低炭素鋼におけるγ→α変態域圧延効果の基礎的研究

概要

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Recovery and recrystallization behavior of ferrite during and after intercritical rolling have been investigated in low carbon steel, using laboratory mill. The results obtained are as follows : (1) Dynamic recrystallization of ferrite occurs in the intercritical rolling with such a high reduction as about 80 per cent. (2) Dynamically recovered ferrite structure formed during the intercritical rolling is very stable as compared with that formed in the rolling below Ar_1. (3) Fine ferrite-pearlite structure is obtained from austenite worked in the intercritical range. Making use of these beneficial effects of the intercritical rolling, strong and tough steel can be produced by heating at reduced temperature, followed by the rolling both in the lower temperature range of austenite and subsequent intercritical range where the fraction of transformed ferrite is less than that of non-transformed austenite. It is also necessary, for this purpose, that the rolled products are air cooled or heat treated at the temperature below Ar_1. The total rolling reduction being kept same, the properties of steel obtained by intercritical multipass rolling are nearly equivalent to those obtained by single pass rolling.
社団法人日本鉄鋼協会の論文
1979-08-01