With Gleeble-1500 system, the influences of rolling temperature, finishing temperature and cooling rate on the mechanical properties of two ultra-high strength steels were analyzed. The microstructure of the hot rolled specimens was observed by optical microscope, TEM and SEM. The TRIP of HSLA steels was studied. The results show that the yield stress of 700 Mpa can be reached for two steels. The controlled rolling and controlled cooling technology has different effects on two steels, but it is rational to adopt finishing temperature 800 ℃ for both of them. The microstructure of the steels is mainly bainite, and the influence factors of mechanical properties are the size of bainite, and the size, distribution, composition and morphology of secondary phases. The deformation of high molybdenum steels at a high temperature with a high cooling rate would promote TRIP.
参考文献
| [1] | Ichiro Tsukatani;Shun Ichi Hashimoto;Tsuyoshi Inoue .Effects of Silicon and Manganese Addition on MechanicalProperties of High-Strength Hot-Rolled Sheet Steel Contai-ning Retained Austenite[J].ISIJ International,1991,31(10):992-1000. |
| [2] | H.-B. RYU;J.G. SPEER;J.R WISE .Effect of Thermomechanical Processing on the Retained Austenite Content in a Si-Mn Transformation-Induced-Plasticity Steel[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2002(9):2811-2816. |
| [3] | Sugimoto K;Usui N;Kobayashi M et al.Effects of VolumeFraction and Stability of Retained Austenite on Ductility ofTRIP-Aided Dual-Phase Steels[J].ISIJ International,1992,32(12):1311-1318. |
| [4] | Yu D G;Tan Y X.Study on Strength and Microstructure ofSteel[M].上海:上海科学技术出版社,1983 |
| [5] | Yong Q L;Ma M T;Wu B R.Microalloyed Steel-Metallurgyof Physics and Mechanics[M].北京:机械工业出版社,1989 |
| [6] | Khlestov V M;Konopleva E V;McQueen H J .Effect of HotDeformation on Austenite Transformation in Low Carbon Mo-Mn Steel[J].Materials Science and Technology,1998,14(08):783-792. |
| [7] | Sakuma Y;Mtsumura O;Takechi H .Mechanical Propertiesand Retained Austenite in Heat-Treated Bainite TransformedSteel and Their Variation with Si and Mn Additions[J].Metallurgical and Materials Transactions,1991,22(02):489-498. |
| [8] | Lechul S;Militzer M;Hawbolt E B .Modeling Austenite GrainGrowth Kinetics in a Ti-Nb HSLA Steel[R].The Chinese So-ciety for Metals. Beijing:Metallurgical Industry Press,2000. |
| [9] | Sun J L;Kang Y L;Wei X Y .Analysis on the Processand Mechanics of 800 MPa Grade Low-Alloyed Plate[R].Workshop on New Generation Steel. Beijing:Chinese Societyfor Metals,2001. |
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