Category: English | 08 Июнь 2022
The unique alloy, which has no analogues in strength and ductility at extremely low temperatures, was developed by scientists of the National Research University "BelSU". According to them, the material is also economical and will find wide application in systems necessary for space exploration, the World Ocean, the Arctic and Antarctica. The results are published in the journal Materials Science and Engineering.
For the manufacture of systems designed to operate at extremely low temperatures, so-called austenitic steels are used today. According to experts, their strength, plasticity and other mechanical properties are often insufficient – for example, for functioning in outer space or for creating critical elements of cryogenic technology.
Scientists of the Belgorod State National Research University have obtained a promising alloy based on iron, cobalt, nickel, chromium and carbon, which, according to them, has outstanding properties at temperatures up to -150 °With and below.
"Our alloy surpasses all commercial analogues in its characteristics both at room and cryogenic temperatures. At the temperature of liquid nitrogen, -196 ° C, it is one and a half times stronger than the best analog and has excellent plasticity of 24 percent. In combination with excellent fracture toughness, this gives an optimal balance of mechanical properties," said Dmitry Shaisultanov, senior researcher at the National Research University "BelSU".
According to him, the presence of carbon and increased iron content contribute to an additional increase in strength and reduce the cost of the material. The high mechanical properties of the alloy are provided, as scientists explained, by the so-called TRIP effect. It consists in a significant increase in strength and plasticity due to changes in the crystal structure of the material during cold plastic deformation.
"Such alloys are attractive because of their ability to be processed by deep drawing, as a result of which thin-walled hollow parts of increased strength are obtained. Also, their use opens up a wide range of possibilities for systems designed for extremely low temperatures — primarily in the exploration of outer space and airspace, the World Ocean, the Arctic and Antarctica," Dmitry Shaisultanov said.
The data obtained in the course of the study expand the understanding of the mechanisms that determine the behavior of alloys with TRIP effects in various conditions. This will make it possible to make a more accurate choice of materials and processing technologies to create products with the necessary complex of mechanical properties, the scientists explained.
Further research of the research team is aimed at adapting the new alloy to industrial 3D printing technologies.
Source: RIA Novosti