- 著者
-
嘉村 平八
- 出版者
- 一般社団法人 日本鉄鋼協会
- 雑誌
- 鐵と鋼 (ISSN:00211575)
- 巻号頁・発行日
- vol.21, no.8, pp.643-655, 1935
The author has been published on the effects of phosphorus as to the mechanical and physical properties of iron on this journal, Vol. XVIII, No. 4. This is the contuniation. of the previous investigation. It has been known that the magnetic properties of the iron is remarkably effected by small amount of impurities in it and the superior magnetic properties is obtained to eilminate the impurities as lower as possible in its manufacture.<BR>The author incidently discovered, in an occasion of investigation of iron made by the process of hydrogen reduction, that the phosphorus in the iron improves the magnetic properties of iron-that is high permeability and low hysteresis loss.<BR>In this research, the magnetic properties of phosphor iron, containing lower than 1% P was investigated. When the amount of phosphorus in the iron is about 0·7% the maximum permeability reached to 20, 000 and the hysteresis loss decreased to less than 1, 000 ergs. per sq. cm. per cycle; that is nearly correspond to three times in the maximum permeability and 60% in the hysteresis loss compared with the 3·5% silicon-steel in the market. When the phosphorus content is more than 0·5%, no ageing phenomena was obserbed. It was recognized that the proper annealing temperature exist by different phosphorus content to obtain best magnetic properties. In the investigation of the microscopic structure, the higher the phosphorus content in the iron the larger grain size was to be seen as in case of the silicon-steel, but it is not much remarkable when the phosphorus content reaches to more than 0·5%. When the annealing temperature is raised to the recrystalized range which is seen from the constitutional diagram of Fe-P, the deleterious effects on the magnetic properties was observed.