Experimental Study on Heat Treatment of SS 420 and EN 24 Using Nanoparticulate Quenching Process

Abstract

Heat transfer through nanotechnology is a current trend which occupies most research areas with improved results. Taking this concept, the present work has been focused on the analysis of quenching effect on steel such as EN 24 and SS 420 with nanoparticles dispersed in quenching medium. Quenching is the process of removing heat from the heat-treated elements which also take part in determining the hardness values depending on the heat transfer rate and quenching time. To ensure the outcome properties, different volume concentrations of nanofluids have been prepared by adding TiO2 nanoparticles with the average diameter of less than 20[Formula: see text]nm in synthetic oil. Here, it is planned to have four volume concentrations (0.25[Formula: see text]g/lit, 0.375[Formula: see text]g/lit, 0.5[Formula: see text]g/lit, 0.625[Formula: see text]g/lit) of nanofluids to be used in the experiment. The materials after facing heat treatment up to 850∘C (EN 24) and 980∘C (SS 420), are subjected to quenching by using nanofluid. The work has been carried out by altering the tempering temperature and volume of nanoparticles in the quenching medium. The outcome quality of the product desirably supports our expectations, such as improved hardness and reduced time consumption for quenching. Additionally, the comparative analysis shows an improvement in heat transfer characteristics as well as properties in quenched specimen with nanofluids.