Considering the effect of strain and chemical composition on precipitation behavior, new models for the start and end time of Nb(C, N) precipitation in austenite under the conditions of different temperatures and strains have been investigated for Nb microalloyed steel. The value of n in the precipitation kinetic equation has been deter-mined by using the available experimental data in literature, which indicated that n is a constant and independent of temperature. The values of the start and end time of the predicted precipitation are compared with the experimental values. Calculated results are in good agreement with the experimental results. Also, the evolution of austenite grains before ferrite transformation is simulated by taking the effect of precipitation into consideration. The measured austenite grain size is in good agreement with predicted one prior to ferrite transformation.
参考文献
| [1] | Medina S F;Mancilla J E;Hernandez C A .Static Recrystallization of Hot Deformed Austenite of Induced Precipitation Kinetics in Vanadium Microalloyed Steels[J].ISIJ International,1994,34(08):689. |
| [2] | A.QUISPE .Recrystallization-induced Precipitation Interaction in a Medium Carbon Vanadium Microalloyed Steel[J].ISIJ International,1997(8):783-788. |
| [3] | Medina S F;Quispe A;Valles P et al.Reerystallization-Precipitation Interaction Study of Two Medium Carbon Niobium Microalloyed Steels[J].ISU International,1999,39(09):913. |
| [4] | Dutta B;Sellars C M .Effect of Composition and Process Variables on Nb(C,N) Precipitation in Niobium Microalloyed Aus tenite[J].Materials Science and Technology,1987,3:197. |
| [5] | LIU W J;Jonas J J .Nucleation Kinetics of Titanium Carbonitride in.Microalloyed Austenite[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1989,20A(04):689. |
| [6] | XU Yun-bo .Prediction and Control of Mierostructure and Properties of Hot-Rolled Steels Based on Physical Metallurgy and Artificial Intelligence[D].沈阳:东北大学,2003. |
| [7] | Dong J.X.;Siciliano F. .Effect of Silicon on the Kinetics of Nb(C, N) Precipitation during the Hot Working of Nb-bearing Steels[J].ISIJ International,2000(6):613-618. |
| [8] | Koyama S;Ishii T;Narita K .Effects of Mn,Si,Cr and Ni on the Solubility and Precipitation of Nb in Fe Austenite[J].Journal of the Japan Institute of Metals,1971,35(11):1089. |
| [9] | Irvine K J;Pickering F B;Gladman T .Grain-Refined C-Mn Steels[J].Journal of the Iron and Steel Institute,1967,205(02):161. |
| [10] | Kurokawa S;Ruzzante J E;Hey A M et al.Diffusion of Niobium in Iron and Iron Alloys[J].Metal Science Journal,1983,17(09):433. |
| [11] | Medina S F;Quispe A .Influence of Strain on Induced Precipitation Kinetics in MicroaUoyed Steels[J].ISIJ International,1996,36(10):1295. |
| [12] | K.Minami .Mathematical Modeling of Mean Flow Stress during the Hot Strip Rolling of Nb Steels[J].ISIJ International,1996(12):1507-1517. |
| [13] | Sellars C M.The Physical Metallurgy of Hot Working[A].Sheffield,England,1979:3. |
| [14] | Roucoules C;Yue S;Jonas J J.Effect of Dynamic and Metadynamic Recrystallization on Rolling Load and Microstructure[A].London:the Inst of Materials,1993:165. |
| [15] | Hodgson P D;Gibbs R K .A Mathematical Model to Predict the Mechanical Properties of Hot Rolled C-Mn and Microalloyed Steels[J].ISIJ International,1992,32(12):1329. |
| [16] | Dutta B;Palmiere E J;Sellars C M .Modelling the Kinetics of Strain-Induced Precipitation in Nb Mieroalloyed Steels[J].Acta Materials,2001,49:785. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%