THE EFFECTS OF QUENCHING MEDIA ON THE MICRO-STRUCTURAL, HARDNESS AND IMPACT PROPERTIES OF MEDIUM CARBON STEEL

The effect of quenching media on the micro-structural, hardness and impact properties of medium carbon steel has been studied using air, water and engine oil as quenchants. Mild steel was chemically analyzed and observed (micro-structure) as received and when quenched in the respective media. These were carefully subjected to hardness and impact tests accordingly with a view to ascertain its hardness and impact strength. The mild steel had higher hardness of 260 BHN in water and higher impact strength of 86.56 J in engine oil. The mild steel is identified as medium carbon stee