MECHANICAL TENSILE PROPERTIES OF X12CRNITI-18-10 STEEL, OBTAINED BY THE METHOD OF SELECTIVE LASER MELTING
The problems of experimental investigation of mechanical behavior of steel X12CrNiTi-18-10 obtained by the selective laser melting method of powder with particle sizes from 10 to 63 microns are considered. Steel X12CrNiTi-18-10 mechanical properties were determined by tensile tests of solid cylindrical specimens grown in vertical and horizontal directions. Sample blanks were grown on the Concept Laser M2 CUSING 400 W industrial 3D printing system, was machined afterwards. The experiments were conducted on Instron 8801 specialized testing system at the PNRPU Experimental Mechanics Center. To measure deformations, an Instron 2620-603 dynamic axial extensometer was used. New results of tensile testing of stainless steel X12CrNiTi-18-10 are given. It is shown for samples grown in layers in the horizontal direction all the mechanical properties are significantly higher in magnitude than for samples grown in the horizontal direction. According to the results of a series of tensile tests, the mechanical characteristics of the samples were compared without heat treatment and with heat treatment. It is shown the heat-treated samples have the strength and conditional yield strength values significantly lower the Young's modulus and the transverse taper coefficient are slightly higher, and the coefficient of relative elongation is significantly higher compared to the values of similar mechanical properties of the samples that have not been heat treated.