Papers by Author: He Tong

Abstract: High-energy synchrotron diffraction offers great potential for experimental study of recrystallization kinetics. A fine experimental design to study the recrystallization mechanism of Interstitial Free (IF) steel was implemented in this work. In-situ annealing process of cold-rolled IF steel with 80% reduction was observed using high-energy X-ray diffraction. Results show that, the diffraction intensity of {001}<110> and {112}<110> belong to α-fiber texture component decreased with the annealing temperature increased while {111}<110> did nearly not change and {111}<112> increased; the FMTH decreasing and d-space changing with annealing temperature increasing indicated that the residual stress relaxed completely during recovery.

Abstract: in this paper, the texture evolution of cold rolling and recrystallization of dual phase steel sheets is studied. The experimental results show that the cold rolling texture components are γ fiber (<111>//N.D.) and α fiber (<110>//R.D.). After heat treatment (austenizing temperatures 960°C and 980°C, 0.7°C/S cooling to 650°C, a rational holding time to form ferrite and martensite microstructure), the texture components are still γ fiber and α fiber, the recrystallization texture in dual phase steel sheet is remarkable different compared to the recrystallization texture in the pure (single phase) ferrite.

Abstract: The microstructure characters of pure Iron during cold rolling were studied by HEXD (high-energy x-ray diffraction). The experimental result shows that the Debby ring of HEXD before cold rolling is discrete and very strong, the discrete diffraction points become continue and smooth with the increase of cold rolling reduction. The {001}<110> textures transform to the {001} texture after cold rolling, in this process the grains divisional are analyzed by the HEXD result.