The nucleation and growth of widmannstätten m23c6 precipitation in an austenitic stainless steel

摘要: Abstract A 24% Ni, 25% Cr austenitic stainless steel containing 0.03% C has been quenched from 1150°C. and aged at 650°C 750°C. for periods up to 2500 hr. M 23 6 carbide precipitation occurs upon dislocations also as random dot-like particles which show matrix strain contrast. Denuded grainboundary regions suggest that vacancies play a significant role in the formation of particles. The lose coherency they grow, forming Widmannstatten precipitate needles lying along 〈110〉. precipitates are parallel orientation with matrix, bounded by two conjugate sets {111} interface planes contained their growth direction. Their habit is accounted good atomic correspondence relevant directions austenite lattices.