Effects of heat treatment process on microstructure and iron loss of 0.25% Si non-oriented silicon steel sheets containing niobium

Zhang Wenyue; Zhang Feng

doi:10.7513/j.issn.1004-7638.2021.01.027

Volume 42 Issue 1

Feb. 2021

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Zhang Wenyue, Zhang Feng. Effects of heat treatment process on microstructure and iron loss of 0.25% Si non-oriented silicon steel sheets containing niobium[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 164-169. doi: 10.7513/j.issn.1004-7638.2021.01.027

Citation:

Zhang Wenyue, Zhang Feng. Effects of heat treatment process on microstructure and iron loss of 0.25% Si non-oriented silicon steel sheets containing niobium[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 164-169. doi: 10.7513/j.issn.1004-7638.2021.01.027

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Effects of heat treatment process on microstructure and iron loss of 0.25% Si non-oriented silicon steel sheets containing niobium

doi: 10.7513/j.issn.1004-7638.2021.01.027

Zhang Wenyue,
Zhang Feng^,

Central Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China

Received Date: 2020-04-16
Publish Date: 2021-02-10

Abstract

Abstract

The microstructure and mechanical properties can be greatly improved by adding proper niobium concentration in liquid steel, but the magnetic properties will sharply decrease as the increase of niobium concentration in non-oriented silicon steel sheets. So far, the formation state and effect mechanism of niobium element as well as its influence on the change of magnetic properties under different hot treatment technology are yet to clarify. In present work, the formation type of the Nb- containing inclusion and its negative effect was discussed based on 0.25% Si non-oriented silicon steel sheets containing niobium. It is expected that the proper heat treatment techniques can be used to decrease the harmful effect of the magnetic properties by niobium element. The results showed that, there is multiple harmful inclusions with hundreds of nanoscale in size, that can pin grain boundary and decrease grain boundary diffusion rate, and retard the started temperature and the finished temperature of recrystallization of the cold rolled steel sheets. Thus, the grain size will be refined and the iron loss will be poor. As the increase of niobium concentration, the eddy loss will be stable and the hysteresis loss will be increase, respectively. The suitable heat treatment techniques can improve the grain size after stress release annealing, and decrease the deviation of hysteresis loss for the different niobium concentrations as possible.
- non-oriented silicon steel sheets,
- niobium element,
- heat treatment,
- microstructure,
- iron loss

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References(15)

References

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