3D Transient Thermal Modelling and Experimental Validation of the Temperature Distribution during Laser Heating of Ti6Al4V Alloy

Abstract

Abstract.A three 3D transient finite element model has been developed to predict the temperature distribution in Ti6Al4V alloy plate workpiece. It is found that the temperature profile is strongly dependent on the parameters of the laser beam and material properties. Also the thermal model results were compared with results produced by experimental work and these show close agreement.

Analysis of the Advantages of Laser Processing of Aerospace Materials Using Diffractive Optics

“…The use of diffractive optics for laser beam shaping provides us with an opportunity to obtain specified properties of processed materials. Investigations of the thermal state of the surface layers of materials subjected to laser irradiation, carried out in [55][56][57][58][59]64], showed that the characteristics of the temperature field in materials (i.e., the magnitude and gradient of temperatures and the rate of heating and cooling) are largely influenced by the energy parameters of the irradiation, the movement speed of the energy source, the nature of the power distribution in the beam, the thermophysical characteristics, and the geometric dimensions of the processed material. The temperature gradient in the surface layer under laser irradiation on large parts is high, reaching the value of 10 8 -10 9 K/m, and gradually decreases from the surface into the depth of the material [106].…”

“…The study of thermal processes allows us to identify common relations and the main areas for the improvement of processes to initiate concentrated energy flows. Lasers' effects on opaque materials in a wide range of power densities, of up to 10 13 W/m 2 , are satisfactorily described by the thermal model [56,57]. Material properties depend on the thermal state.…”