Özet:

In this study, commercially purchased 34CrNiMo6 material, also known as 4340 steel, was shaped by hot forging. The microstructure differences of the samples cut for metallographic processes before and after forging were observed by scanning electron microscope (SEM). Element ratios in the different regions formed were analyzed by energy dispersive X-ray spectrometry (EDS). X-Ray Diffraction (XRD) analysis was performed to find the dislocation density and crystallinity size in the materials. With XRD analysis, the lattice strain created by the forging process in the material was also calculated and compared with the raw material. The mechanical effects of the forging process on the material were examined and the changes in the material with the formation of dynamic recrystallization were investigated. The relationship between dynamic recrystallization and dislocation density is shown. At the same time, the microhardness values were measured according to HV0.5 and the relationship with the dislocation density was examined. As a result of the analysis, the dislocation density of the raw material decreased by 50% on average after forging, and the crystallite size increased by 20% on average. It was observed that the lattice strain value of the material decreased by about 30% after forging. . The relationship between the change of these values and the hardness values was investigated. The highest hardness was measured in the base material.

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