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Abstract: Recently Mg alloy has been aroused great interests from institutes and industries for its advantages of lightweight, environmental friendly and energy saving. Plastic deforming is an important way for material forming. However, due to its hexagonal closed packed crystal structure, there is only basal slip to be actived under the room temperature, it is very hard to forming by plastic method. Crystal Plastic finite element method is an effective method to study mechanism of deformation from micro-scale to macro-scale, which is helpful to understand the mechanism of plastic deformation in mesoscale and design reasonable plastic forming technology by this method. In this article, firstly, the research progress of crystal plastic finite element method of Mg alloy was reviewed, including the theoretical mechanism of plastic deformation that could be divided into two parts, one was deforming model, and the other was hardening model. Secondly, the latest applications of crystal plastic finite element method were presented, which included the effects of slip and twin on plastic deformation, comparison between crystal plastic simulation and experimental verifying, the relationship between the local stress distribution and the twin forming and distribution, multiscale researching on crystal plastic finite element method, and then the problems in crystal plastic finite element method for Mg alloy were shown. Finally, the future research directions of crystal plastic finite element method for Mg alloy were pointed out.Abstract: Recently Mg alloy has been aroused great interests from institutes and industries for its advantages of lightweight, environmental friendly and energy saving. Plastic deforming is an important way for material forming. However, due to its hexagonal closed packed crystal structure, there is only basal slip to be actived under the room temperature, i...Learn More
Abstract: The problem of icing on metal surface seriously affects the development of many fields, such as architecture, aerospace, it can even causes significant security risks and economic losses. Thus, it is urgent to solve the problem of icing and ice accumulation on metal surfaces. The traditional anti-icing and deicing methods are not only expensive, but also inefficient. Therefore, it is urgent to develop a new generation of anti-icing and deicing technology. With the continuous development of bionics, inspired by the "lotus leaf effect", superhydrophobic surfaces, which exhibit large contact angle and low contact angle hysteresis have gradually attracted large numbers of attentions. The burgeoning superhydrophobic surfaces not only display excellent anti-icing and deicing performance, but also exhibit many advantages such as low energy consumption and high efficiency, showing good application prospect. In this paper, the fabrication methods of superhydrophobic surfaces in recent years was introduced, the influencing factors and internal mechanism of superhydrophobic surfaces for anti-icing was discussed, the anti-icing and deicing techniques of intelligent responsive superhydrophobic surfaces was summarized. In addition, the long-term durability and stability of superhydrophobic surfaces for anti-icing under low temperatures, large-scale fabrication and the future development of intelligent responsive superhydrophobic surfaces were prospected.Abstract: The problem of icing on metal surface seriously affects the development of many fields, such as architecture, aerospace, it can even causes significant security risks and economic losses. Thus, it is urgent to solve the problem of icing and ice accumulation on metal surfaces. The traditional anti-icing and deicing methods are not only expensive, bu...Learn More
Abstract: In recent years, with the development of laser technology and the transformation and upgrading of domestic manufacturing industry, the application of laser cladding remanufacturing technology is increasing. Mold as a common equipment of industrial production, its service life directly affects the production cost and efficiency of the enterprise.Wear is a common form of mold failure. In order to restore the performance of the mold and prolong the service life of the mold, The laser cladding remanufacturing technology to repair worn mold is studied in this paper. Firstly, the laser cladding remanufacturing is outlined, and the main technological process of the mold laser cladding remanufacturing is introduced. Then, taking 45 mold steel as an example, based on the analysis of the die material and weldability, the laser cladding material is selected reasonably, the mold is remanufactured by the experimental method, and the metallographic microscope analysis, hardness test and wear test are carried out.The research results show that the average hardness of the worn mold surface is about 55.5HRC after being remanufactured by laser cladding, and the wear resistance is doubled, and a good application effect has been achieved. Therefore, the laser cladding remanufacturing technology has a broad application prospect in repairing worn mold.Abstract: In recent years, with the development of laser technology and the transformation and upgrading of domestic manufacturing industry, the application of laser cladding remanufacturing technology is increasing. Mold as a common equipment of industrial production, its service life directly affects the production cost and efficiency of the enterprise.Wea...Learn More
