PSI - Issue 36

Olexandr Ivanov et al. / Procedia Structural Integrity 36 (2022) 223–230 Olexandr Ivanov et al. / Structural Integrity Procedia 00 (2021) 000 – 000

227

5

energy of a multicomponent system as:

2 2 . G с T T  = − 

( 5)

For the experimental material (table 1), calculated temperature dependence of the specific heat is shown in Fig. 3.

Fig. 3. Temperature dependence of specific heat for experimental electrode material.

Calculations of temperature dependences of thermal conductivity and thermal density were performed using JMatPro software. The results are shown in the Fig. 4.

Fig. 4. Temperature dependences of (a) thermal conductivity; (b) thermal density for experimental electrode material.

Analysis of the obtained temperature dependences of thermophysical characteristics shows that heating to ⁓ 1000 K there is an almost linear increase in heat capacity and decrease in density. Thus, the values of thermal conductivity are described by a curve with a weak maximum at ⁓ 500 K. A further increase in temperature from 1000 K to the temperature of the liquid phase 1400 K is accompanied by an increase in thermal conductivity and a decrease in density in dependences close to linear, and the values of thermal conductivity are a t 0.75 J/g·K. At the temperatures above 1400 K, invariant transformations occur which cause a series of peaks on the specific heat curve, while the dependences of thermal conductivity and density show a gradual increase and decrease, respectively. For calculation of the thermal conductivity coefficient, the average values of all calculated thermophysical characteristics from the temperature range 300 - 2400 K were selected: λ = 30.09, W/m°С; c = 1.23, J/g·K; ρ = 7.08, g/cm 3 . The power of the arc was q = 3200 J, and the deposition rate of 0.15 cm/s. Experimental verification of theoretical calculations was performed by comparing the values of the thermal cycle calculated using equation 1 with replacing of the variable x with - vτ, where τ is the time and value s measured using thermocouples drilled in a steel plate on which was welded at a distance of 0.5 cm from deposited layer (Fig. 5).