Figure 1 shows the microhardness distribution curve in the thickness direction of the cladded specimen. The hardness shows a three-level step-down trend with the increase of the distance from the upper surface of the cladding layer. In the 0–600 µm thickness, the hardness is about 1100 HV0.5, and is the highest in the cladding layer. The highest hardness in this region is 1179 HV0.5, which is close to that of the Fe45.8Mo24.2Cr14.7Co7.8C3.2 bulk amorphous alloy tested (max HV0.5 1200). In the heat-affected zone, the hardness decreases significantly to about 400 HV0.5. The hardness of the substrate is the lowest of about 200 HV0.5.
Figure 1. Variation of microhardness along the thickness of the cladding specimen.
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