Refinement of CFB/M High Strength Steel Micro-Alloyed with Nb

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A novel carbide free bainite/martensite (CFB/M) high strength steel of 1500MPa grade is micro-alloyed with Nb in order to refine the microstructure and improve the toughness. After the steel containing Nb was forged, coarse microstructure and strong transmissibility of structure were found. It is suggested that the large numbers of precipitates of Nb(CN) in the steel makes the structure transmissibility more serious. After solution treatment at 1200°C, both complete annealing twice and isothermal treatment at 600°C twice can eliminate the structure transmissibility and refine the structure. Investigation on refinement of cycle phase transformation shows that excellent effect of the grain refinement is obtained when the heating velocity exceeds some threshold. In addition, the temperature of austenitizing is of little influences on the size of refined austenite grain.

Info:

Periodical:

Materials Science Forum (Volumes 638-642)

Main Theme:

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu

Pages:

3140-3145

DOI:

10.4028/www.scientific.net/MSF.638-642.3140

Citation:

B.Z. Bai et al., "Refinement of CFB/M High Strength Steel Micro-Alloyed with Nb", Materials Science Forum, Vols. 638-642, pp. 3140-3145, 2010

Online since:

January 2010

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Price:

$35.00

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