Mo 鋼の強度におよぼす Ti 添加の影響について

概要

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The effect of Ti addition on the hardenability and strength of Mo steel was studied. The results are as follows ; (1) Mo-Ti steel shows nearly the same hardenability as the Mo steel of the same Mo content, but the tempered hardness of Mo-Ti steel is higher than that of Mo steel. This means that Ti addition is effective in delaying softening of Mo steel. (2) Mo steel shows nearly constant tempered strength independent of the quenching temperature, but the tempered strength of Mo-Ti steel incresses with increasing quenching temperature. (3) The increase of the strength of Mo-Ti steel owing to the increase of quenching temperature from 900℃ to 1250℃ depends on the Ti content, whereas the increase of the strength between 900℃ and 1000℃ is independent on Ti content. From these results, it can be clarified that about 50% of total Ti content is effective in increasing strength. (4) The strength of Mo-Ti steel shows, as mentioned above, a strong dependence on quenching temperature and has a particular correspondence to the residue analysis. These facts suggest that the delayed softening of Mo-Ti steel can be ascribed to the small amount of Ti soluble at temperatures lower than 1000℃.
社団法人日本鉄鋼協会の論文
1969-08-01