膨胀曲线计算钢相变动力学的新方法

1、B. C. De Cooman10016A new HBt hod for cal cul at i ng the phase transf or matl on ki net I cs from adi I at at i on curve for mil 11 st ep transf or mat I onsJ. Z. Zhao1. B. C. De Cooman2institute of Metal Research, Chinese Academy of Science, Wcnhua Road 72, Shenyang 110016, China;Laboratory for Ir

2、on and Steelmaking, Ghent University, Technologiepark 9. B-9052 Ghent, BelgiumAbstract: A detailed analysis was made of the dilatation of a hypoeutectoid steel during a continuous cooling or an isothcnnal transformation. The relationship between the volume fraction of phases the temperature and the

3、composition of phases was built up using the density function of phases constructed using the thermal expansion coefficients. Isothermal transformations and continuous cooling experiments were carried out with a bainitic steel. The model was used to extract the phase transformation kinetics from the

4、 dilatation curves of this steel It was demonstrated that the model could be applied to calculate the phase transformation kinetics from a dilatation curve for a multistep phase transformation.Key words: Steel; phase transformation: dilatation, modelling1.13117#1 1 dp亍万万亍1200 °C【叫 300 °C14

5、J6 11300- 1200 °CpgSiMi Q = p（7；,SAM,C = O）g,（C）T”（一几）r（C） = 1-0.0146 W7%c,2 1ga（C） = 1-0.0262wf%C |14J#115）£ = （L-厶）/ 厶）A/7/（+J）1* pj3p d C.Trans j®）=-k；f 春NL Trans /八 °K+刀300 cC）；3）h(CQ、ga(CQ1/3-11）2）CgCPa答-(cc”孕咋£ 打 af? a h p?洪Pa * PaB°SmSiM*C = O）、<Pxa（Ta,Si.Mn.,

6、C = O>B1/3cMilMilp"EBk；B,何（严）1i/3a% +(l-6)Ca、ga（Cg）丿<p z>1/3-1+ fpa Ppa严Pa%dt /Py&r冷丿2cy+f孚二工fi亦-曙爲gadt rJr dt a a dT15k：pf.(7；,5/A/L.,C= 0)3pr(Ta,Si.Mn.,C = 0)pr(Ta.Si,Mn.C = 0)Pxa(Ta,Si,Mn.C = 0)0. 0128 P,3.(wt% 0. 155 C, 0.024 Si, 1.75 Mi.0.0015 S, 0.002 N. 0.041 Al, 0.0821 Ti,

7、0.106 Nb, 0.023 Cr, 0.023 Ni 1200 °C,2 m n3000 °Qrrin11911.48x10 52.25x10 s 1/°C6 °C /m n100 °C /iri n528548 °C16 °C / ni n68%100 °C / m n17%/ol82. 5%/ol0. 5%/ol528548 °CY95%/ol5 %/olA-St even HaynesB, (° C) = 830-270C%h7 - 9OM/?%vt7 - 37M%”/ - 7OCr%

8、 t - 83Mo%阳810100%12110100%#1°C54816 °C/iri n 2100 °Orrin 3528 °CTher mo- Cal c(Acm As)2Ta 727 °CTu冋a.f = 3.6309(1 + 2.7x1Mn%at + 7.8 x 1 (F1 Al%at +2.21x10"3 Nb%at+ 1.7x ACr%at - 56x l(r'M%a/ + 8.9x 10"4T/%a/10100%#10100%#pr(Ta.SiyMn.yC = 0)7725 kg/rrf10100%#1

9、0100%#0.05%M528 °C6 °C /rrl np心CC) = 7686.45一6.63 IO"2!-32 0T2pBa(TaSi,Mn,C = 0)= pEBa(TuSi.Mn.,C = 0)7635 Kg/rrf10100%#7640Ppa(T“SiMi ,C = 0)= pEadMl 、C = 0) kg/ rtf#(a)oI9V o00760°C9To50004#(b)100 °C/rri n b16如n705 °C628 °C2(a)558 cCB,123fPa 68%,100 °C/m n#2

10、(b)05咖。117%ol282.5%/ol1.000.75-V 0.50-0.25-0.0080.0060.0040.010O I0.002001000log(t), s3528 °C5%B$528 °C 40.002528 °C4548 °C5281528 °C 2548 °C丈。!I)548 °C2548 °CB.548 °C41254.121 M Takahashi and H. K. D. H. Bhadeshi a: J. Ltet. Sci. Letters, 1989, & 477

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13、967, 23,St uart: Bri t. J. A|)pl Phys., 1968, 1, 1291-95. G38,245-49.8 N. Ri dl ey and H.P. Kusht a and V. P. M khal chenko: Phys. Ltet. & 56- 60.9 T. I. Babyuk,Lbt al I ogr., 1974. T. I. Babyuk: Phys. Ltet. & 腑 tallogr., 1980, 49, 82-86.#11 M Oni nk, CM Br akman, F. D. Ti chel aar, E. J. M

14、ttemei j er and S. Zwaag:Scr i pt a al I urgi ca et er i al i a, 1993, 29, 1011- 16.MWN.H.EA.J.12 1131415161415E. St r aumani s and D. C. Ki rn 乙 Ltet al I kd., 1997, 62, Sounders and P. Hi dnert: U. S. B. S. Sci. Pap. 1926/27f Ri dl ey and H. Stuart: J. Lfet. Sci., 1970, 4, 219- 22. Esser and G M 1

15、1 er: Arch. Ei senh 11 enwes., 1933. 7f J. Fasi ska and H.Jabl onkaT K.乙 Zhao, C.Vfigenbl ast: Trans. Soc. Har st e and K. Schwer df eger: St eel Mespl ont, B. C. De Cooman:I SI J272-77.21, 524-28.265-68.1967, 239, 1818-20. 1991, 62, 24-33.41.Al咗.Res. fI nt er nat i onal, 2001127492-49616 W St even and A.17 D. J. Dyson and1956. 163, 349- 59.J. Haynes: J.