In this study, the effects of doping with the surface-active elementsGe, Te, Se, As, Sb and Sn in atomic mass contents of 10 to 200 ppm on thetexture and drawability of an IF-steel (FeP06, DIN-EN 10130) and an ELC-steel(FeP05, DIN-EN 10130) were investigated. Twenty-six ingots were produced bymelting and doping in a vacuum-induction furnace, followed by forging, hot-rolling and cold-rolling. The cold-rolling reduction was E = 72 %.Recrystallization annealing was performed in a batch-annealing simulationfurnace. Subsequently, the orientation distribution function (ODF) and the#alpha#, #gamma#, #eta#-fibre textures of both the cold-rolled and recrystallizedstate were measured by means of an X-ray diffraction goniometer and comparedwith the undoped reference material. The results indicate that the IF-steelspecimens doped with 100 ppm Te and Se show a significantly enhanced#gamma#-fibre {111}-111 } texture compared to the referencespecimen. Also the ELC-steel specimens showed a higher 7-fibre by doping withatomic mass contents of 10 to 100 ppm Se and Te. To investigate whether thedrawability has been improved, Lankford-value (r_m and #DELTA#_r)measurements by means of tensile tests were applied. The compositions withimproved #gamma#-fibre also showed higher r-values and therefore confirmedthe results of the texture measurements. Se doping was found to be especiallybeneficial in texture and drawability for both investigated materials. The growthof selenides and tellurides at the surface of Ti4C2S2- and Ti2S- precipitates wasobserved by means of scanning transmission electron microscope linescansequipped with field emission gun (STEM-FEG). Doping with Sb and Sn renderndno notable improvement of the materials, and Ge and As proved to affect themechanical properties unfavourably.
展开▼
