Study on Evolution Laws of Microstructure and Texture in Whole Process of Low Temperature Hi-B Steel
In this paper,the continuous casting billet of low temperature Hi-B steel,metallographic structure and texture of plates after such processes as hot rolling,normalizing,cold rolling,decarburizing annealing and high temperature annealing are observed with metallographic microscope and X-ray diffractometer(XRD)as well as the evolution laws of microstructure and texture in the whole process are analyzed.The results showed that the macrostructure of continuous cast-ing billet was mainly columnar crystal and proportion of equiaxed crystal zone was 7%～12%;microstructure of hot rolled plate was composed of alternant banded structure of ferrite and pearlite;microstructure of normalized pickled plate was com-posed of fine crystal zone and recrystal microstructure.The textures at 1/8 of thickness of hot rolled plate and normalized plate are mainly Goss texture and brass texture as well as strong Goss texture is formed with the secondary recrystallization after high temperature annealing.
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