Figure 2
TEM dark-field images of the twinned structure in quenched Fe-1.6 C (wt.%) martensite: (a) dark-field image showing the fine structure of the matrix crystals; (b) dark-field image showing the fine structure of the corresponding twinned crystals in martensite, the SAED pattern of the twinned structure is inserted between (a–c) the dark-field image of the matrix crystals after the specimen was heated to 200 °C; (d) the dark-field image of the twinned crystals after the specimen was heated to 220 °C. The subscripts ‘m’ and ‘t’ denote matrix crystal and twin crystal, respectively. All figures have the same scale bar as that shown in (d).
