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Effect of Two-Step Austempering Process on the Microstructure and Mechanical Properties of Low-Carbon Equivalent Austempered Ductile Iron

Journal Article
05-17-01-0004
ISSN: 1946-3979, e-ISSN: 1946-3987
Published December 01, 2023 by SAE International in United States
Effect of Two-Step Austempering Process on the Microstructure and
                    Mechanical Properties of Low-Carbon Equivalent Austempered Ductile
                    Iron
Sector:
Citation: Maddi, L., Dakre, V., Likhite, A., and Pathak, S., "Effect of Two-Step Austempering Process on the Microstructure and Mechanical Properties of Low-Carbon Equivalent Austempered Ductile Iron," SAE Int. J. Mater. Manf. 17(1):51-58, 2024, https://doi.org/10.4271/05-17-01-0004.
Language: English

Abstract:

Low-carbon equivalent austempered ductile iron (LCE-ADI) exhibits high modulus of elasticity than conventional austempered ductile iron (ADI) due to less graphite content. Austempering parameters of temperature and time significantly influence the mechanical properties of LCE-ADI. In the present work, response of the material to two-step austempering in the range of 350–450°C was studied, and a comparison was made to single-step austempering. Reduction in ferrite cell size, increase in % carbon in carbon-stabilized austenite (CSA) and increase in volume fraction of CSA led to increase in tensile strength (10%) and hardness (20%), in addition to improved toughness (10%).