Prediction of Microstructure Development During Recrystallization Hot Rolling of Ti-V Steels
Abstract:
In recrystallization hot rolling of plate, the static recrystallization of austenite at moderate rolling temperatures is used to engender fine as-hot-rolled ferrite grain sizes and concomitantly attractive as-rolled properties. The advantages of the procedure in comparison with controlled rolling are shorter throughput times on conventional mills and lower rolling loads. In the present paper, the essence of a computer model for predicting microstructural evolution during recrystallization hot rolling of a Ti-V microalloyed steel is given. The model is shown to forecast a behaviour which is in acceptable accord with practical rolling experience. Furthermore, the effect of the principal rolling variables on the degree of microstructural refinement during processing via recrystallization rolling has been investigated theoretically in a systematic way. Low finish-rolling temperatures and heavy reductions, especially during the final passes, promote fine as-rolled ferrite grain sizes; the austenite grain size created during reheating has no bearing on the final as rolled microstructure. In addition, a suggestion is given regarding the design of rolling schedules which fulfill the conflicting requirements of efficient microstructural refinement (large reductions in the final rolling passes) and satisfactory plate flatness (small reductions)
Keywords:
vanadium, recrystallization, hot rolling.
Author:
W. Roberts (1), A. Sandberg (1), T. Siwecki (1) and T. Werlefors (2)
Affiiation
(1) Institute för Metallforskning, S-114 28 Stockholm, Sweden.
(2) Svenskt Stål AB, S-613 01 Oxelösund, Sweden.
PDF:
Source:
Vanadium Structural Steels - Reprint of papers on vanadium steel from the proceedings of “ASM HSLA Steels Technology and Applications Conference, Philadelphia, USA, Oct., 1983, pp.35-52
PDF Preview:
