Acta Metall Sin  2008, Vol. 44 Issue (11): 1292-1298     DOI:

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INFLUENCE OF THE PARTIAL SUBSTITUTION OF SI BY AL ON THE MICROSTRUCTURE OF THE HOT ROLLING TRIP STEELS BASED ON DYNAMIC TRANSFORMATION OF UNDERCOOLED AUSTENITE

;;LI Longfei;;

北京科技大学

LI Longfei. INFLUENCE OF THE PARTIAL SUBSTITUTION OF SI BY AL ON THE MICROSTRUCTURE OF THE HOT ROLLING TRIP STEELS BASED ON DYNAMIC TRANSFORMATION OF UNDERCOOLED AUSTENITE. Acta Metall Sin, 2008, 44(11): 1292-1298 .

Abstract References Related Articles Recommended Metrics Download:  PDF(2694KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Abstract: The effect of Al partial substituted Si on the microstructure of the hot rolling TRIP (transformation induced plasticity) steels with identical contents of C and Mn on the basis of the dynamic transformation for undercooled austentie (DTUA) was investigated by uniaxial hot compression tests on a Gleeble1500 simulation test machine. The effects of Al on the characters of DTUA, the evolution of microstructure and retained austenite have been studied. The results showed that the partial replacement of Si with Al could reduce the γ area in the equilibrium phase diagram, increase the A3 temperature and enlarge the range between A3 and Ar3. In addition, when the Si was partial replacement by Al, the kinetics of ferrite transformation during DTUA was accelerated and the optimum isothermal bainitic temperature was increased when the isothermal treatment was implemented. Moreover the granular retained austenite of C--Mn--Al--Si steel was more smaller and dispersion and the carbon content of retained austenite was higher than the C--Mn--Si steel, but the grain size of ferrite was coarser than the latter. Key words:  hot rolling TRIP steels      dynamic transformation of undercooled austenite      Si      Al      transformation kinetic      Received:  17 March 2008      ZTFLH:  TF777.1   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors LI Longfei URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2008/V44/I11/1292 [1]Zackay V F,Parker E R,Fahr D.Trans ASM,1967;60: 252 [2]Tosal-Martinez L,Vanderschueren D,Jacobs S,Van- deputte S.Steel Res,2001;72:412 [3]Girault E,Mertens A,Jacques P,Houbaert Y,Verlinden B,van Humbeeck J.Scr Mater,2001;44:885 [4]de Meyer D,Vanderschueren D,de Cooman B C.ISIJ Int, 1999;39:813 [5]Manohar P A,Kunishige K,Chandra T.Mater Sci Forum, 2003;426-432:1127 [6]Manochar P A,Kunishige K,Chandra T,Ferry M.Mater Sci Technol,2002;18:856 [7]Yin Y Y,Yang W Y,Li L F,Sun Z Q,Wang X T.Acta Metall Sin,2008;44:686 (尹云洋，杨王玥，李龙飞，孙祖庆，王西涛．金属学报，2008；44：686) [8]Li J C,Yin Y Y,Li L F,Yang W Y,Sun Z Q.J Iran Steel Res,accepted (李建成，尹云洋，李龙飞，杨王明，孙祖庆．钢铁研究学报，待发表) [9]Miller R L.Trans ASM,1964;57:892 [10]Emadoddin E,Akbarzadeh A,Daneshi Gh.Mater Char- act,2006;57:408 [11]Liu S K,Zhang G Y.Metall Trans,1990;21A:1509 [12]Guo H,Eenomoto M.Metall Mater Trans,2007;38A:1152 [13]Yang W Y,Qi J J,Sun Z Q,Yang P.Acta Metall Sin, 2004;40:135 (杨王玥，齐俊杰，孙祖庆，杨平．金属学报，2004；40：135) [14]Hanlon D N,Sietma J,van der Zwaag S.ISIJ Int,2001; 41:1028 [15]Timokhina I B,Hodgson P D,Pereloma E V.Metall Mater Trans,2003;34A:1599 [16]Jacques P,Cornet X,Harlet Ph,Ladriere J,Delannay F. 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