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| Influence of Mo on Tempering Precipitation in Nb–Mo–V Microalloyed Steels |
| WANG Zemin ZHU Xiaoyong LIU Wenqing |
| Key Laboratory of Advanced microanalysis; Shanghai University; Shanghai 200444 |
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Cite this article:
WANG Zemin ZHU Xiaoyong LIU Wenqing. Influence of Mo on Tempering Precipitation in Nb–Mo–V Microalloyed Steels. Chin J Mater Res, 2010, 24(2): 217-224.
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Abstract Nb–Mo–V micro–alloyed steels with different contents of Mo were tempered at 450–650℃ for 4 h after solution treatment at 1200℃ for 0.5 h, The Influences of Mo on the microstructureand the process of the carbides formation had been investigated by using three dimensional atom probe (3DAP) transmission electron microscopy (TEM). The results show that the hardness maximum of micro–alloyed steel with low Mo–contented appeared for tempering at 550℃, and that of high Mo–content sample appeared for tempering at 600℃; The carbides radius in high Mo–contented sample were smaller than that in low Mo–content sample tempering at 650 under TEM observation. That is due to Mo segregation at the carbides outer layer, inhibited the diffusion of the Nb and V from the matrix into the carbides, and also reduced the diffusion rate of C and alloyed element in matrix, so the growth of the particle was impeded.
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Received: 07 September 2009
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| Fund: Supported by National Nature Science Foundation of China No.50931003 and Graduate Innovative Foundation
of Shanghai University No.SHUCX0922 |
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