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| Ultrafine Grains Formed through Tempering Cold Rolled Martensite and the Thermal Stability Analysis |
| ;LIU Xianghua; |
| 东北大学轧制技术及连轧自动化国家重点实验室 |
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Cite this article:
LIU Xianghua. Ultrafine Grains Formed through Tempering Cold Rolled Martensite and the Thermal Stability Analysis. Chin J Mater Res, 2008, 22(3): 279-302.
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Abstract Ultrafine ferrite grains with size about several hundred nanometers were obtained through tempering the cold rolled martensite in a low carbon and in a microalloyed steel bearing Nb, V and Ti. In this paper, the mechanism for the formation of the ultrafine grained microstructure was discussed. Dislocation cell structures formed in martensite during cold rolling were developed into ultrafine ferrite grains with sharp and large misoriented boundaries during tempering at temperatures from 500℃ to 600℃ for 60 minutes. During the tempering process, microalloying precipitates formed and effectively pinned the dislocation movement and the migration of the grain boundaries. As a result, the thermal stability of the ultrafine grained microstructure is improved.
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Received: 18 July 2007
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