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| Effects of Nb and V on Microstructural Evolution, Precipitation Behavior and Tensile Properties in Hot-rolled Mo-bearing Steel |
| Fu-ming LIU1,Jian-jun WANG1,2,Yu-jie LIU1,R.D.K. MISRA3,Chun-ming LIU1,2 |
1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, Liaoning, China
2. Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, Northeastern University,Shenyang 110819, Liaoning, China
3. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical and Materials Engineering, University of Texas at El Paso, TX 79968-0521, USA |
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Abstract Microstructural evolution, precipitation behavior, and tensile properties of four experimental Mo-bearing steels were studied to elucidate the effects of Nb and V on microstructural properties. The results indicated that the microstructure of hot-rolled steels consisted of polygonal ferrite and degenerate pearlite, and the morphology remained same after holding at 600 �� for 1 h. The smallest grain size was obtained in Nb-V-Mo containing steel, followed by Nb-Mo and V-Mo steels. Precipitation was less in the hot-rolled Mo-bearing steel. The maximum volume fraction of precipitates was obtained in Nb-V-Mo bearing steel, and the Nb-V-Mo complex carbonitrides were highly stable at 600 ��. In the Mo-bearing steel, the yield ratio was lowest at room temperature but highest at 600 ��, which was attributed to the precipitation of Mo carbides and drag effect of Mo solute on dislocation movement.
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Received: 01 December 2015
Published: 12 June 2016
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| Fund:the National Key Technology Research and Development Program of the Ministry of Science and Technology of China;the Fundamental Research Funds for the Central Universities |
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2016, Vol. 23 
