EFFECT OF QUENCHING MEDIA ON MECHANICAL PROPERTIES OF MEDIUM CARBON STEEL
Abstract
ABSTRACT
This study investigates the effect of quenching media, engine oil, water, and brine on the mechanical properties of medium carbon steel. Samples were heat-treated and quenched in each medium, followed by mechanical testing. The results revealed significant variations:
Brine quenching produced the highest hardness (91.03 HRA) and tensile strength (780.20 MPa) but the lowest impact energy (35 J) and ductility (6% elongation), indicating a trade-off between strength and toughness.
Water quenching achieved a balance, with high hardness (89.25 HRA), improved tensile strength (700.34 MPa), and moderate impact energy (45 J).
Oil quenching offered lower hardness (85.75 HRA) than brine or water but retained better toughness (50 J impact energy) and ductility (12% elongation), making it suitable for applications requiring crack resistance.
Compared to the untreated control sample (84.93 HRA, 560.67 MPa UTS), all quenching methods enhanced hardness and strength, albeit at the expense of reduced elongation. These findings demonstrate that quenching media selection critically influences the mechanical performance of medium carbon steel, with brine favoring high-strength applications, water providing a balanced profile, and oil prioritizing toughness. The results guide material selection for industries such as automotive and construction, where tailored properties are essential.
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