doi:
UDK: 621.791.92

INFLUENCE OF LASER POWER IN DIRECT LASER DEPOSITION ON ALLOY FeCoNiCrMn

Климова-Корсмик О. Г., Коваленко Е. К., Красанов И. В., Валдайцева Е. А., Гущина М. О.
Article language: английский

Annotation

The paper considers the structure and phase compositions of a successfully obtained high-entropy alloy FeCoNiCrMn by direct laser deposition. The work is aimed at selecting the growth parameters in order to obtain bulky complex-shaped products with improved mechanical characteristics, which are possessed by high-entropy alloys. In the work, the samples obtained were investigated for the presence of defects, the chemical and phase composition of the alloy. A preliminary modeling of the phase composition of the alloy has been carried out using the Thermo-Calc software package. Modeling in the Thermo-Calc software package showed that solid solutions with a crystal lattice of the FCC type are formed in alloys of the selected composition, the type of lattice was confirmed by X-ray diffraction analysis. A division into regions with increased concentrations of elements (Fe,Co,Cr) and (Mn,Ni,Cu) was found. As the laser power increases, the microhardness decreases from 250 HV to 232 HV. Cracks were not detected in the alloy structure at the lowest value of the laser radiation power of 1.8 kW. In the remaining samples, the cracks are located in height in the center of the beads. In the cracks of the samples, the predominance of group elements (Mn,Ni,Cu) is observed. Single pores are observed in all alloys, with an increase in the laser power, the pores increase in size. The paper presents the intermediate results of the study. Keywords: high-entropy alloys, additive technologies, direct laser deposition, phase composition modeling, defects in direct laser deposition

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