Precipitation of Aluminium Nitride during Recrystallization of α-Iron

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An investigation has been made on the precipitation of A1N in vacuum melted iron wires containing 0.003, 0.036, and 0.072 wt% Al, solution-treated at 1200℃, cold-reduced to 70%, and isothermally annealed in the range 500°to 700℃. The behaviour of A1N in α-iron during annealing was followed by low frequency internal friction measurement. By separating the observed Snoek peaks into those of carbon and nitrogen, the amounts of carbon and nitrogen dissolved in solution were determined. The results obtained were summarized as follows : (1) In Fe-0.003 wt% Al, nitrided or carburized prior to the solution-treatment, the amount of dissolved nitrogen was increased during isothermal annealing at 600℃ after cold reduction, whereas the amount of dissolved carbon decreased to the solubility limit. (2) Some difference was seen in the process of A1N precipitation during isothermal annealing between Fe-0.036 wt% Al-0.006 wt% N, in which the A1N particles were completely dissolved by a solution-treatment at 1200℃, and Fe-0.072 wt% Al-0.028 wt% N, in which some of the A1N particles remained undissolved. A1N precipitation in both cases occurred during the recovery and in the early stage of recrystallization at 600℃, and the recrystallization was retarded. (3) In Fe-0.072 wt% Al-0.028 wt% N annealed at 700℃, the recrystallization was completed before A1N precipitation started. However, a preheat-treatment of for 20 hr at 500℃ given prior to 700℃ annealing did significantly affect the recrystallization process by promoting A1N precipitation and decreasing the recrystallization rate.
東北大学の論文

Precipitation of Aluminium Nitride during Recrystallization of α-Iron

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