Numerical Simulation of Temperature Field of 12crni2 by Laser Melting Deposition

Abstract

Based on the heat transfer theory, and the fact that thermal physical parameters, latent heat of phase change and heat transfer coefficient which vary with temperature is taken into considered, a three-dimensional transient temperature field model of 12CrNi2 by Laser Melting Deposition (LMD) is established by using the parametric design language of ANSYS. Optimum process parameters were determined by single-layer and single-track experiments of LMD. Microstructure observation by optical microscope shows that the width of heat affected zone increased with the increase of laser power and decreased with the increase of printing speed. The top of the deposited layer is mainly composed of equiaxed dendrites, and the middle and bottom of the deposited layer are columnar crystals with epitaxial growth characteristics. At the same time, the accuracy and reliability of temperature field model are verified by comparing the morphology of molten pool. The simulation results show that in the process of LMD, the peak temperature of molten pool increases with the increase of layers; the peak temperature of the node increases with the increase of laser power and the decrease of printing speed. The research results in this paper would be reference for LMD of 12CrNi2 alloy steel.

Three-Jet Powder Flow and Laser–Powder Interaction in Laser Melting Deposition: Modelling Versus Experimental Correlations

“…A close correlation is observed among analytical results, numerical simulations, and experimental analysis, except the absolute mean deviation (≈10%). The possible reason for this deviation is that the material properties were considered independent of temperature change, and a point heat source was used in Figure 7 shows a comparison between the current analytical modelling with the numerical simulations of Emamian et al [34] and Duan et al [35], and experimental results of Peyre et al [36], with the emphasis on average peak temperature value, in case of LMD deposition process. A close correlation is observed among analytical results, numerical simulations, and experimental analysis, except the absolute mean deviation (≈10%).…”

“…The possible reason for this deviation is that the material properties were considered independent of temperature change, and a point heat source was used in the modelling. [35], and (c) experimental results for Ti6Al4V titanium alloy powder deposition on Ti6Al4V titanium alloy substrate [36].…”

“…It is important to note that the melt-pool characteristics play a critical role in defining the physical properties of a clad to be Figure 7. Comparison of current analytical with (a) numerical simulation for Fe-TiC depositions on the carbon steel substrate [34], (b) numerical simulation of 12Cr Ni2 alloy steel powder depositions 45 steel substrate [35], and (c) experimental results for Ti6Al4V titanium alloy powder deposition on Ti6Al4V titanium alloy substrate [36].…”

“…Table 1 collects the parameters used in computations. The numerical simulations of Emamian et al [34] and Duan et al [35] in case of the deposition of Fe-TiC on the carbon steel substrate, and of 12CrNi 2 alloy steel powder on 45 steel substrate, respectively, were selected for analysis of the accuracy of current analytical approach. The experimental data, for the deposition of Ti6Al4V titanium alloy powder on Ti6Al4V titanium alloy substrate, from the study of Peyre et al [36], was also considered.…”