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| Three dimensional atom probe observation of G. P. zone in micro-alloyed steel |
1. Instrumental Analysis and Research Center, Shanghai University, Shanghai 200444, China; 2. China Nuclear Power Technology Researeh Institute, Suzhou, Jiangsu 215004, China; 3. Panzhihua Iron and Steel Research Institute, Panzhihua, Sichuan 617000, China）
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Abstract By applying the techniques of optical microscope, field ion microscope （FIM） and three-dimensional atom probe （3 DAP） , the carbides precipitated from ferrite matrix on the early stage of niobium and vanadium micro-alloyed steels were characterized. 3DAP was carried out to investigate the carbides precipitate process in niobium and vanadium micro-alloyed steels. Niobium and carbon atoms segregating at a ferrite matrix （001） plane and the concentration of less than 5% were observed in the matrix during the initial precipitating stages of NbC. The monolayer enrichment zone of niobium and carbon atoms was considered as G.P. zone.
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2008, Vol. 29 
