| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 100 === This study mainly investigated that using hot band decarburization annealled time process of 2mins& 5mins to observe the microstructure and texture differences to check the differences of the grain size after primary recrystallization annealing. With the decarbonization process and nitriding process to explore the variation in thickness of the oxide precipitates size and distribution,and to view its follow-up processes.
Secondary recrystallization annealing macroscopic organization and the theory of grain growth situation as compared to identify a suitable grain size and permeability of nitrogen. Using the above analysis methods and annealing processes to deal with different hot band annealing process .the nitriding process to explore the secondary recrystallization behaviors and the effect of the magnetic properties.
By observating hot band decarburization annealing at different times, I found that the lamellar structure of the hot band and the average distance between time recrystallization annealing temperature for primary recrystallization grain size have a great impact. Furthermore, the primary recrystallization annealing of decarbonization time changes in the different view of the variation in thickness of the oxide layer and its follow-up process , after which the precipitate size and distribution of different nitriding processes observed and found to 540ppm the infiltration nitrogen for the final magnetic propertieshave a great impact with the core loss.
Finally, in this study the best experimental condition, hot-band decarburization annealed 5 minutes after the primary recrystallization decarburization annealing 750℃、5 minutes,the nitridation 750℃、20 seconds、1.7(L/min),annealing recrystallization front by the second temperature 995℃,holding temperature for 12 hours to achieve the best experimental value of flux density and iron loss.
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