Ultra-deep cooling technology: When the metal is hardened by heat treatment to the cooling process, the alloy and carbon are dissolved and combined and diffused to form austenite. During the cooling process, martensite is formed by pressing at low temperature ( Martensite), Introduction Ultra-Cryogenic Technology: When the metal is hardened by heat treatment to the cooling process, the alloy and carbon are dissolved and combined and diffused to form austenite (Austenite), which is formed by pressing at low temperature during the cooling process. Martensite, and because the final transformation point (Mf) of martensite is very low, for example: W18Cr4V (high-speed tool steel) has a Mf point of more than -190 °C, so a large amount of austenite remains after quenching and cooling to room temperature. The body thus reduces the hardness, wear resistance and service life of the metal, and at the same time, metal fragmentation is easily caused by the high brittleness of austenite. Further, there are many physical properties, particularly thermal properties and magnetic properties.
Scientific As austenite is very unstable and decomposed in a low temperature environment, the original defects (portions of micropores and internal stresses) are plastically flowed into tissue refinement, so the metal is placed in an ultra-low temperature environment. , in which austenite is transformed into martensite, the internal stress is thus eliminated.
At ultra-low temperature, due to the shrinkage of the tissue volume, the Fe lattice constant shrinks and the driving force for the precipitation of carbon atoms is enhanced, so that the matrix of martensite precipitates a large amount of ultrafine carbides, and these ultrafine crystals increase the strength of the material and increase the resistance. Grindability and rigidity.
Ultra-low temperature transfers the transport energy of the metal atoms, so that the atoms can not be separated by diffusion and the atoms can be more tightly bound.
The metallurgical technical team successfully developed a unique ultra-deep cooling system, which is different from the general liquid nitrogen equipment. The system can automatically control the ultra-deep cooling process, and its temperature can be as low as -233 °C. This innovative technology surpasses the general The cryogenic treatment to achieve the absolute level of super-cry cold metal, this significant advantage can enhance the performance of the metal. Ultra-deep cooling technology helps manufacturers increase productivity and enhance core competitiveness.
Cryogenic treatment of domestic and international conditions Metal cryogenic treatment originated in Switzerland for more than 100 years. At that time, it was found that tools that were chilled by ice and snow could be used for a longer period of time. Swiss army knives, clocks and Gillette blades were the beneficiaries of this process. Beginning in the 1960s, the United States, the Soviet Union, Japan and other countries began research on metal cryogenic technology. A large number of experiments found that cryogenic treatment effectively extended the life of the tool. In the 1980s, several specialized deep-cooling companies in the United States, such as 3xistruments & Toling, Material Improvement, and Ame cry, carried out tools, grinding tools, gears, special springs, carbides, high-speed steel, and cobalt-based alloys. Cold treatment, the experimental results show that the cryogenic treatment has a significant effect on the service life of the above-mentioned material parts, and can be increased by 5 to 10 times. Domestic research was carried out in the middle of the 20th century. The dimensional stability test and application of molds, gages and tools were carried out using alcohol + dry ice. In the 1990s, various institutes began to conduct full research and analysis on high-speed steel, die steel, and hard alloy materials. Studies have shown that cryogenic treatment improves the wear resistance, toughness, hardness, dimensional stability, and corrosion resistance of these materials. Both play different roles.
When it comes to the development of cryogenic technology in China, it is impossible to mention the contribution of the Institute of Physics and Chemistry of the Chinese Academy of Sciences. In the 1990s, the leading company in the mold materials industry “one wins 100†found the Institute of Physics and Chemistry of the Chinese Academy of Sciences, introduced the progress and application of cryogenic technology abroad, but the price of imported equipment is high and the quality is not very stable, indicating that if physical and chemical can develop corresponding Equipment will definitely have a great impact and help on the domestic tool and mold industry. After 1 year of development, the first SLX cryogenic processing box was born, and it was quickly put into the practical application of a hundred wins. Subsequently, domestic enterprises in the institutes gradually deepened their understanding of metal cryogenic treatment, and the demand for equipment became increasingly strong. The Institute of Physics and Chemistry has cooperated with Taiyuan University of Technology, Lanzhou University of Technology, Tianjin University and Jiangbei Machinery Factory to conduct research on cryogenic treatment of high-speed steel, die steel and aluminum alloy materials, and summarized a large number of process parameters and practical experience. Nowadays, the Institute of Physics and Chemistry is still sparing no effort to promote the metal cryogenic treatment technology. The difference is that the cryogenic treatment equipment is more advanced and the process is more mature. It has been widely used in the industries of rolls, tools and molds.
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