TY JOUR TI MODE INFLUENCE OF SELECTIVE LASER IMPACT UPON POROSITY OF SAMPLES OF COBALT, CHROMIUM AND MOLYBDENUM POWDERS KW laser melting KW powder material KW alloy KW modes KW porosity KW additive technologies JO Bulletin of Bryansk state technical university AU Saprykina, N.A. AU Saprykin, A.A. AU Sharkeev, Y.P. AU Ibragimov, E.A. AU Himich, M.A. PY 2021 IS 2021 PB Bryansk State Technical University