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Formation of Nanocrystalline Structure at the Surface of Drill Hole in Steel

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Figure

Fig. 1Preparation procedure of samples for SEM, TEM observations andmicrohardness measurements after drilling experiments.
Fig. 2The cross sectional SEM micrograph of the drill hole in theSCM420H steel. Section (I) illustrated in Fig
Fig. 4The microhardness across the boundary between NC and martensite structure regions in the SCM420H steel after drilling
Fig. 6The cross sectional SEM micrograph of the drill hole in the S45C steel with ferrite and pearlite structure

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