α鉄の機械的性質におよぼす AIN 析出の効果

概要

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Two series of Fe-0.01, 0.03, and 0.1% Al-0.015% N alloys with either 0.01 or 0.002% C, were used to study the states of AIN precipitates and their effects on the yield point of α-iron. Results obtained are as follows. (1) AIN is mostly precipitated in the temperature range between 800 and 900℃ during isothermal after solution treatment. (2) Carbon content affects the amount, shape, size, and dispersion of AIN precipitates. (3) Variation of yield point is well explained by the individual contributions of AIN precipitates and of dissolved nitrogen. Investigation on ductility and work hardening of extra low carbon Fe-Al-0.01% N alloys with Al contents varying from 0.005 to 1% leads to the following conclusions. (4) The behavior of dissolved nitrogen as revealed by internal friction suggests that the reversion of AIN precipitation occurs. (5) In the same heat tretament that will cause the intergranular brittle fracture, ductility can be improved by fixing the more amount of nitrogen. In the ductile states, the contribution of AIN precipitates to ductility is the greater, the smaller their effect on hardening is. (6) Grain size is the main factor influencing work hardening ; nitrogen in solution or fine AIN particles increase the work hardening rate, while grown precipitates and quenched-in dislocations decrease it.
社団法人日本鉄鋼協会の論文
1969-11-01