Characterization of fracture behavior of a low carbon microalloyed steel for elevated temperature application

Abstract

The idea of this research was to collect data on the effect of operating temperature on the impact toughness properties of low-carbon microalloyed steel intended for elevated temperatures application. The aim of this investigation was to determine the effects of temperature as well as the effects of specimen orientation with regards to the rolling direction, on the impact toughness and the relation between its components. Charpy specimens were made from virgin material and were tested at room and operating temperature of 540 . Specimens were cut from the pipe in two directions, along the rollind direction (L-) and transverse to the rolling direction (T-). The tests were performed on an instrumented Sharpy pendulum 150/300 J, results show the total impact energy values, Etot, crack initiation energy, Ei, and crack propagation energy, Ep. The macroscopic and microscopic specimens fracture surfaces are shown. Obtainted results of impact tests energy values, correspond to the SEM micrographs of fractured surfaces.