built to link the parameters and properties. A sensitivity test was then performed to rank the relative impact of parameters. It was found that the dominant parameter for tensile strength is graphite content, while the most relative parameter for thermal conductivity is maximum graphite length. The most effective method to simultaneously improve the tensile and thermal conductivity of gray cast iron is to reduce the carbon equivalent and increase the length of graphite flakes.

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Precipitation and evolution of nodular graphite during solidification process of ductile iron

Liu

Yan

Zhao

et al. 2020

China Foundry

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D uctile iron is an indispensable engineering material with excellent mechanical performances. Its tensile strength is even comparable to that of steel because the existence of graphite in a spherical shape reduces the cleavage effect of stress concentration in the matrix [1, 2]. In recent years, it has been found that austempered ductile iron (ADI) and carbidic austempered ductile iron (CADI), which are obtained by the austempering process, have higher strength and shock absorption, as well as good wear resistance and plastic toughness, giving rise to ductile iron being more widely used [3-5]. The quantity and morphology of graphite have a great influence on the properties of ductile iron. For examples, graphite nodules with small diameter and high roundness can significantly improve

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Effects of austempering temperature on microstructure and surface residual stress of carbidic austempered ductile iron (CADI) grinding balls

Cited by 7 publications

References 28 publications

Microstructure and Properties of High Manganese Carbidic Austempered Ductile Iron

Microstructure and Properties of High Manganese Carbidic Austempered Ductile Iron

Fuzzy neural network analysis on gray cast iron with high tensile strength and thermal conductivity

Precipitation and evolution of nodular graphite during solidification process of ductile iron

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