In this present study, Tungsten Inert Gas (TIG) welding and powder filled cored wires with nitrogen shielding gas were utilized to produce TiC and TiN surface composite coatings on the titanium (Ti) sheet substrate. The TIG procedure was done at same welding parameters for all of prepared samples. Phase analysis and microstructures were done by X-ray Diffraction (XRD), Energy-Dispersive X-ray Spectroscopy (EDS), Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The obtained results from XRD and EDS demonstrated that the presence of crystalline phases of TiC, TiN and Ti. SEM and OM exhibited formation of the spherical and dendritic TiC particles in a martensitic matrix and also, TiN pinhole areas with rough and collapsed arms. Maximum microhardness value obtained was 571 HV in the case of sample treated with TiC cored wire at 95%argon+5% nitrogen atmosphere. The Pin-on-disk wear tests showed that the coating with maximum hardness had a higher wear resistance due to the presence of fine and hard TiC particles in the high-impact toughness titanium alloy with uniform distribution.

This work aimed to study the effect of various geometric parameters on bending behavior in orthopedic dynamic compression plates (DCPs) in order to achieve suitable criteria in an optimum design of these plates. Modeling, simulation, and analysis were performed through the finite element software of ABAQUS. In order to verify the model, four-point bending tests on several actual plates were conducted. In addition, the classical beam theory was applied for the theoretical estimation of the maximum tensile stress in the outer fiber and the longitudinal stresses of plates. Finite element analysis (FEA) results indicated relatively good conformity with the empirical results and those of beam theory. Based on the results, the distance of the holes from the plate edge was observed to be the most effective parameters on flexural behavior. It was also found that the flexural properties are maximized at a unique distance between the outside edge of the hole and the edge of the plate.