The     second    phase    particles    in     simulated    weld(H08C    weld    wire-0.06C

1.44Mn

0.24Mo

0.04Ti

  0.01V)and     coarse     grained     heat     affected     zone(CGHAZ)of     Ti-V-Nb     microalloyed     steel(0.08C

1.29Mn

0.02Ti

0.04V

0.04Nb)have  been  studied  by  using  carbon  extraction  replica  technique.Results  showed  that  size  of  most  second phase particles in parent metal was ≤30 nm with average  size  19.70 nm; there was a lot of residual carbo-nitride particles in CGHAZ of which the average size increased to42.78 nm

and the shape of residual particles changed from irregular morphology in parent metal to cubic in CGHAZ in which the Ti content obviously increased; and most of carbo-nitride particles in weld dissolved

the TiO formed in bath combined with other deoxidising and desulphurizing products to form large scale inclusions  and  the  inclusions  and  second particles  containing Nb

V  didn't  find  out  in  weld.