Abstract
The fatigue properties of medium carbon low alloy forged Steels (EN 18, EN19, EN 24 and EN25) for untreated (forged) and polymer quenched samples are investigated. A dissolving temperature of 855ºC with a soaking period of 60 minutes followed by step tempering of 575ºC and 220ºC was used for the heat treatment. Thereafter quenching was performed in a polymer (polyethylene glycol 10% and 30%) separately. Fatigue tests were performed on both untreated and polymer quenched samples. The polymer quenched samples outperform the untreated samples. The fatigue analysis has been carried out using ANSYS and substantiated by the experimental results for the polymer quenched samples loaded to 30% of UTS. The heat-treated specimens had a fine-tempered martensite structure with a trace of ferrite, which enhances the toughness characteristics required for vehicles structures applications.
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