The objective of the present investigation was to evaluate microstructures of 316L stainless steel produced by laser powder bed fusion (LPBF) processing, as a function of processing parameters (specifically, build angle orientations and global energy density). Microstructures were characterized using an optical microscope attached with a software for a detailed analysis. Microstructure studies revealed that the grain size was only marginally affected by the build angle orientation. Micro-voids were minimal and almost no unmelted particles were noticed at relatively higher GED values, due to more complete melting conditions.

This research was presented the development of electric charge generator by applied pulse high intensity electric field. The power supply based on fly back converter comprises of a pulse generator using IC#MB3579 on the output high voltage adjustment by switching frequency adjustment at 50 Hz by using IC#TLP250 for ground isolator and signal expanding to Power MOSFET#IRFP450 driving to control high voltage transformer to generate 1 kV, 2 kV and 3 kV by using electrode cell (high intensity non-uniform electric field cell) for generate electric charge. The results showed that, when the adjustable high voltage increases the intensity of electric field, resulting in increased production of electric charge and increased respectively. The testing of electric charge quantity measuring will observation at high voltage 1 kV electric field intensity equal 5 kV/cm enables generate electric charge +1.25 kV and -1.19 kV, high voltage 2 kV electric field intensity equal 10 kV/cm enables generate electric charge +2.17 kV and -2.33 kV and high voltage 3 kV electric field intensity equal 15 kV/cm enables generate electric charge +3.37 kV and -3.15 kV. The developed in this research are design and develop of circuit generate pulse high voltage can produce positive and negative high voltage waveforms. By the power to the electric field cell by the principle of high non-uniform electric field (high intensity electric field) for application. The guidelines of this development will make the quantity of electric charge can produce both positive and negative electric charge are more quantity than the original. Therefore, this research can develop an applied research industry and innovation for commercial in the future.

The investigations of the impact of corrosive properties in mineral oils on the corrosion rates of different types of metals and the nature of such corrosion with respect to the corrosive compounds of mineral oils and the metal types were the aims and objectives of the research. The corrosive properties of two different types of selected crude oils and the chemical compositions of seven different types of ferrous metals were tested by the standard instruments and methodologies. The corrosion rates of the similar sized prepared metal coupons were determined by the relative weight loss method after certain immersion time periods in both crude oils. In addition, the corroded surfaces were observed by the optical microscope and analysed, decayed ferrous and copper amounts from metals into crude oils were tested by the atomic absorption spectroscopy (AAS) and the reductions of the initial hardness of the metal coupons were tested by the Vicker’s hardness tester. As the results ultimately there were found the higher corrosion rates from carbon steels, lower corrosion rates from stainless, intermediate corrosion rates from Monel metal, higher impact from salts on the metallic corrosion when comparing with other compounds, formation of FeS, Fe2O3 rarely, corrosion cracks and pitting corrosion, higher amounts of decay of ferrous and copper from some metals into crude oils and slight reductions of the initial hardness of most of metals.

The article presents a description of the technology for the production of magnetic composites based on amorphous iron alloys for use in electronics and electrotechnics. Technology of producing bulk amorphous materials using injection and suction the liquid alloy into a copper mold was presented. As part of the work, a bulk amorphous alloy with chemical composition Fe62Co9Y8W1B20 was produced using the injection method. On its basis, magnetic composites were produced with the participation of polymer resin in a mass fraction of 0.1%, 0.2%.

According to non-dendritic method, there are four main techniques working in Semi-Solid state. The four techniques for preparation non-dendritic samples were Semi-Solid Rheocasting (SSR), Cooling Slope (CS), Magneto-Hydrodynamic stirring (MHD) and Semi-Solid Rheocasting with Cooling Slope (SSR+CS). In this paper, the non-dendritic feedstocks prepared depending on the aluminum alloy A201. The feedstocks have been investigated using metallographic and Vickers hardness methods. The results of the work showed main difference between the non-dendritic samples and dendritic samples focusing in microstructure and hardness techniques. Comparing the non-dendritic techniques results, The Rheocasting (SSR) mothed was high result in the microstructure and mechanical properties.

Roll stands frames are the most important parts of a mill. This frame supports the work rolls and other devices or mechanisms that ensure lamination precision and mill productivity. The reaction forces created by metal deformation during rolling must be withstand by the frame. Therefore, when designing and executing mill frames, special attention must be paid to their mechanical properties, such as: stiffness and resistance. The roll stand frame must possess high stiffness, strength depending on the forces that will occur during rolling, but in the same time, the design must be simple and with minimal production costs. The aim of this paper is to present a computer-assisted design of a roll stand frame from a rolling mill used for cold rolling processes.