EFFECT OF CYCLIC PLASTIC DEFORMATION ON THE MECHANICAL PROPERTIES OF SPRING STEEL DIN 50Cr3 | ||||
The International Conference on Applied Mechanics and Mechanical Engineering | ||||
Article 20, Volume 18, 18th International Conference on Applied Mechanics and Mechanical Engineering., April 2018, Page 1-13 PDF (1.26 MB) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/amme.2018.34955 | ||||
View on SCiNiTO | ||||
Authors | ||||
O. Elzahed1, 2; M. Tolba Sallam3; K. Almazy3; M. M. Osman3 | ||||
1Egyptian Armed Forces.+ | ||||
2Corresponding author. | ||||
3Egyptian Armed Forces. | ||||
Abstract | ||||
ABSTRACT In this study the effect of cyclic plastic deformation on the mechanical properties of a light duty grade of spring steel DIN 50Cr3, commonly used in leaf spring was investigated. This steel has a chemical composition of 0.25% C, 0.8% Cr, 0.79% Mn, and 0.2% Si. Primarily, standard tensile specimens of this steel were cut and subjected to a quenching and tempering heat treatments. Austenitization was carried out at 870oC for 1h followed by quenching in oil and then tempering was applied at 450oC for 1h. Subsequently, Different pre-plastic deformation strains of 1%, 2%, and 2.5% were applied followed by various number of tensile stress cycles from zero to a maximum stress of 9%, 12.5%, and 16.5% over the offset yield stress of the quenched and tempering specimens. These plastic strains and stress cycles can simulate the possible over loading of the vehicle. By increasing the number of cycles under a constant amplitude for a given fixed pre-plastic strains, the ultimate and offset yield strength of the spring material were sensibly increased while ductility was drastically decreased. | ||||
Keywords | ||||
Spring steel; Austenitization; Quenching; tempering; Offset yield | ||||
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