One of the methods of surface hardening the majority extensively used surface hardening procedure which can be used in many metals in their entirety in today’s applications. Induction coil is concentrated to the localized area where the necessary piece is hardened of the material. A high inductance coil is used to heat the surface of steel into the austenitic region. High heat transformation rates result in instant quenching by oil, resulting in a steep temperature gradient. This method necessitates external quenching because it induces phase conversion from austenite to martensite. This review paper ensures an overview of the principles of induction surface hardening, as well as some of its advantages over traditional hardening techniques. The results of experiments and computational approaches reported by different researchers are discussed.
XLPE is currently commonly used in high voltage underground cables. Several researchers recently chose several nanofillers to improve the electric tree’s strength in the polymer matrix. Alumina AL2O3 nanofiller have been utilized to investigate the effects on the electrical treeing in XLPE. The percentage concentration were used as follows with different amounts “0.3wt.” % and “1wt.”% from weight of base material. The needle-plane electrodes were used in this investigation and gap selected between needle and plane earth is 3 mm. The growth and morphology of treeing in XLPE insulation have been observed by using charge coupled device camera CCDc and microscope system. Scanning of electron microscopes SEM has been investigated the nanoparticles spread in base material. The outcomes show the tree inception voltage TIV values 12.5, and 14.8 KV “0.3wt.” % and “1wt.”%, respectively in XLPE composites that is mean the TIV increase with increase concentration nanofiller, while the tree propagation time at 2mm length increase about 40 min and 2 hours in “0.3wt.” % and “1wt.”% AL2O3/XLPE, respectively compared with unfilled XLPE, as well as the breakdown time BDT enhancement by4.347% and 13.043% for 0.3wt% and 1 wt% nano AL2O3 composites compared with unfilled XLPE insulation. And showed pictures taken with a SEM Diffusion and accumulation of nanoparticles in the XLPE material.
In this study AA7100/6wt% Al2O3 metal matrix composite (AMMS) wassuccessfully manufactured using stir casting route. The influence of 6wt% Al2O3content on microstructure, electrical properties and wearresistance were investigated . The microstructure of composite revealed thathomogeneity of Al2O3 particles in the matrix and also the reinforcement ofgrains compared to matrix grains. The homogeneity and reinforcement can beattributed to enhance the electrical and wear properties and this perhaps coulddue to efficiency of stirring process during the casting. The 6wt% Al2O3content shifted the conductivity and permittivity from reducing in matrix toincreasing in the composite when the frequency increased. The wear resistancewas improved due to addition of 6wt% Al2O3 compared to matrix.
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