A Metallurgical Investigation of the Effects of Double Tempering on the Hardness, Impact Toughness and Microstructure of AISI 4140 SteelPublic
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Tempering is a metallurgical process by which low alloy steels toughness & ductility are improved. Tempering is conducted in a single or multi cycle temper. The goal of this project is to investigate the effects of single vs double tempering on the properties 4140 steel. Samples of 4140 steel were tempered at 300, 400, 500, and 600 ºC for a total of 4 hours in single & double tempers. The samples were Rockwell C hardness & Charpy V-notch impact tested. The microstructure was characterized with SEM; carbides were extracted from samples & measured using XRD. The results are analyzed using the HollomanJaffe parameter. It was found that a 4-hour double temper does not significantly alter the microstructure, hardness, or impact toughness of 4140 steel when compared to a 4 hour single temper.
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