THREE DIMENSIONAL ATOM PROBE CHARACTERAZATION OF MICROSTRUCTURE EVOLUTION AND CARBIDES PRECIPITATION IN THE TEMPERED Nb-V MICROALLOYED STEEL

Acta Metall Sin

2008, Vol. 44

Issue (7): 786-790 DOI:

Research Articles

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THREE DIMENSIONAL ATOM PROBE CHARACTERAZATION OF MICROSTRUCTURE EVOLUTION AND CARBIDES PRECIPITATION IN THE TEMPERED Nb-V MICROALLOYED STEEL

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上海大学

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;. THREE DIMENSIONAL ATOM PROBE CHARACTERAZATION OF MICROSTRUCTURE EVOLUTION AND CARBIDES PRECIPITATION IN THE TEMPERED Nb-V MICROALLOYED STEEL. Acta Metall Sin, 2008, 44(7): 786-790 .

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Abstract Three dimensional atom probe combined with optical microscopy (OM) and transmission electron microscope (TEM) was applied to characterize the carbides precipitation and microstructure evolution in Nb-V microalloyed steel plates quenched and tempered at 500冾600 for 4h. The results indicated that, vanadium and niobium were almost dissolved in matrix with slight segregation of carbon in the as-quenched specimen. A cementite was detected in 450 tempering specimen, as well as V- and Nb-containing carbides with difference sizes and number density in 450,550 and 600 tempering specimens. A maximal strengthen effect of this fine precipitates was obtained at 550 tempering. The carbides started to be coarsened and spheroidzed in 650 tempering specimen.

Key words: Three Dimensional Atom Probe Micro-Alloyed Steel Carbide Tempered microstructure

Received: 23 November 2007

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TG113.25

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