The controlled cooling technology following hot rolling process is a vital factor that affects the final micro- structure and mechanical properties of the hot-rolled transformation induced plasticity （TRIP） steels. In the present study, low alloy C-Si-Mn TRIP steel was successfully fabricated by hot rolling process with a 4450 hot roiling mill. To maximize the volume fraction and stability of retained austenite of the steel, two different cooling methods （aircooling and ultra-fast cooling ＂AC-UFC＂ and ultrmfast cooling, air cooling and ultra-fast cooling ＂UFC-AC-UFC＂） were conducted. The effects of the cooling method on the microstructure of hot-rolled TRIP steel were investigated via optical microscope, transmission electron microscope and conversion electron Mossbauer spectroscope. The mechanical properties of the steel were also evaluated by conventional tensile test. The results indicated that ferrite and bainite in the microstructure were refined with the cooling method of UFC-AC-UFC. The morphology of retained austenite was also changed from small islands distributing in bainite district （obtained with AC-UFC） to granular shape locating at the triple junction of the ferrite grain boundaries （obtained with UFC-AC-UFC）. As a result, the TRIP steel with a content of retained austenite of 11. 52%, total elongation of 32% and product of tensile strength and total elongation of 27 552 MPa·% was obtained.
参考文献
| [1] | Pereloma E V;Timokhina I B;Hodgson P D .Microstructure and Mechanical Properties of Thermomechanically Processed C-Si Mn Steel[J].Ironmaking and Steelmaking,2001,28(02):199. |
| [2] | Ryu H B;Speer J G .Effect of Thermomechanical Processing on the Retained Austenite Content in a Si Mn Transformation Induced Plasticity[J].Metallurgical and Materials Transactions,2002,33A(09):2811. |
| [3] | Manohar P A;Kunishige K;Chandra T.Influence of Thermo-mechanical Processing on Microstructural Evolution in Si-Mn and Al-Mn TRIP Steels[J].Materials Science Forum,2003(426 432):1127. |
| [4] | Mahieu J;Maki J;Cooman B C D .Phase Transformation and Mechanical Properties of Si Free C-Ma-Al Transformation Induced Plasticity Aided Steel[J].Metallurgical and Materials Transactions,2002,33A(08):2573. |
| [5] | S. Papaefthymiou;W. Bleck;S. Kruijver .Influence of intercritical deformation on microstructure of TRIP steels containing Al[J].Materials Science and Technology: MST: A publication of the Institute of Metals,2004(2):201-206. |
| [6] | P.Jacques .Enhancement of the Mechanical Properties of a Low-Carbon, Low-Silicon Steel by Formation of a Multiphased Microstructure Containing Retained Austenite[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1998(9):2383-2394. |
| [7] | A.ZAREI HANZAKI .Retained Austenite Characteristics in Thermomechanically Processed Si-Mn Transformation-Induced Plasticity Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1997(11):2405-2415. |
| [8] | DONGSHENG LIU;F. FAZELI;M.MILITZER .A Microstructure Evolution Model for Hot Rolling of a Mo-TRIP Steel[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2007(4):894-909. |
| [9] | Jun H J;Park S H;Choi S D et al.Decomposition of Retained Austenite During Coiling Process of Hot Rolled TRIP-Aided Steels[J].Materials Science and Engineering,2004,379A(1/ 2):204. |
| [10] | LI Zhuang,ZHANG Ping-li,WU Di.Effects of Austempering after Hot Deformation on the Mechanical Properties of Hot Rolled Si-Mn TRIP Steel Sheets[J].材料热处理学报,2004(05):248-251. |
| [11] | Chen Y;Tang G Y;Wang L H et al.Research on Nb-Containing Hot Rolling TRIP Steel[J].Iron & Steel,2005,40(Supplement):882. |
| [12] | Li Z;Wu D;Hu R .The Developments of the Hot Rolled Si- Mn TRIP Steel Sheets[J].Iron & Steel,2005,40(Supplement):848. |
| [13] | T. WATERSCHOOT;L. KESTENS;B.C. De COOMAN .Hot Rolling Texture Development in CMnCrSi Dual-Phase Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2002(4):1091-1102. |
| [14] | I.B. Timokhina;P.D. Hodgson;E.V. Pereloma .Effect of Microstructure on the Stability of Retained Austenite in Transformation-Induced-Plasticity Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2004(8):2331-2341. |
| [15] | Gonser U.Mossbauer spectroscopy[M].New York:springer-verlag,1975 |
| [16] | Wakita M;Adachi Y;Tomota Y .Crystallography and Mechanical Properties of Ultrafine Trip-Aided Multi-Phase Steels[J].Materials Science Forum,2007,539-543:4351. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%