Mechanical properties of NiCrBSi self-fluxing alloy after LPBF with additional heating

The study was devoted to a detailed experimental study of the implementation conditions of the laser powder bed fusion (LPBF) process of special-purpose products from self-fluxing powdered high-temperature NiCrBSi composite. Optimal regimes of LPBF for the 3D part of the simplest shape were experimentally determined. We recommended laser power P =100 W, the laser scanning velocity is v = 10 cm / s, the beam diameter is 70 μm, process gone in argon. Additional efforts were made to evaluate the effect of additional heating the base platform up to 500 °C. Optical and scanning electron microscopy, the X-ray diffraction analysis and EDS microanalysis were used for describing the sequence of structure formation in the created 3D samples. We conducted mechanical and tribological testing allowed to evaluate the relationship between the laser PBF parameters and data on linear wear, roughness, fracture rupture for 3D from NiCrBSi superalloy after the laser PBF process. Possible causes of increase crack formation during the LPBF of the NiCrBSi powder system are considered and revealed.