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Acta Metall Sin  2014, Vol. 50 Issue (5): 524-530    DOI: 10.3724/SP.J.1037.2013.00681
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CHEN Jun 1), Lü Mengyang 2), TANG Shuai 1), LIU Zhenyu 1), WANG Guodong 1)
1) State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
2) School of Materials and Metallurgy, Northeastern University, Shenyang 110819
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Abstract  The microstructure, mechanical properties and precipitation behaviors in a low carbon V-Ti microalloyed steel were investigated using thermal simulation. The microstructural characteristics of tested steel were analyzed using OM and TEM. The results show that the larger volume fraction of ferrite can be obtained for different isothermal temperatures. The ferrite volume fraction is increased and ferrite grain size is reduced as the isothermal temperature is lowered. The planar interphase precipitation can be observed for different isothermal temperatures, and both sheet spacing and precipitates size are refined by lowering isothermal temperature. Moreover, the nanometer-sized carbides have a NaCl-type crystal structure with a lattice parameter of about 0.436 nm and they can obey one variant of Baker-Nutting (B-N) orientation relationship of (100)carbide//(100)ferrite and [011]carbide//[001]ferrite. The precipitation hardening for the specimen treated at 680 ℃ for 30 min can reach 360.6 MPa.
Key words:  V-Ti microalloyed steel      isothermal temperature      microstructure      interphase precipitation      Vickers-hardness     
Received:  28 October 2013     
ZTFLH:  TG142.33  
Fund: Supported by National Natural Science Foundation of China (No.51204049) and Fundamental Research Funds for the Central Universities (No.N110607003)
Corresponding Authors:  TANG Shuai, lecturer, Tel: (024)83681803, E-mail:   

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