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材料研究学报  2008, Vol. 22 Issue (3): 279-302    
  论文 本期目录 | 过刊浏览 |
马氏体冷轧-回火制备超细晶钢及其热稳定性
蓝慧芳;W.J.Liu;刘相华;
东北大学轧制技术及连轧自动化国家重点实验室
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
引用本文:

蓝慧芳; W.J.Liu; 刘相华 . 马氏体冷轧-回火制备超细晶钢及其热稳定性[J]. 材料研究学报, 2008, 22(3): 279-302.
, , . Ultrafine Grains Formed through Tempering Cold Rolled Martensite and the Thermal Stability Analysis[J]. Chin J Mater Res, 2008, 22(3): 279-302.

全文: PDF(1503 KB)  
摘要: 在低碳钢和低碳加铌、钒、钛微合金钢中,通过马氏体冷轧--回火的方法获得了尺寸为数百纳米的超细晶粒铁素体组织,研究了超细晶粒组的形成机制和热稳定性. 通过马氏体相变在这些钢中引入了大量高密度位错,马氏体冷轧后位错进一步增殖, 形成大量位错胞状结构;在500-600℃进行的60 min回火将上述胞状结构转变成具有清晰大角晶界的超细晶粒.在回火过程中形成的微合金元素碳化物对位错运动和晶界移动具有有效的“钉扎”作用,有助于获得超细晶组织并明显提高其热稳定性.
关键词 金属材料超细晶冷轧马氏体回火微合金钢    
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.
Key wordsultrafine grains    cold rolled martensite    tempering    microalloyed steel    precipitation
收稿日期: 2007-07-18     
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