The connecting rod converts the piston's reciprocating motion into the rotary motion of the crankshaft. During service, connecting rods are subjected to a various loads. In the case of the connecting ...rod investigated here, the failure occurred after just 20,000 km on the car's odometer (approximately 2 years of service). The paper describes the results of an analysis of the fractured connecting rod's shank.
Standardized and technological testing of the fatigue strength of spring steels is a complex and time-consuming, and therefore expensive, task. The determination of Woehler's (S-N) curves using a ...resonant pulsator is relatively fast and simple. In this investigation the test is performed using standard Charpy V-notched specimens with the aim to obtain an appropriate comparison with the results of technological tests on real springs. The steel springs were made of high-quality flat steel with a smooth shot-peened surface, free of notches and with no large microstructure or surface defects. The performed investigation can help with quality control and improvements to the properties of the steel springs. The paper presents a determination of the fatigue strength of 51CrV4Mo spring steel using a resonant pulsator. The notch effect, the influence of the microstructure and the surface quality are also discussed.
Tensile tests were carried out on specimens of the same micro-alloyed structural steel after different thermal treatments, with the aim being to obtain the microstructure in a weld's heat-affected ...zone. The mechanical properties were determined at a temperature below the brittle threshold transition Charpy temperature, the fracture surfaces were examined, the cleavage strength was deduced and the space orientation of the cleavage facets was determined. No relation was found between the results of the tensile tests and the previously determined Charpy properties after an identical thermal treatment.
The trends in industrial production are oriented to the use of industrial wastes respectively, to the zero waste production. It is important to know the exact quality and quantity of wastes, as a ...measure of the final yield of material and the reuse of wastes in closed or open loop. Results of investigations on billets of 52CrMoV4 and 27MnVS6 steels are presented. The reduction of weight after sand blasting, grinding and reheating was determined. The waste of material at sand blasting was between 0,35 % and 0,55 %, at grinding around 3,2 % and during reheating, with an unplanned standstill, about 2,45 %. These results are required for a more precise material flow in the production process.
