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Phase composition of Austempered Ductile Iron

The as cast microstructure of ductile iron with modulus Ms = 1.25cm is 6.0% pearlite + 94.0% ferrite. Several samples with the size of Φ 10cm × 10cm were cut from the ductile iron test bar, and then they were isothermal transformed at 920 ℃ / 2H + X...

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Hardness of austempered ductile iron alloy

Effect of as cast microstructure on hardness of Austempered Ductile Iron The hardness test results of Austempered Ductile Iron with different as cast microstructure after treatment at 920 ℃ / 2H + 280 ℃ / 1.5hr shows that when the modulus Ms = 0.25mm, ADI has the largest hardness,...

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Research contents of Austempered Ductile Iron

(1) EPMA analysis of carbon content in austenite of ductile iron ① The effects of austenitizing temperature and austenitizing holding time on carbon content in austenite of nodular iron during austenitizing process; ② The correlation between matrix type and casting modulus of as cast ductile iron and carbon content...

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Research target of Austempered Ductile Iron

By strictly controlling the chemical composition, melting process, spheroidizing inoculation process and casting modulus of nodular iron, high-quality nodular iron with different as cast structure was prepared. The nodularization rate of graphite was more than 80%, the number of graphite balls was not less than 170 / mm2, and...

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Problems in research of Austempered Ductile Iron

Heat treatment is usually used in strengthening and toughening treatment of ductile iron. The heating temperature of most heat treatment processes is higher than the upper limit of critical eutectoid temperature (AC upper limit) of nodular iron heating, which involves the austenization process of nodular iron matrix structure, which...

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