期刊
STEEL RESEARCH INTERNATIONAL
卷 87, 期 11, 页码 1417-1425出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.201500423
关键词
grain oriented silicon steel; continuous annealing; secondary recrystallization; magnetic property
资金
- National High Technology Research and Development Program of China [2012 AA03A505]
Low-cost grain oriented silicon steel produced by continuous annealing, low slab-heating temperature, and omitting normalization annealing is explored and analyzed. This type of grain oriented steel is designed to replace the non-oriented steels used for the production of transformers of medium and small sizes as specified in all GO steel producers catalogs. Fully secondarily recrystallized structure with magnetic properties of P1.7 = 2.04 Wkg(-1) and B8 = 1.76 T is obtained at temperature of 1050 degrees C within 10 min in the condition of two-stage cold rolling, whereas one-stage cold rolling method fails to initiate abnormal grain growth in the same processing parameters. The success of fully secondary recrystallization using two-stage cold rolling method is ascribed to the more important role of sufficient amount of Goss seeds in decarburized samples as in CGO steels than the stronger {111}<112> texture as in HiB silicon steels. It is further determined that by two-stage cold rolling technique, a higher secondary stage rolling reduction leads to a lower secondary recrystallization starting temperature and a shorter secondary recrystallization staring time related with a finer grain size. The reasons for the high iron core loss related by continuous annealing are connected to the higher number of deviated Goss grains scattering toward {210}<001> or Brass orientations, the residual inhibitors and the imperfect grain size and morphologies. The reasons for the failure in abnormal grain growth by one-stage rolling are also discussed.
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