Abstract
This paper presents two methods to predict the fracture toughness KIC transition curve of low alloy steels using Charpy V-notch impact test results and tensile properties. One is the method using a single master curve of the KIC/KIC-US versus excess temperature relationship of each material where KIC-US is the upper shelf fracture toughness and the excess temperature is a test temperature minus FATT. Another method is the one using a KIC/KIC-US versus T-T0 master curve and the temperature shift ΔT between lower shelf fracture toughness KIC-LS and Charpy impact transition curves, where To is the temperature showing 50 percent of KIC-US of the material.
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