Influence of roughing rolling passes on kinetics of strain induced precipitation of Nb(C,N)

Abstract

AbstractThe effects of reheating temperature and of the strain and temperature of roughing deformation passes on the kinetics of strain induced precipitation after a finishing deformation pass have been investigated for several niobium high strength low alloy (HSLA) steels. Strain induced precipitation was detected via its strengthening effect on a second finishing deformation carried out either by experimental rolling or by plane strain compression tests. Precipitates were also observed using thin foil electron microscopy. Decreasing reheating/roughing temperature and increasing roughing strain were found to significantly accelerate precipitation – this acceleration is attributed to clustering of niobium in solution.MST/1409