Nodule count effect on microstructure and mechanical properties of hypo-eutectic ADI alloyed with nickel

Samples of ductile iron alloyed with 0.88 % Ni with a nodule count of 606, 523, and 290 nod/mm2 were obtained from sand cast plates of different thickness in the range from 8.46 to 25.4 mm. The effect of the nodule count was evaluated during the austempering process held at 285?C and austempering ti...

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Bibliographic Details
Published in:Journal of mining and metallurgy. Section B, Metallurgy Metallurgy, 2021, Vol.57 (1), p.115-124
Main Authors: Colin-García, E., Cruz-Ramírez, A., Romero-Serrano, J.A., Sánchez-Alvarado, R.G., Gutiérrez-Pérez, V.H., Reyes-Castellanos, G.
Format: Article
Language:English
Subjects:
adi
Alloying
Austenite
Brinell hardness
Carbon
Carbon content
ductile iron
Ductility
Mechanical properties
Microstructure
Nickel
Nodular iron
nodule count
process window
Temperature
Tensile strength
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Summary:Samples of ductile iron alloyed with 0.88 % Ni with a nodule count of 606, 523, and 290 nod/mm2 were obtained from sand cast plates of different thickness in the range from 8.46 to 25.4 mm. The effect of the nodule count was evaluated during the austempering process held at 285?C and austempering times of 15, 30, 45, 60, 70, and 90 min. The volume fraction of high carbon austenite increased when the nodule count increased, however, the carbon content of the high carbon austenite kept almost constant. The process window was narrow, requiring a lower austempering time when the nodule count increased. The combination of a higher nodule count and low austempering temperature allowed obtaining a fine ausferritic microstructure which led to higher Brinell hardness and tensile strength. The process window was determined by XRD measurements and it was in good agreement with the microstructural and hardness evolution as the austempering time increased.
ISSN:1450-5339
2217-7175
DOI:10.2298/JMMB200403009C