Effect of Reheating and End Cooling Temperature on Microstructure Refinement in a Low Carbon High Strength Nb-Ti Microalloyed Dual Phase Steel

Abstract:

Article Preview

In this study, a TMCP was attempted to obtain a low carbon high strength Nb-Ti microalloyed dual phase with low yield ratio at Baosteel. Optical and scanning electron microscopy was utilized to analyze microstructures. A mixed fine microstructures consisting of acicular ferrite and martensite/austenite was observed. The austenite maintained a small grain size during reheating in the temperatures ranging from 1100°C to 1250°C. The growth of austenite was strongly retarded by Nb and Ti nitride and carbide. The higher end cooling temperature (650°C) had much influence on the refinement of microstructures, especially the length of ferrite packets, whereas the lower temperatures (600-500°C) had little effect on the microstructure refinement.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

49-52

DOI:

10.4028/www.scientific.net/MSF.561-565.49

Citation:

L.D. Yao et al., "Effect of Reheating and End Cooling Temperature on Microstructure Refinement in a Low Carbon High Strength Nb-Ti Microalloyed Dual Phase Steel", Materials Science Forum, Vols. 561-565, pp. 49-52, 2007

Online since:

October 2007

Export:

Price:

$35.00

[1] N. R. Bandyopadhyay and S. Datta: ISIJ Int. 44(2004), p.927.

[2] J. Qu, W. Dabboussi, F. Hasssani, J. Nemes and S. Yue: ISIJ Int 45(2005), p.1741.

[3] T. Waterschoot, K. Verbeken and B. C. De Cooman: ISIJ Int 46(2006), p.138.

[4] J. Lis, A. K. Lis and C. Kolan: J Mater Processing Tech, 162-163 (2005), p.350.

[5] B. Gardey, B. Bouvier and B. Bacroix: Metall Mater Trans, 36A(2005), p.2937.

[6] K-T. Park, Y. K. Lee and D. H. Shin: ISIJ Int 45(2005), p.750.

[7] S. Endo and M. Nagae: ISIJ Int 36(1996), p.95.

[20] [40] [60] [80] 450 500 550 600 650 700 Length Width End cooling temperature, ℃ Lath/plate length and width, µm.

[20] [40] [60] [80] 100 450 500 550 600 650 700 Length Width End cooling temperature, °C Packet length and width, µm Fig. 3 Relationship of ferrite packet length Fig. 4 Relationship of individual ferrite packet and width with end cooling temperature length and width with end cooling temperature.

DOI: 10.7717/peerj.1849/supp-5

In order to see related information, you need to Login.