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Öğe Effect of static strain aging on the fatigue behavior of S275JRC steel(Carl Hanser Verlag, 2017) Bülbül, A.; Kaçar, R.; Emre, H.E.In this study, the effect of static strain aging on the fatigue behavior of a mild steel (S275JRC) was evaluated. For this purpose, the 5 % prestrained mild steel was aged at a temperature of 160 °C for different intervals. The aging behavior was determined primarily for the as-received (AR) as well as in the homogenization and normalizing heat treated (H+N heat treated) condition. The yield stresses before and after aging process as well as the hardness values of the aged steels were measured for the assessment of the strain aging progress. The dynamic mechanical behavior of strain aged samples was also determined by fatigue test under the dynamic loads. An increase in the yield strength due to strain aging and hardness induced improvement in fatigue strength of the steel were observed. © Carl Hanser Verlag GmbH & Co. KGÖğe Fatigue behaviours of friction welded drill pipes(2013) Emre, H.E.; Kaçar, R.The drilling pipes are used under the different load in the service condition. In this study, N80-N80 similar drill pipes and N80-42CrMo4, N80-S355J2 dissimilar steel pipes were welded with friction welding process. The fatigue behavior of welded samples was investigated and the results were interpreted by considering the hardness values and tensile strength. It was found that the fatigue behaviour of friction welded samples recovered by the increasing tensile strength and hardness.Öğe Friction stir spot weldability of Al-Cu-Al material couple(2011) Kaçar, R.; Emre, H.E.; Demir, H.; Gündüz, S.Recently joining of metallic materials has gained a big importance. The problem can arise joining of advanced and new materials especially in industry. Thus, the solid state bonding methods have become much more popular effective in joining such materials. One of them is friction stir spot welding. In this study, 5754 quality aluminum couple using interlayer copper were joined by friction stir spot welding method using 1000 and 1600 rpm pin rotation for 3 and 5 second time intervals. The mechanical and metallurgical properties of weldment determined. The finding from this study compared with result that was obtained from FSSW Al-Al couple. The mechanical properties of FSSW welded Al-Cu-Al couple found better than Al-Al weldment.Öğe Resistance spot weldability of deformed TRIP800 steel: Various parameters were investigated for obtaining optimum tensile shear strength, weld button geometry, and electrode indentation(American Welding Society, 2016) Emre, H.E.; Kaçar, R.In order to simulate automotive manufacturing conditions, the spot weldability of cold-deformed, in tension by 10%, TRIP800 steels was investigated in this study. Tensile shear strength and failure mode associated with button geometry and electrode indentations were also evaluated, and weld lobe was drawn for resistance spot-welded deformed TRIP800 steel. The microstructure of the weldment was evaluated and the hardness profile of the weldment was also determined. It was found that the properties of the weldment are directly related to parameters used for the process and deformation of base metal prior to welding. It was found that the button diameter and button size ratio of deformed TRIP800 steel spot welds should be at least 4t and 0.14-0.30, respectively, for pullout failure mode, acceptable shear strength, and surface quality. Copyright © 2016 by American Welding Society in both printed and electronic formats.
