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

International Conference on Recent Advances in Materials & Manufacturing Technologies

Sethuram, D.^1 ; Srisailam, Shravani^1 ; Ponangi, Babu Rao^2

Department of Mechanical Engineering, PES University, 100 feet ring road, BSK III Stage, Bangalore

560085, India^1

Department of Post Graduate Studies, Mechanical Engineering, PES University, 100 feet ring road, BSK III Stage, Bangalore

560085, India^2

关键词: Austempered ductile irons;    Austempering;    Austempering process;    Corrosion and wears;    Corrosion behaviour;    Corrosive resistances;    Heat treatment process;    Microstructural features;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/346/1/012035/pdf
DOI  :  10.1088/1757-899X/346/1/012035

来源: IOP

【 摘 要 】

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.