Abstract




 
   

Vol. 5, No. 1&2 (May 1992) 49-60   

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  EFFECT OF COMPOSITION ON THE RECRYSTALLIZATION BEHAVIOR OF IF STEELS DURING SIMULATED HOT STRIP ROLLING
 
 
A. Najafi -Zadeh

 Department of Materials Engineering
Isfehan University of Technology
Isfehan, Iran

J.J. Jonas

 Department of Metallurgical Engineering
McGill University, Montreal
Cana
da

 
 
 
 

Abstract    Flow curves are generated in muti-pass torsion tests for a titanium stabilized and a niobium stabilized IF steel. Two types of test schedule are used, one based on plate rolling and the other approximating strip rolling. The purpose of the former is to define the three critical temperatures of steel rolling. The strip schedules are varied in order to investigate the influence of increasing the total finishing strain (from 2.1 to 3.2) and lowering the first finishing pass temperature (from 990 to 930°C) on microstructural evolution in these steels. All the tests are carried out at a strain rate of 2s-1. Under hot strip rolling conditions, static recrystallization is responsible for the high degree of interpass softening. During the final passes, dynamic recrystallization occurs to a degree that depends on the composition of the steel, the total finishing strain and the temperature. Subjected to the same strip rolling schedule, the niobium stabilized steel has a finer ferrite grain size than the IF steel stabilized with titanium.

 
 

References   

1. Gupta, I., Porayil, T. and Shiang, L. T.,”Hot and Cold Rolled Steel Sheets” TMS-AIME, Cincinnati, Ohio, (1987), 139-152 .

2. Satoh, S.,Obara,T., Nishida, M. and T. Irie Technology of Continuously Annealed Cold Rolled Sheet Steel, TMS-AIME, Warrendale, PA, Vol. 151,(1985).

3. Gupta, I. and Bhattacharya, D.” TMS Fall meeting, Metallurgy of Vaccum-Degassed Steel Products,” Indianapolis, Indiana, Vol. 43, (1989).

4. Najafi-Zadeh, A., Bowden, J. W., Samuel, F. H. and Jonas, J. J., CIM, 29th Annual Conf. of Metallurgists,” Hamilton, Ontario, paper No. 40, Vol. 8, (August. 1990), 26-30.

5. Samuel, F. H., Yue, S. and Jonas, J. J., “ TMS Fall Meeting, Metallurgy of Vacuum-Degassed Steel Products, Indianapolis, Indiana, Vol. 395, (1989), .

6. Hashimoto, O., Satoh,S.,Irie, T.and Ohashi, N., Proc. Of the Int. Conf. on Advances in Physical Metallurgy and Applications of Steel, The Metals Society, Vol. 95, (1984).

7. Bleck, W., Bolde, R.and Haben,F. J. , TMS Fall Meeting,Metallurgy of Vacuum-Degassed Steel Products, Indianapolis, Indiana,Vol. 73, (1989).

8. Chandra, T., Yue, S., Jonas, J. J. and Ackert, R. J., Proc. 4th Int. Conf., The Science and Technology of Flat Rolling, Deauville, France, Vol. 2, No.1, (June. 1987), 18.

9. Semiatin, S. L., Lahoti, G. and Jonas, J. J., ASM Metals Handbook, 9th Ed.ASM, (1985), 154-184 .

10.Boratto, F., Barbosa, R., Yue, S. and Jonas, J. J., Proc. Int. conf. on Phys. Metall Of Termomechanical Processing of Steels and Other Metals, (Thermec 88), (1988), 383.

11. Sakai, T., Nagao, Y., Ohashi, M. and Jonas, J. J., Materials Science and Technology,Vol. 2, No. 659, (1987).

12. Samuel, F. H., Yue, S., Jonas, J. J. and Barnes, K. R., ISIJ, (1990), 30, 216.

13. Akben, M. G. and Jonas, J. J., Proc. Int. Conf. on HSLA, 3-6 Philadelphia, PA, (Oct. 1983), 149.

14. Jonas, J. J. and Sakai, T., “Deformation Processing andStructure,ASM Materials Science Seminar, ASM, Vol. 185, (1984).

15. Guthrie, R. I. L. and Jonas, J. J., “ ASM Metals Handbook, 10th. Ed., ASM”, (1989), 107-125 .

16. Tsunoyama, K., Satoh, S.,Yamazaki,Y. and Abe, H.,“TMS Fall Meeting, Metallurgy of Vacuum-Degassed Steel Products, Indianapolis”, Indiana, Vol. 127, (1989).

17. Smith, R. P., “ Trans. Met. Soc. AIME,” (1966), 236- 220 .

18. Okamoto, A. and Mizui, N., TMS Fall meeting, Metallurgy of Vaccum-Degassed Steel Products, Indianapolis, Indiana, Vol. 61, (1989).





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