Abstract: The steel industry accounts for about 7% of the total human carbon dioxide emissions, and faces enormous pressure to reduce emissions, especially the blast furnace (BF) process with high carbon dioxide emissions. BF hydrogen injection is one of the important technical measures for emission reduction. However, there are still few studies on the limit of hydrogen injection in BF and the influences of hydrogen injection on the changes of main indicators of BF. To evaluate the limits of BF hydrogen injection and these effects, this paper introduces in detail the application of Excel MMULT (MINVERSE (zone 1), (zone 2)) function to build BF mass and heat balance model and application of the Generalized Reduced Gradient (GRG) nonlinear optimizer of Excel Solver Add-In for BF operation optimization. The paper simulates the effects of hydrogen injection on the replacement of BF coke and pulverized coal, the reduction of CO2 emission, the increase of production, and the changes of raceway adiabatic flame temperature (RAFT) and top gas temperature (TGT), the use of blast temperature (BT), and oxygen enrichment for thermal compensation. The possible limits of hydrogen injection are simulated. The influences on BF direct reduction degree (Dr), CO and H2 utilization rate (ηCO and ηH2) are also simulated. Further, the influences of hydrogen preheating injection on coke ratio, CO2 emission reduction and use of BT, oxygen-enrichment for thermal compensation are simulated. The paper comprehensively and quantitatively evaluated the various aspects of BF hydrogen injection. The simulation results show that when hydrogen is injected at room temperature (298 K), under condition of full coke, 1250°C BT, oxygen enrichment and maintaining 1800°C RAFT, the maximum CO2 emission reduction of the BF can reach ~30%. If the allowable RAFT is 1900°C, the maximum hydrogen injection volume is about 1/3 less than 1800°C, and the maximum CO2 emission reduction will be ~20%. 1 kg/thm of hydrogen injected can replace about 2 kg/thm of carbon; this value varies with BT and oxygen enrichment rate, but is not affected by the composition of the mixed ore.Abstract: The steel industry accounts for about 7% of the total human carbon dioxide emissions, and faces enormous pressure to reduce emissions, especially the blast furnace (BF) process with high carbon dioxide emissions. BF hydrogen injection is one of the important technical measures for emission reduction. However, there are still few studies on the limi...Learn More
Abstract: HR3C is an advanced heat-resistant alloy, and its high-temperature oxidation resistance directly determines the service performance of the material. Therefore, exploring the high-temperature oxidation behavior of HR3C is of great significance for the theoretical research and practical application of the material. The oxidation kinetic curve, oxide film morphology, oxide film composition, and oxide film phase composition of HR3C samples in the supply state after being oxidized in water vapor at 700°C for 50h, 150h, 250h, 350h, 450h, 550h and 600h were analyzed by SEM (Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy) and XRD (X-ray diffraction). The results show that the oxidation kinetic curve of the material conforms to the parabolic law, the oxide film first forms a lamellar oxide, and the lamellar oxide film grows alternately to form a loose and porous oxide film surface, the oxide is composed of three oxides: Fe3O4, FeCr2O4 and Fe2O3. The FeCr2O4 is a spinel compound, which can form a dense oxide film, and the diffusion coefficient of metal ions in it is small, which hinders the diffusion and mass transfer of ions, thereby improving the high temperature oxidation resistance of stainless steel. The element Cr is mainly enriched in the inner oxide layer, and the element Fe is relatively high in the outer oxide layer.Abstract: HR3C is an advanced heat-resistant alloy, and its high-temperature oxidation resistance directly determines the service performance of the material. Therefore, exploring the high-temperature oxidation behavior of HR3C is of great significance for the theoretical research and practical application of the material. The oxidation kinetic curve, oxide ...Learn More
