Received date: 2013-04-23
Revised date: 2013-05-14
Online published: 2013-07-11
The microstructure of a low alloy martensitic steel has been investigated using TEM. It was indicated that the as-quenched plate and lath martensites consist of ferrite matrix and high density of nanometer-scaled ultrafine particles embedded in the matrix. These particles were designated to beω phase with a primitive hexagonal crystal structure. Theω particles exhibit an orientation relationship with the ferrite (α-Fe) matrix as follows: [113]α//[2113]ω,(110)α //(1101)ω and (211)α//(0110)ω, with lattice parameters of aω=21/2aα , cω=31/2/2aα. The results of the present study suggested that the carbon atoms in the steel are not homogenously distributed in the martensites. The ferrite matrix possesses very low content of carbon, and most of the carbon atoms are concentrated in the ω phase.
Key words： Martensite; ω phase; C; microstructure; TEM
PING Dehai , YIN Jiang , LIU Wenqing , SU Yanjing , RONG Lijian , ZHAO Xinqing . THE ω PHASE IN A LOW ALLOY MARTENSITIC STEEL[J]. Acta Metall Sin, 2013 , 49(7) : 769 -774 . DOI: 10.3724/SP.J.1037.2013.00206
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