INFLUENCE OF CARBON ON DISCONTINUOUS PRECIPITATION IN CO-32 MASS-PERCENT-W ALLOY

The hypothesis that during the discontinuous precipitation process (DP ) carbon in the cobalt-tungsten alloy interacts with tungsten atoms in the diffusion process at the moving cell boundary (CB) has been prove d by means of experimental evidence and calculations. The change of th e diffusivity at CB has also been estimated in a wide range of tempera tures for the alloys with and without carbon. An increase of the activ ation energy of diffusion has been observed in the DP process in the a lloy with the carbon addition. A method of estimation of carbon amount s in the DP products has been proposed for the cases in which the expe rimental analysis of composition is impossible to carry out.