Changes in the Structure of the Fe-Ni-Ti-C-B Composite during Hot Plastic Deformation

The change in the structure and hardness of the Fe-Ni-Ti-C-B system composite, obtained by the method of self-propagating high-temperature synthesis (SHS), after hot plastic deformation under uniaxial compression conditions is studied. The matrix of the composite is a solid solution of Ni and Ti in a gamma-Fe crystal lattice, and the strengthening phases are TiC, TiB2, Fe2B, Ni3Ti, and NiTi. It is shown that during uniaxial compression upon heating, recrystallization processes occur in the metal matrix of the composite, which facilitates further deformation. It is found that, after compression at a temperature of 910 degrees C and a pressure of 300 MPa, the true deformation of the composite is 0.37. In this case, in the central part of the sample in the region of compressive stresses, the ratio of deformed and recrystallized grains is approximately the same. On the lateral surface of the samples, in the zone of action of tensile stresses, microcracks with a depth of less than 0.2 mm appear in zones of the eutectic gamma + Fe2B structure.