Sliding wear and corrosion behaviour of alloyed austempered ductile iron subjected to novel two step austempering treatment

Austempered Ductile Iron(ADI) is an exciting alloy of iron which offers the design engineers the best combination high strength-to-weight ratio, low cost design flexibility, good toughness, wear resistance along with fatigue strength. The two step austempering procedure helps in simultaneously impro...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-04, Vol.346 (1), p.12035
Main Authors: Sethuram, D., Srisailam, Shravani, Ponangi, Babu Rao
Format: Article
Language:English
Subjects:
Alloying
Austempered nodular iron
Corrosion
Corrosion resistance
Corrosion resistant alloys
Corrosive wear
Fatigue strength
Ferrous alloys
Frictional wear
Heat treating
Heat treatment
Literature reviews
Permanent moulded austempered ductile iron
Process variables
Sliding friction
Strength to weight ratio
Sulfuric acid
Tensile strength
Two step austempering
Wear resistance
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Summary:Austempered Ductile Iron(ADI) is an exciting alloy of iron which offers the design engineers the best combination high strength-to-weight ratio, low cost design flexibility, good toughness, wear resistance along with fatigue strength. The two step austempering procedure helps in simultaneously improving the tensile strength as-well as the ductility to more than that of the conventional austempering process. Extensive literature survey reveals that it's mechanical and wear behaviour are dependent on heat treatment and alloy additions. Current work focuses on characterizing the two-step ADI samples (TSADI) developed by novel heat treatment process for resistance to corrosion and wear. The samples of Ductile Iron were austempered by the two-Step Austempering process at temperatures 300°C to 450°C in the steps of 50°C.Temperaturesare gradually increased at the rate of 14°C/Hour. In acidic medium (H2SO4), the austempered samples showed better corrosive resistance compared to conventional ductile iron. It has been observed from the wear studies that TSADI sample at 350°C is showing better wear resistance compared to ductile iron. The results are discussed in terms of fractographs, process variables and microstructural features of TSADI samples.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/346/1/012035