The FeCoCrNiBx high-entropy alloy (HEA) coatings with three different boron (B) contents were synthesized on Q245R steel (American grade: SA515 Gr60) by laser cladding deposition technology. Effects of B content the microstructure and wear properties HEA coating investigated. In this study, phase composition, microstructure, micro-hardness, resistance (rolling friction) investigated X-ray diffraction (XRD), a scanning electron microscope (SEM), micro hardness tester, roller friction...

Although fly ash foam concrete (FAFC) is lightweight, heat-retaining, and insulating, its application options are constrained by weak construction short lifespan. The effects of various dosage ratios the foaming agent (i.e., hydrogen peroxide), silica fume, polypropylene fiber on dry density, compressive strength, thermal insulation performance, pore structure parameters, durability FAFC were analyzed in this study, which sought to address issues low strength FAFC. According findings, there...

Abstract In this paper, we exploit the use of peridynamics theory for graphical animation material deformation and fracture. We present a new meshless framework elastoplastic constitutive modelling that contrasts with previous approaches in graphics. Our peridynamics‐based elastoplasticity model represents behaviours materials high realism. validate by varying properties performing comparisons finite element method (FEM) simulations. The integral‐based nature makes it trivial to...

In this study, a multi-element microalloyed GCr15Si1MoNbV bainitic bearing steel was designed by adding trace amounts of Nb and V. The bainite/martensite/retained austenite/undissolved carbide multiphase with short heat-treated cycle remarkable comprehensive mechanical properties prepared via low-temperature austempering, which compared traditional quenched tempered martensitic microstructure. results showed that the microstructure Nb/V were better than those addition, as isothermal...

An efficient and reliable digital watermarking scheme is needed in a complex network environment to solve image copyright disputes. However, most existing technologies can only resist common processing perform poorly against attacks. To this end, an adaptive robust for resisting multiple distortions real scenes proposed work. First, reduce the impact of attacks on robustness algorithm, two-level stationary wavelet transform (SWT) applied extract low-frequency sub-band host image, which...

Nanostructured bainite was obtained in high-carbon Si-Al-rich steel by low-temperature (220–260 °C) isothermal transformation after austenitisation at different temperatures (900 °C, 1000 and 1150 °C). Improved strength-ductility-toughness balance achieved the nanostructured bainitic austenitised low °C Increasing austenitising temperature not only coarsened prior austenite grains packets, but also increased size fraction of blocky retained austenite. High (1150 remarkably decreased...

Abstract We extend the material point method (MPM) for robust simulation of extremely large elastic deformation. This facilitates application MPM towards a unified solver since its versatility has been demonstrated lately with varied materials. Extending invertible elasticity requires accounting several inherent limitations. as meshless exhibits numerical fracture in tensile deformations. eliminate it by augmenting particles connected domains. Besides, constant redefinition interpolating...

The effect of pre-corrosion pits on residual fatigue life for the 42CrMo steel (American grade: AISI 4140) is investigated using accelerated specimen in saline environment. Different pre-corroded times are used specimens, and tests with different loads then carried out specimens. studied, fracture surfaces examined by a surface profiler scanning electron microscope (SEM) to identify crack nucleation sites determine size geometry corrosion pits. Moreover, stress intensity factor varying...

In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects annealing temperature the microstructure and wear resistance were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), Vickers hardness tester roller friction tester. results showed that mainly composed body-centered cubic (BCC) solid solution face-centered (FCC) structural (Nb,Ti)C carbides prior...

To study the shrinkage and freeze-thaw durability of cement-fly-ash-stabilized brick concrete reclaimed gravel mixture (CFRBCA), recycled was used to replace 100% natural in cement-and-fly-ash-stabilized (CFRCA). Five different ratios were designed. Dry tests, temperature cycle ultrasonic microscopic analyses then conducted. The test results showed that water loss rate, dry strain, coefficient CFRBCA increased as age content tended be stable by approximately 40th day age. had a great...

The generalized Nash equilibrium problem (GNEP) is an extension of the standard (NEP), in which each player's strategy set may depend on rival strategies. In this paper, we present two descent type methods. algorithms are based a reformulation using Nikaido-Isoda function as unconstrained optimization. We prove that our globally convergent and convergence analysis not conditions guaranteeing every stationary point optimization solution GNEP.

In order to advance the utilization rate of multi-source solid wastes in Ningxia region China, 16 groups pavement base mixtures were designed with cement and fly ash (FA) as binders, steel slag (SS), silicon manganese (SMS), recycled crushed stone (RCS) composite aggregates. The evolution laws mechanical frost resistance properties mixture investigated by unconfined compressive strength (UCS), indirect tensile (ITS), freeze-thaw (FT), ultrasonic detection tests. Then, formation mechanisms...

The high-cycle, push-pull fatigue fracture behavior of high-C, Si-Al-rich nanostructured bainitic steel was studied through the measurement limits, a morphology examination and phase composition analysis surface, as well fractography crack propagation. results demonstrated that limits at 10⁷ cycles were estimated 710-889 MPa, for samples isothermally transformed temperature range 220-260 °C data extrapolation, measured under maximum cycle number 10⁵. Both interior inclusion sample surface...

The microstructures and mechanical properties of ausrolled nanobainite steel, after being tempered at temperatures in the range 200−400 °C, were investigated this study. After tempered, bainitic ferrite is coarsened volume fraction retained austenite reduced. hardness ultimate tensile strength decrease sharply. impact energy, yield strength, elongation increase with elevated temperature 200–300 °C but when samples are 350 400 °C. fracture appearance all tests a brittle fracture. variation...

In order to solve the problems of slow convergence speed and prone local optimization in ant colony algorithm, an improved algorithm potential field is proposed this study. Firstly, method pheromone affected by artificial introduced reduce blindness colony. Then, heuristic information used accelerate algorithm. Finally, decrease coefficient resultant force optimal problem. Compare with traditional experiments show that paper can get better results, terms path length number iterations,...

Creep damage is one of the main failure mechanisms high Cr heat-resistant steel in power plants. Due to complex changes stress, strain, and at tip a creep crack with time, it difficult accurately evaluate effects residual stress on rupture mechanism. In this study, two levels were introduced P92 alloy specimens using local out-of-plane compression approach. The then subjected thermal exposure temperature 650 °C for accelerated tests. chemical composition was obtained an FLS980-stm Edinburgh...