Abstract: | AbstractThe ductile–brittle transition temperature (DBTT) of grade A48P2 steel is characterised based on the American Society of Mechanical Engineers (ASME) fracture toughness K IR curve and dynamic master curve approaches. The indexing parameter for the K IR curve, reference temperature RTNDT, is determined from drop weight and Charpy tests to be ?45°C. The dynamic master curve is constructed following ASTM standard E1921 guidelines; however, instead of precracked tests, the dynamic fracture toughness K Jd is determined from Charpy V notch tests using a modified Schindler's procedure. A Weibull plot is constructed using the K Jd data, and it is found that the points comply reasonably with the forced fit line of slope 4. The reference temperature for constructing the dynamic master curve, termed Tdy,Sch0, thus determined is ?56°C. The ASME K IR curve is shown to be conservative compared with the dynamic master curve constructed using Tdy,Sch0. |