Dr. Yuan Zongyou (Transliteration) of the Korea Materials Research Institute (KIMS) Metal Materials Research Headquarters and Dr. Hong Chengjiu (Transliteration) of the Industrial Application Measurement Headquarters of the Korean Academy of Standards (KRISS) jointly announced the successful development of a pure titanium sheet Technology can improve strength and formability at the same time.
The pure titanium plate rolled by this technology can be used to make heat exchangers and is widely used in power stations, shipbuilding and other industries. It is expected to improve efficiency while saving manufacturing costs.
Pure titanium has strong corrosion resistance and high bioaffinity. It is an irreplaceable material. It is mainly used in chemical, environmental protection, power generation and biological fields. In order to promote the application of pure titanium in various industries, it is mainly rolled into a sheet and then formed into an ideal shape through a forming process. However, it is almost impossible to make a free-form titanium plate without breaking. Strength and formability are determined by the purity of pure titanium. Generally speaking, strength and formability are a pair of incompatible indicators.
During the smelting process of high-purity titanium ingots, as the purity increases, the formability of titanium materials will be improved, but the strength will be reduced. Therefore, it takes a lot of raw materials to manufacture thick plates. In contrast, during the smelting process, although low-purity titanium ingots containing impurities have improved strength, raw material consumption and manufacturing costs have been reduced, moldability has been significantly reduced.
After the pure titanium ingot is rolled, the grains will become vertical, and this state called "crystalline structure" is not conducive to forming. In order to solve this problem, the industry has developed processes with different running speeds of the upper and lower rolls of the rolling equipment, but this equipment needs to be reassembled, which will cause a huge economic burden.
Therefore, researchers have turned their attention to the twin phenomenon that often exists in metal materials. The pioneering new technology can effectively control the direction of material crystallization with the help of twins. The biggest feature of this technology is that it does not require additional settings on existing rolling equipment, and the crystal structure can be dispersed to improve the formability of the material. The test results confirmed that the pure titanium plate produced by the research team through this technology has significantly improved strength and formability.
Yuan Zongyou said that from the aspects of light weight, high strength, high formability and raw material saving, the pure titanium ingot rolling technology can be fully satisfied. In the future application, it is expected to have great value and effect, in addition to the traditional plate type In addition to heat exchangers, they can play their role in more areas.
Hong Chengjiu said that the twinning phenomenon is very common and fracture will occur after rolling. Therefore, it has not been applied so far. The technology developed this time can suppress the twinning fracture. If it is really applied, it can improve the material more effectively. Performance.