鋼のオーステナイト結晶粒度に及ぼす鍛造, 前熱処理の影響およびオーステナイトとフェライト結晶粒度の関係

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The effects of hot forging and prior heat treatments on the austenite grain size of high purity specimens have been examined, and the relation between ferrite and austenite grain sizes before and after austenitizing has also been investigated. The results are summarized as follows. 1) When the austenite grain size of normalized Fe-C alloys is compared with those of as cast specimens and as forged specimens, a fairly good agreement is observed between these two kinds of grain sizes. 2) The effect of hot forging on the austenite grain size is studied in normalized Fe-C alloys whose forging ratios are 7 and 44. The difference in the forging ratio does not give any influence on the austenite grain size. 3) The changes in prior heat treatments e. g. normalizing, solution treatment, or precipitation treatment do not give marked differences in the austenite grain size in the case of specimens containing carbon and AlN. 4) When the specimens are austenitized below their coarsening temperatures, the austenite grain size is nearly same as that of ferrite both before and after the austenitization. 5) When the specimens are austenitized in the temperature range above their coarsening temperature their austenite grains become coarser than those of ferrite from which the austenite is formed, but their ferrite grains produced from the coarse austenite grains trend to recover their original ferrite grain size. When these coarsened ferrite grains are again austenitized in the temperature range below its coarsening temperature, the austenite grains are again refined and nearly same as the original fine ferrite grains in the size ; the ferrite grain size of the specimen thus heat treated comes back to the original fine grain size. This grain refining is more effective of the α-γ transformation than on the γ-α transformation.
社団法人日本鉄鋼協会の論文
1973-07-01

鋼のオーステナイト結晶粒度に及ぼす鍛造, 前熱処理の影響およびオーステナイトとフェライト結晶粒度の関係

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