Testing of the method for determining the brittleness temperature range of EP718 superalloy during modeling of pulsed-arc GMA welding

Abstract

In this paper, the testing of the calculation method for determining the brittleness temperature range (BTR2) during welding of EP718 superalloy caused by diffusion-dislocation phenomena based on the numerical modeling of the thermal stage of 2-pass pulsed-arc GMA welding. The ratio of the stacking fault energy increment to the size of this range dγ/dT was chosen as a quantitative measure for assessing the probability of crack formation in the calculated brittleness temperature range. According to the results of metallographic analysis, the welded joint zones in which the occurrence of near-weld hot cracks is most likely coincide with the region of the brittleness temperature range (BTR2) calculated during the numerical modeling of the thermal stage of 2-pass pulsed-arc GMA welding in the ANSYS package.