Issue 50

L. Romanin et al., Frattura ed Integrità Strutturale, 50 (2019) 251-263; DOI: 10.3221/IGF-ESIS.50.21 257 Figure 7: Precipitates and Mo segregation in FZ. Figure 8: Microhardness profiles N UMERICAL MODEL non-linear thermal transient analysis of the electron beam welding process has been performed. The fast motion and the extremely high power concentration of the heat source cause severe temperature gradients and heating/cooling rates which have to be captured by a fine mesh and a small time-step. Taking advantage of geometrical and load symmetry, only one plate has been modelled. A time step of 0.05 s was set during the passage of the heat source over the piece. A