With the development of modern industrialization, the development of surface engineering in the field of materials science and engineering is the fastest, and foreign experts predict that surface engineering will be one of the key technologies for industrial development in this century. 11. The greatest advantage of surface engineering is that it can be used on the surface of cheap materials. A thin layer of excellent surface properties that cannot be obtained from the base metal provides the structure with higher wear resistance, corrosion resistance and high temperature resistance than the base metal, thereby increasing the service life of the equipment, saving resources, increasing productivity, and fully The date of receipt of the payment: 200b 0 24; Revision date: 2001-07-07 Fund project: National Natural Science Foundation of China (59905017). Tsinghua University's 985 Fundamental Research Fund and the Laboratory Open Fund sponsored the use of materials. Composite materials, especially metal matrix composites, have become the focus of development in the field of materials science and engineering in this century due to the high toughness of metal matrix materials, the high strength of reinforced materials, and their light weight. The organic combination of the research results of metal matrix composites and surface engineering technology has been highly valued by peer experts in the field of materials science and surface engineering at home and abroad. Since 1990s, many researches have been carried out on the surface layer technology of laser cladding ceramic particles reinforced metal matrix composites. Beijing: Machinery Industry Zhang Di, Shan Jiguo, Ren Jialie. The research status and development trend of high energy beam surfacing technology (continued from page 11). Under this test condition, the 8mm chrome alloy powder paste block formed a dense complex gold layer of about 7mm. From 1mm to 7mm, the organization characteristics In order to distribute the different forms of carbides on the sorbite matrix, it surrounds the incompletely dissolved ferrochrome particles. The closer to the outer layer, the more ferrochrome particles, the larger the size, see detailed analysis. Calculate the temperature at 7mm according to the first t in Table 2 as 1281°C. In order to examine the credibility, we also list the second t and calculate that the thermal action time extends beyond t to reach the highest point, and calculate 7mm. The temperature is 1 271 °C. The calculation results of the two methods are relatively close. The minimum sintering temperature of the chromium alloy layer calculated by the two methods is true and reliable. The verification method is to apply a layer of protective agent on the surface of the pressed chromium alloy powder paste block and put it into a box type high-temperature furnace with a control accuracy of ±5°C to simulate the characteristics of the sintering fracture at different temperatures. See Table 3. Data show The minimum sintering temperature of the chrome alloy powder paste is between 1250 and 1300°C, indicating that the above calculation results are more reliable.
Sintered microstructure at 1300°C see. It can be seen that alloy carbides have formed between the ferrochromium grains, the melting is quite sufficient, and the liquid sintering quality is reliable.
Table 3 Sintering Test Results Table Heating Temperature/C Holding Time/h Fracture Characteristics Unmelted, Loose Fractures Black and White Halves, Partial Sinter Fractures, White, Sintered Dense Alloy Powder Paste Sintered Microstructure 500X 4 Conclusion From Temperature Field In terms of distribution, the temperature gradient of the chromium alloy layer is smaller and the sand pattern is larger, indicating that the heat of the sample mainly acts on the alloy powder paste.
The calculated and measured results indicate that the minimum liquidus sintering temperature of the chrome alloy layer is 1280 chrome. The formation of the chrome alloy layer is based on the strong thermal action of the molten steel. Most of the ferrochrome powder melts, and the eutectic solidifies and sinters together.
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