چكيده به لاتين
In this study, deformation behavior and damage evaluation of a new 〖TiB〗_2 steel-based composite have benn considered using in situ three-point bending test. In this regards, deformation and the amount of damage occurred on the composite was determined. Inhomogeneous distribution and various particle size exists in different zones of the product. Furthermore, in different zones of the rolled sample, orientation of non-spherical disordered particles is in this way that the large length of the particles are in rolling direction. So for investigating the effect of particle size, distribution and the orientation of the particles on bending, in three different direction respect to rolling direction, some samples provided for doing in-situ three point bending test. Before bending test, the microstructure have been characterized and by launching bending test, crack propagation and the amount of damage occurred on the reinforced particles are also characterized. The results from physical characteristic of particles shows the renge of particles size is 1 - 2.6 um in which it shows the variety of particle size and also area fraction of them (10±1%). Also, different features in longitudinal and transverse direction resulted in homogeneous ad inhomogeneous zones in the material that affected the mechanical behavior of this composite. In transverse direction, two different behavior observed. One of them was high strength due to the homogeneous distribution of particles and the other was the increasing in ductility and the 50% decrease in strength because of inhomogeneous distribution of particles and also crack propagation in matrix. In longitudinal direction, by increasing in ductility, because of homogeneous distribution of particles, relatively acceptable strength observed. Microstructure parameters that affected the mechanical behavior are aso play their role on the amount of damage occurred on the particles that cause different crack propagation in each direction. In longitudinal direction, because of the same direction between particles and the loading direction, the amount of damage was high. In transverse direction in some cases because of high strength small particles, the amount of damage was low and in other cases, the amount of damage was low as matrix deformation occurred in the composite.
