期刊
MATERIALS CHARACTERIZATION
卷 106, 期 -, 页码 452-462出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.05.030
关键词
First stage of tempering; 4340 steel; Transition-iron-carbide precipitates; Electron diffraction; Martensite
类别
资金
- Advanced Steel Processing and Products Research Center
Microstructural and crystallographic characteristics of fine-scale transition-iron-carbide precipitates formed in martensite during tempering of 4340 steel at 200 degrees C for 3.6 ks were studied via transmission electron microscopy. Precipitates of near-equiaxed shapes and about 10 nm in size were observed, and rows of closely spaced precipitates were aligned predominantly along < 100 > martensite directions. Aggregates of aligned precipitates were up to 150 nm in length, although occasional kinks were present that disrupted the alignment, and some of the adjacent precipitates possessed somewhat different crystallographic orientations. Electron-diffraction results were analyzed in detail and found to be consistent with both epsilon-carbide and eta-carbide phases. Similarities between these two phases were highlighted and discussed. Experimental electron-diffraction data were compared with data from five different unit cells, and each was found to be consistent within uncertainty ranges of +/- 0.003 nm for interplanar spacings, 2 for angles between plane normals, and a few degrees for the orientation relationship between precipitates and the matrix. (C) 2015 Elsevier Inc. All rights reserved.
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