Acta Metall Sin  1997, Vol. 33 Issue (5): 485-491    DOI:

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DUCTILITY LOSS AND Nb(C,N) PRECIPITATION IN Nb-CONTAINING STEEL SLAB IN THE TEMPERATURE RANGE FROM 700 TO 1000℃

WANG Xinhua;CHANG Bo;LI Jingjie (University of Science and Technology Beijing; Beijing 100083); ZHANG Li;YE Jinwei (Baoshan Iron and Steel Co.; Shanghai 201900)

WANG Xinhua;CHANG Bo;LI Jingjie (University of Science and Technology Beijing; Beijing 100083); ZHANG Li;YE Jinwei (Baoshan Iron and Steel Co.; Shanghai 201900). DUCTILITY LOSS AND Nb(C,N) PRECIPITATION IN Nb-CONTAINING STEEL SLAB IN THE TEMPERATURE RANGE FROM 700 TO 1000℃. Acta Metall Sin, 1997, 33(5): 485-491.

Abstract References Related Articles Recommended Metrics Download:  PDF(2192KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Hot ductility of the continuously casted Nb-containing steel slab was measured under the strain rate of 1×10-3 /s. It was found that in the fractured specimens,Nb(C,N) precipitation took place when temperature decreased to below 1100℃. The Nb(C,N) particles precipitated in the temperature range from 1000 to 950℃ were coarse and rondomly distributed in the specimens. When the temperature was lowered to 900℃, the precipitation content of Nb(C,N) reached maximum and fine Nb(C,N) precipitates were found both along γ grain boundaries and inside the grains with mean particle size of 5-8 nm and interparticle spacing of about 30 nm. As the result of Nb(C,N) precipitation, the hot ductility of the steel was significantly reduced in the lower temperature region of γ single phase. As the temperature decreased to below 800℃, film-like proeutectoid ferrites formed aIong the γ grain boundaries that further reduced the steel ductility. The eutectoid transformation of the Nb-containing steel was delayed compared to the steel without Nb. This leads to the extension of the low ductility of the steel to the lower temperature. Key words:  Nb-containing steel      continuous cast slab      hot ductility      Nb(C      N)      Received:  18 May 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I5/485 1 Turkdogan E T.Steelmaking ConfProc,1987;70:399 2 Maehara Y,Yotsumoto K,Tomono H,Nagamichi T and Ohmori Y.Mater Sci Technol,1990;6:793 3 Mintz B,Yue S,Jonas J J.Int Mater Rey,1991:36:187 4 马翔.物化检验,1985;4:215 5 Weiss I,Jonas J J.Metall Trans,1979;17A:831 [1] YUAN Bo, GUO Mingxing, HAN Shaojie, ZHANG Jishan, ZHUANG Linzhong. 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