4 Metallographic structure
The microstructure pictures of quenching and annealing areas are as shown in Figure 2, Figure 3 and Figure 4.
The microstructure of quenching area is composed of fine tempered martensite, evenly distributed granular carbide and a spot of retained austenite; and the microstructure of annealing area is composed of spheroidite and evenly distributed surplus granular carbide.
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4) Tested by: Wan Li, PhD and associate professor; Foundry Laboratory, Material College, Huazhong University of Science and Technology