Fabrication, microstructures and mechanical properties of ZrO 2 dispersion-strengthened Q345 steel

Effects of Y2O3 Content on Wear Resistance and Corrosion Resistance of 316L/TiC Coating Fabricated by Laser Cladding

“…According to the energy spectrum analysis results in Table 4, it can be seen that the elements Fe, Cr, and Ni are distributed consistently and evenly in samples S0 and S1, but the element Ti exhibits evident enrichment phenomenon in the coating and the coating top. Analysis indicates that there may be the following two causes: on the one hand, there are TiC residues on the coating surface, the TiC particles have large size and small density (4.93 g/cm 3 ) and a part of TiC may float up in the molten pool, thus the element Ti is enriched in the coating top; on the other hand, the cause of the enrichment of element Ti inside the coating may be that the melt liquid inside the coating has a low viscosity, affecting the convection in the molten pool, causing weak diffusion of melting TiC, thus resulting in poor quality of the cladding layer [21]. According to Takamichi and Roderick [22], the dynamic viscosity (µ) of melt liquid is defined as follows:…”

“…In the bottom part of the coating, the G/R value is the largest, and it can be discerned from Figure 3f,i,l that the added Y 2 O 3 breaks the growth of crystals, having an effect of refining the microstructure. The causes of such effect are as follows: First, Y 2 O 3 is a rare earth element oxide, with large grain size and high density (5.03 g/cm 3 ), and the Y 2 O 3 is mostly distributed in the middle and lower parts of melt liquid in general, so the refinement effect is more evident in the middle and lower parts of the coating. This can also interpret why there is a molten undiffused Ti element distributed in the upper part of coating of samples S0 and S1.…”

“…As the world's population continues to grow and land resources are increasingly depleted, the oceans are attracting more and more attention from coastal countries [1], and to "develop marine equipment and construct marine engineering" is one of the important contents of China's strategy of building a powerful marine country. Q355B steel is a kind of common low-alloy high-strength marine steel, with excellent comprehensive mechanical properties, and it is widely used in such engineering fields with loading effects such as ship manufacturing, petroleum storage tank, bridge structure, special equipment, and hoisting machinery [2,3]. The marine service environment is severe, and this alloy steel has poor wear resistance and corrosion resistance, greatly shortening the useful life of marine engineering structures, limiting their application in environments, and bringing serious difficulty in offshore works.…”

Non-singular Fast Terminal Sliding Mode Control Torsional Vibration Suppression for PM Synchronous Transmission System of EVs

“…Torsional vibration problems in transmission systems already exist in industrial applications, such as rolling mills, servo motor control, or similar multi-mass systems. In such systems, torsional resonance frequencies exist as a function of motor and load inertia and shaft stiffness [6][7][8][9].…”