厚鋼板の強度・靱性におよぼす変態域圧延法の効果

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The intercritical rolling method has been applied to the manufacture of strong and tough steel plate. The results obtained are as follows : (1) An excellent combination of strength and notch toughness can be achieved by increasing rolling reduction in the intercritical range. Notch toughness and arrestability of brittle crack propagation are much improved also by the intercritical rolling of Nb bearing steel with fine austenite grains. (2) The main characteristic of the intercritically rolled plate is the decrease of variation of mechanical properties both within a single plate and throughout simularly rolled plates due to temperature equalization and work hardening mitigated by the recovery of the worked ferrite, which in turn is due to heavy rolling reduction in the intercritical range. A further result is the stability of the manufacturing conditions. (3) In addition to its well ballanced strength and notch toughness, the intercritically rolled plate with low carbon equivalent excels or matches the plate subjected to heat treatment in fracture properties, various kinds of workability and weldability. Through the application of intercrtical rolling to various types of mills, the optimal rolling conditions for strength and notch toughness have been found to differ according to the various rolling mill characteristics ; whereas the most effective condition for a hot-strip mill is rolling with a few passes within a highertemperature intercrtical range, rolling with higher total reduction with many passes within a lower-temperature range is appropriate for a plate mill.
社団法人日本鉄鋼協会の論文
1981-03-01

厚鋼板の強度・靱性におよぼす変態域圧延法の効果

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