著者
土屋 正行 泉山 昌夫 今井 勇之進
出版者
公益社団法人 日本金属学会
雑誌
日本金属学会誌 (ISSN:00214876)
巻号頁・発行日
vol.29, no.4, pp.427-433, 1965 (Released:2008-04-04)
参考文献数
24
被引用文献数
2 12

The investigation on the transformation of austenite to martensite based on the statistical thermodynamics was carried out using the iron-nitrogen binary alloys containing about 1.8 to 2.8 weight per cent nitrogen. The result of this treatment was compared with that of the iron-carbon binary alloys. The Ms point which was determined microscopically by the Greninger and Troiano method descends with the increase of the nitrogen content and attains room temperature at about 2.2 weight per cent nitrogen showing a complete austenitic structure. Ms points of the iron-nitrogen and iron-carbon alloys containing the same atomic percentage agreed with each other. The T0γ−α′ temperature (ΔFγ→α′=0) of the iron-nitrogen alloy fell nearly parallel to the change in the Ms point with increase of the nitrogen content. On the other hand, the driving force necessary for initiating the martensite transformation increased with increase of the nitrogen content. The effect of carbon on the thermodynamic properties of martensite transformation agreed with the effect of nitrogen. Stabilities of martensites and supersaturated ferrites of the nitrogen- and the carbon-iron alloys were also discussed.
著者
増本 健 奈賀 正明 今井 勇之進
出版者
公益社団法人 日本金属学会
雑誌
日本金属学会誌 (ISSN:00214876)
巻号頁・発行日
vol.34, no.2, pp.195-201, 1970 (Released:2008-04-04)
参考文献数
21
被引用文献数
1 5

Studies on the equilibrium between austenitic iron and nitrogen under various conditions of the maximum pressure of 920 kg/cm2 and the temperature range of 950°∼1300°C were carried out using a high temperature-high pressure equipment. It was shown that the concentration of nitrogen in austenite deviates from Sieverts’ law with increasing pressure. The cause for such discrepancy was considered thermodynamically and statistically. That is, the experimental result can reasonably be explained from the geometrical consideration that the chemical potential of a nitrogen atom in austenite with a high nitrogen content, departs remarkably from the value for the ideal random interstitial solid solution, since each interstitial atom added excludes other interstitial atoms from the seven adjacent sites. Thus, the activity of nitrogen in austenitic iron can be expressed by the following equations:(This article is not displayable. Please see full text pdf.)
著者
今井 勇
出版者
筑波大学比較民俗研究会
雑誌
比較民俗研究 : for Asian folklore studies (ISSN:09157468)
巻号頁・発行日
no.18, pp.112-121, 2002-11-30

明治以降、日本は対外戦争での勝利により植民地を領有する国家となった。植民地の獲得は、日本に統治区域の一部でありながら異民族の居住する地域を支配しなけらばならないという問題を突きつけ、以後敗戦に至るまで、偽政者は異民族支配の問題に頭を悩ませ続けることになる。・・・