Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter December 29, 2021

Development of Dual-phase Steels from Plain Carbon Sheet Steels

Sanjeev Kumar Misra and S. K. Nath

Abstract

An attempt has been made to develop dual-phase (d-p) steels from cold-rolled plain carbon sheet steels. Three plain carbon sheet steels with carbon content of 0.075, 0.095 and 0.2 wt.% have been selected. Intercritical heat treatments at 740 °C and holding times of 0.5, 1, 1.5, 2, 3, 4, 5, 8, 10, 15, and 30 minutes at this temperature followed by fast water quenching were used. A good combination of strength and ductility of d-p steels has been observed for the heat treatment cycle of 740 °C for 1.5 minutes and WQ. D-p steel with 0.075 wt.% carbon has shown an ultimate tensile strength of 560 MPa and a ductility (uniform elongation) of 16% whereas the starting material i.e. plain carbon cold rolled sheet steel, has a UTS of 382 MPa and a ductility of5.5 %. Similar improvements have been observed for other steels. These improvements in the mechanical properties are explained on the basis of the cold work energy and the kinetics of austenitisation during intercritical annealing.


S. K. Misra Bokaro Steel Plant Bokaro, Bihar
S. K. Nath Department of Metall. and Materials Engn. University of Roorkee Roorkee (U.P.) 247667 India

Literature

1. Rashid, M. S.: A Unique High Strength Sheet Steel With Superior Formability, SAE preprint 760206 (1976).Search in Google Scholar

2. Speich, G. R.: Physical Metallurgy of Dual-phase Steels, Conf. Proc. Fundamentals of Dual-phase Steels, in: R. A. Kot, B. L. Bramfitt (eds), The Metallurgical Society of AIME (1981) 3–45.Search in Google Scholar

3. Rashid, M. S.: G M 980 × – Potential Applications and Review, SAE preprint 770211 (1977).Search in Google Scholar

4. Hayami, S.; Farukawa, T.: Microalloying 75 (1975) 78–87.Search in Google Scholar

5. Tanaka, T.; Hishida, M.; Hashiguchi, K.; Kato, T.: R. A. Kot, J. W. Morris (eds), TMS-AIME, New York (1979) 221–41.Search in Google Scholar

6. Davies, R. G.: Metall. Trans. A 9A (1978) 671–79.Search in Google Scholar

7. Koo, J. Y.; Young, M. J.; Thomas, G.: Metall. Trans. A 11A (1980) 852–854.Search in Google Scholar

8. Yang, D. Z.; Brown, E. L.; Matlock, D. K.; Krauss, G.: Metall. Trans. A 16A (1985) 1523–26.Search in Google Scholar

9. Kim, H. J.; Thomas, G.: Metall. Trans. A. 12A (1981) 483–89.Search in Google Scholar

10. Kunishige, K.; Nagao, N.; Takahashi, M.: Tetsu-to-Hagone (J. Iron and Steel, Japan) 68 (a) (1982) 1177–84.Search in Google Scholar

11. Hong, J. H., Ji, T.G.; Shin, P. W.; Yoon, J. B.: J. Korean Inst. Met. 20 (1982) 16–22.Search in Google Scholar

12. Yong, D.; Lei, T.; Lin, Z.: Trans. Metall. Heat Treatm. (China) 2 (1981) 19–27.Search in Google Scholar

13. Nath, S. K.: “Influence of Intercritical Annealing on the Mechanical Properties of Plain Carbon Dual-phase Steels”, PhD thesis, University of Roorkee, Roorkee, India (1989).Search in Google Scholar

14. Prakash, O.: “Effect of Cold Working on the Morphology of Martensite and Mechanical Properties of Plain Carbon Dual Phase Steels”, M. Eng. Thesis, University of Roorkee, Roorkee, India (1994).Search in Google Scholar

15. Garcia, C. I.; Deardo, A. I.: Metall. Trans. A 12A (1981) 521–30.Search in Google Scholar

16. Jeong Woo Chang, Kim Chong Hee: J. Mater. Sci. 20 (1985) 4392–98.Search in Google Scholar

17. Souza, M. M.; Guimaraes, J. R. C.; Chawla, K. K.: Metall. Trans. A 13A (1982) 575.Search in Google Scholar

Received: 1998-02-02
Published Online: 2021-12-29

© 1998 Carl Hanser Verlag, München