A kinetics model for temper embrittlement was employed as the basis for predicting the fracture appearance transition temperature (FATT) of 2.25Cr-1Mo steel used for hot-wall hydrofining reactors. Various heat treatments were performed to obtain different degrees of temper embrittlement for the steel. Charpy V-notch impact tests and Auger electron spectroscopy analysis were performed on embrittled 2.25Cr-1Mo steels to establish the relation between the shift of FATT and the change in the concentration of phosphorus segregated in the grain boundary of the steel. Based on the model and test data, a method of predicting the FATT at service time t was developed for the 2.25Cr-1Mo steel. Good agreement is obtained when the predicted values are compared to test data from open literature.

Issue Section:
Research Papers
Keywords:
pressure vessels, alloy steel, fracture, embrittlement, tempering, dynamic testing, Auger electron spectroscopy, segregation, grain boundaries, FATT, temper embrittlement, prediction, 2.25Cr-1Mo steel
Topics:
Embrittlement, Fracture (Materials), Fracture (Process), Grain boundaries, Steel, Augers, Electron spectroscopy, Phase transition temperature, Impact testing
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