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Adetunji, Olajide R. and Adegbola, A.O and Afolalu, Sunday A. (2015) COMPARATIVE STUDY OF CASE-HARDENING AND WATER-QUENCHING OF MILD STEEL ROD ON ITS MECHANICAL PROPERTIES. International Journal of Advance Research, IJOAR .org, 3 (6). pp. 1-9. ISSN 2320-9135

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Mild steel is easily available and affordable having all material properties that are acceptable for many applications. It has carbon content up to 0.15%. While case-hardening and water-quenching are carried out on mild steel to improve toughness, strength and hardness, ductility declines as a result of internal stress developed in the material. This research work evaluated the effect of case-hardening and water-quenching on the mechanical properties of mild steel rod. Fifteen samples of mild steel rod of diameter 50 mm were prepared and heat treated in all, 12 of which were tensile samples. The other materials used for the project work were; powdered charcoal (4.44 g), barium carbonate (250 g), venier caliper, optical microscope, heating furnace and the material testing equipment. The water quenched specimens were heated to 950 oC and soaked for 40 minutes, after which the specimens were quenched in water. The case-hardened specimens were heated to 950 oC and for a period of 40 minutes and then quenched in salt solution. Various tests were carried out on the heated samples such as; tensile strength test, hardness test, microstructural analysis and chemical analysis were all carried out. The results showed that the case-hardened specimens had more ductility than the water-quenched. The hardness test revealed that the water-quenched samples were the hardest, followed by the case-hardened samples. The case-hardened specimens had higher value than water-quenched specimens for strain at break. Various microstructures which were product of austenite were got such as, martensite (BCT, fine grains), Bainites and Pearlites

Item Type: Article
Uncontrolled Keywords: Hardening, Mild Steel, Carburization, Quenching, Nitriding, Analysis.
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 16 Aug 2018 09:04
Last Modified: 16 Aug 2018 09:04

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