Advanced Materials Research Vols. 399-401

Abstract: In this paper, the kinetics of infiltration of 60Sn40Pb-10Ag molten solid lubricants into the TiC-Fe-Cr-W-Mo-V ordered porous sintering body were studied and the effective infiltration model which was used to analysis the kinetics of infiltration was established. The infiltration process was simulated by finite element method. The result showed that the main influence factors on the infiltration quality were the pressure ,the temperature and the time.

Abstract: This paper uses a metal cutting simulation software AdvantEdge FEM as the platform, and simulates the drilling process of 42CrMo with three different honed cutting edge K-Grade carbide drills. The aim is to study the influence of different magnitude of honed cutting edge on the maximum temperature of cutting area. According to the simulation, the maximum temperature does not absolutely increase with the honed edge radius increase. The cutting temperature reaches maximum when the honed edge radius is 0.06mm in this paper, meanwhile the margin of fluctuation in the smallest.

Abstract: Optimizing manufacturing process modeling is critical to improving the efficiency and quality of manufacturing. However, manufacturing processes in general can be very complicated. A manufacturing process may involve (a) transforming a material into a new form, (b) combining different materials to form a new object, and (c) retrieving a certain part from a material as a new entity. All those activities could be confusing because many intermediate objects that exist only for a short period during the manufacturing process may have no formal names. To solve this problem, this paper proposes that composition trees (CT) can be successfully used to model manufacturing processes. Composition trees are parts of the formal notation in behavior engineering (BE), which is an innovative approach to the development of large software systems. For a composition tree, its characteristics of being intuitive, expressive and formal give it many advantages over other formal and informal modeling languages in software engineering. This paper uses a cooking case study to demonstrate how to use a composition tree model manufacturing processes. It is argued that the method could be applied to process engineering to good effect.

Abstract: After the model of sterilization area was established, numerical simulate was completed with fluent software. Verified with certain conditions of hot air velocity, the laminar flow tunnel oven is able to meet the relevant requirements of GMP. Under different speeds of hot air, the tunnel oven vials’ relationship between temperature and time, combined with analysis of pressure distribution inside the oven. When the air speed range from 0.6m/s to 1.5m/s, the temperature of vials meet the requirements and the minimum effect of negative pressure to oven.

Abstract: In order to obtain the directional microstructure of different supersaturation and growing velocity, three simulations is calculated with different initial temperature. When the initial temperature is 1576K, and the supersaturation and growing velocity are smaller. The average space length of columnar crystals is bigger, and the directional microstructure grows by the wide columnar crystals. Microsegregation is smaller; when the initial temperature is 1574K, the supersaturation and growing velocity increase. when the initial temperature falls to 1566K, the planar interface comes back, and microsegregation decreases rapidly. The directional microstructure grows by the thinnest columnar crystals. At the same time, the transverse solute profiles and solute boundary layer are also talked in this paper.

Abstract: In order to obtain the directional microstructure of different supersaturation and growing velocity, three simulations is calculated with different initial temperature. When the initial temperature is 1576K, and the supersaturation and growing velocity are smaller. The average space length of columnar crystals is bigger, and microsegregation is smaller. when the initial temperature is 1574K, the supersaturation and growing velocity increase. The average space length of columnar crystals decreases, and microsegregation increase; when the initial temperature falls to 1566K, the supersaturation and growing velocity reach 1.176 and 3.238 cm per second. The microsegregation decreases rapidly. The average space length of columnar crystals is the smallest. The solute curve of columnar crystal is like a “U” figure. When the growing velocity is bigger than V_A, the phenomenon of solute trapping takes place.

Abstract: Based on the theory of processing map proposed by PRASAD, the power dissipation maps, the hot deformation instability maps and the hot processing maps of 1235 Al alloys treated by different methods of purification were built, and the effects of purification and deformation conditions at elevated-temperature on hot workability of 1235 Al alloy were analyzed. At the same time the optimum processing region and flow instability region were determined. The results show that the hot processing map of 1235 Al alloy has two instability zones in the temperature range of 300-500°C and in the strain rate ranging from 0.01s^-1 to 10.0s^-1 up to a true strain of 0.7, that is, one zone lying in the range of lower temperature and higher strain rate, the other zone in the range of higher temperature and mid strain rate. The purification effect has significant impact on hot workability of the alloy. It is found that the optimum processing region of 1235 Al alloy treated by high-efficient purification treatment is present in the range of higher temperature and lower strain rate zone, and its power dissipation efficiency is about 46%; while the optimum processing region of 1235 Al alloys treated by conventional refining treatment is present in the range of mid-temperature and lower strain rate zone or in the range of higher temperature and strain rate zone, and its power dissipation efficiency is about 23-29%. The results of observation of the deformation microstructure of 1235 Al alloy are in accordance with that of the hot processing maps of the alloy, thus showing that the calculation results of the hot processing maps are reliable.

Abstract: This paper describes method for extending shelf time of Dashehari mango fruit using a active packaging film (APF) which can release SO₂ fungicide. Mango fruits were assessed for weight loss (water loss), firmness, percent of decay, total soluble solids (TSS) over a storage period of 21 days at room condition. APF was efficient to reduce the decreasing firmness and TSS, maintain water of whole mango with any decay during 21days of storage

Abstract: Special SHY-99 anti-corrosion coatings are used for newly developed heat exchange equipment, to resist corrosion and leakage problem of carbon steel water-cooler. The anti-corrosion properties of coatings were examined with routine test methods, Scanning Electron Microscope (SEM), electro kinetic potential polarization curve method and immersion testing method. The results show that physical properties of coatings are in accordance with national standards, the microstructures of coatings are uniform and tight, the coatings are combined tightly with base metal, and the coatings show excellent corrosion resistance in water of water cooling system.

Abstract: To study the effect of brazing clearance and temperature on strength and microstructure, vacuum brazing of 316L stainless steel was carried out with BNi-2 nickel-based solder. Choose the different brazing clearance to be processed at 1070°C, analyzed the welding tissue by SEM and XRD, and found that hardness has been greatly improved to 664HV. The results showed that when the 316L stainless steel was brazed with BNi-2 filler metal at 1070°C, the structures of the welded joint were composed of FeNi3, Fe5C2, Cr5FeB3 metallic compounds and solid solutions. The microhardness of the welded joint by the center to both sides had a W-type distribution. When the width of the welded joint was 40μm, the microharedness of the center welded joint was lower than others, and shear strength of this clearance was the highest, about 300MPa.