鐵鋼の材質に及ぼす酸素の影響 (II)
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概要
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In the first report, expriments on the influence of oxygen on the grain size and hardenability of pure carbon steel was described in detail, that is, in pure carbon steels, grain size is influenced by the presence of oxygen, moreover, hardenability is distinctly retarded with an increase of oxygen content. However, in commercial steels, as various alloying elements are contained, it is necessary to clarify the influence of oxygen on these steels containing the third element, and then to apply the most appropriate refining method to make these steels. In this second report, the author has tried to study these infiuences on pure nickel steels containing a certain amount of carbon and various amounts of oxygen. Results obtained are as follows : 1) Pure nickel steels containing a little oxygen and much oxygen have greater tendency to form grain growth at the temperatures between 930℃ and 1050℃ than that containing medium amount of oxygen. 2) In pure nickel steels containing a little nickel and much oxygen, abnormal structure is apt to appear in the carburized samples ; however, even if nickel content increases in the steel containing much oxygen, abnormal structure is not observed. 3) Pure nickel steels containing much oxygen have distinctly lower hardenability ; however, even if nickel content increases in such steels, they become to have the same hardenability as that containing less oxygen. 4) From above mentioned facts, it is revealed that nickel neutralizes the injurious effects of oxygen in steel. On the other hand, it is said that flakes are apt to break out in nickel steels ; therefore, it is thought that the practical refining of nickel steels has to be performed chiefly to remove hydrogen, even though it causes an increase of oxygen to some extent. However, it has not yet been clarified that whether these results depend upon only the effect of oxygen content or not.
- 社団法人日本鉄鋼協会の論文
- 1951-05-25