Investigation on the Interrelationship between the Chemical Composition, Heat Treatment Parameters and the Phase Transformation Process, Microstructure Evolution and the Mechanical Properties of Austempered Steel
نویسندگان
چکیده
The interrelationship between chemical composition, heat treatment parameters, and phase transformation, microstructural evolution the mechanical properties of austempered steel was studied. Two samples with different percentage composition carbon 0.56 0.76 were used for study. They austentized at respective temperatures 8000C, 8400C, 9000C 9600C 30 minutes. thereafter quenched using bitumen-palm kernel oil, subjected to austempering isothermal 4200Cfor time durations 5, 15, 30, 45 60 tested tensile strength, elongation, hardness impact strength. also characterization determine phases in microstructures their effects on developed materials. Results obtained revealed that dominant microstructure bainite, matensite traces retained austenite. It found decreasing austenitizing temperature yields finer grain structures increase strength elongation decrease relatively little effect At any given temperature, shorter holding yielded optimum while higher values associated time. These results proved process conditions have strong correlation both properties. concluded most promising respect excellent strength-ductility property are those ausenitizing range 800 -8400C 5 – materials potential load bearing application austenitized within 900 - 15 minutes candidate material wear resistant application.
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ژورنال
عنوان ژورنال: European journal of mechanical engineering research
سال: 2022
ISSN: ['2055-6551', '2055-656X']
DOI: https://doi.org/10.37745/ejmer.2014/vol9n2112