ABSTRACT The decarburisation annealing processes of Nb-bearing grain-oriented silicon steel under different conditions were conducted. The effect of nitriding and decarburisation annealing time on the carbon content, precipitates, microstructure and texture of Nb-bearing grain-oriented silicon steel were investigated by the various analysis methods. The results show that the carbon content in the steel decreases as decarburisation time increasing, and decreases below 0.003% eventually. Larger number density and smaller size of precipitates were obtained in the sample treated by nitriding before decarburisation annealing process, leading to fine and uniform microstructure, which is beneficial to obtain excellent magnetic properties for Nb-bearing grain-oriented silicon steel. The main texture types of the experimental samples were γ-fibres with a peak at {111}<112 >. The nitriding before decarburisation annealing process makes little effect on texture evolution during decarburisation annealing process.

中文翻译：

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脱碳渗氮对含铌取向硅钢碳含量、析出物、显微组织和织构的影响

摘要 对含铌取向硅钢在不同条件下的脱碳退火工艺进行了研究。采用多种分析方法研究了渗氮脱碳退火时间对含铌取向硅钢的碳含量、析出物、显微组织和织构的影响。结果表明，钢中的碳含量随着脱碳时间的增加而降低，最终降至0.003%以下。脱碳退火前经渗氮处理的试样获得较大的数密度和较小的析出物尺寸，组织细小均匀，有利于含铌取向硅钢获得优良的磁性能。实验样品的主要织构类型是γ-纤维，峰值位于{111}<112>。脱碳退火工艺前的渗氮对脱碳退火工艺过程中织构演变的影响很小。