Effect of laser irradiation on failure mechanism of TiCp reinforced titanium composite coating produced by laser cladding

Abstract

Laser cladding is an effective technique to coat a metallic substrate with a layer of a different nature. It has been widely reported that the most important combined parameters controlling the quality of the coating are the specific energy (E) and the powder density (). In the present work, clad deposits of Ti6Al4V+60%wt TiC were prepared on a Ti6Al4V substrate using an optimum combination of E c = 24 J/mm 2 and ψ c = 3 mg/mm 2. These experiments were performed using a laser power of 400 and 600 W, in order to study the effect of laser power on the properties of the clad. The microstructure, phase composition and nanohardness of the coatings were investigated by optical microscope, scanning electron microscopy and X-ray diffraction. During laser processing, TiC can be partially converted to TiC X (X = 0.5) due mainly to the TiC dissolution into the laser-generated melting pool and subsequent precipitation during cooling. It was observed that the lower laser power limit reduces primary TiC dissolution but it also promotes secondary carbide alignment at the interface. On the other hand, the damage mechanism induced by high laser power is dominated by primary TiC particle cracking by the high stress concentration at the particle-matrix interface followed by ductile failure of the matrix. It is also remarkable that irradiance affects the TiC/TiC x ratio despite E c and ψ c are fixed and it determines hardness distribution inside the coating.

A review of Additive Manufacturing technology and Cost Estimation techniques for the defence sector

“…It works with 3 main elements a steady flow powder feeder, a precision flow deposition head and 3) a LENS process control system. Candel et al (2014) observed that the most important combined parameters, related with final deposition quality are specific energy and powder density.…”

The Microstructure and Wear Resistance of a Copper Matrix Composite Layer on Copper via Nitrogen-Shielded Arc Cladding

“…Among the various surface modification methods, one method-the in situ generation of particle-reinforced composites on the surface of metal materials-has the advantage of high controllability and cost-effectiveness, making it an effective way to enhance the surface wear resistance and service life of equipment [5]. Nowadays, there are several methods of in situ generation on metal surfaces, including arc cladding [6,7], laser cladding [8][9][10][11], electron beam cladding [12,13], and plasma arc cladding [14,15]. Among these methods, arc cladding is becoming one of most promising methods as it is easy to facilitate, highly flexible, and cost-effective.…”

Mechanical properties and toughening mechanism of TiB2/NiTi reinforced titanium matrix composite coating by laser cladding

“…Particulary, the TMCs prepared by laser cladding have always exhibited great brittleness due to the large temperature gradient during laser processing [20][21][22]. Recent studies showed that [23][24][25] the distribution of reinforcement phase can solve the problem of poor plasticity, and strengthening effect can be also further improved.…”