Investigation of effect on flywheel, crankshaft and camshaft by boronizing method

Metals and alloys are widely used in internal combustion engines. Deformations such as corrosion, oxidation, fatigue, fracture and corrosion that occur on the metals are affected the performance of internal combustion engines negatively. Considering these negative factors, it is necessary that improved the metal alloy materials. By boronizing process, surfaces which have hardness increase, wear, corrosion and high oxidation resistance can be obtained in metals. In this study, crankshaft, camshaft and flywheel, which are parts of internal combustion engines, are covered with Ekabor-2 dust for 4 hours at 950 ℃ by box boronizing method. The coating thickness is 150 microns. Samples were taken from the crank pin for the crankshaft and the camshaft, and for the flywheel the samples were taken from the regions exposed to friction. Coated and uncoated samples at the end of the boronizing process; spectrometer, optical microscope, SEM, EDAX, XRD, microhardness, wear, TGA and corrosion tests were applied. By repeating XRD and SEM analyzes for the phases and images that could be caused by the deformation of the surfaces due to wear were compared. Boron samples in microhardness results; 6,7 times for the crankshaft, 6,9 times for the camshaft crank pin and 5,8 times for the flywheel, increases were seen. In the wear analysis of boron samples; crank pin 4 times, camshaft lobes 4,3 times and flywheel 4,8 times wear resistance were seen. İt was found that these rates increased under the effect of increasing force. After the wear process, XRD and SEM images were taken again. In the TGA results, a mass increase of 2.3 % in the crank pin, 5 % in the camshaft lobes and 7.5 % in the flywheel was found between the boronized samples and the non-boronized samples. In the boronized samples against this mass increase; in the crank pin 300 ℃, in the camshaft lobes 100 ℃, in the flywheel 60 ℃ oxidation delay were occured. In corrosion resistance of boron samples; an increase of 85 % in crank pin, 21 % in camshaft lobes and 12 % in flywheel were seen. Obtained results have shown that remarkable improvement in abrasion resistance, corrosion resistance, hardness and oxidation values by coating the flywheel and crank pin using the boronizing method. In addition, experiments show that the life of boron materials will contribute to the national and individual economy.