Predicting of Sn11Sb5.5Cu babbitt fracture using computer simulation at equal-channel angular extrusion

摘要

Te severe plastic deformation (SPD) methods are widely used to form ultrafne-grained structure in metals and alloys. Teylead to a signifcant change in the physical and mechanical properties of materials. Since large deformations are accumulatedduring SPD the material loses its ability to deform and begins to break down. Te purpose of this work was to predict thefracture of Sn11Sb5.5Cu babbitt with a di?erent microstructure at equal-channel angular pressing (ECAP) based on the fniteelement modeling. Te tin babbit (11%Sb, 5.5%Cu, Sn the rest, weight %), obtained by conventional casting with a di?erentcrystallization rate was chosen for study. Te increase of crystallization rate led to the formation of a structure with smallerand uniformly distributed intermetallic particles. Te equipment for ECAP consists of a matrix with vertical and horizontalchannels crossed at angle 90° and a punch located in the vertical channel. ECAP was conducted at ambient temperature, a rodof square cross-section 9.7 × 9.7 mm and a length of 60.0 mm was deformed. Te transfer speed of the punch was 1 mm/min.Computer modeling was performed using the DEFORM?2D sofware package. A model of the above described equipmentand the sample was built. Te comparison of computer simulation data and natural experiment was performed. It is shownthat the metal damage calculated by the Cockrof-Latham method, installed in the DEFORM?2D, makes it possible to predictthe failure of the babbitt Sn11Sb5.5Cu samples with di?erent structures at ECAP.