Korea develops high tensile strength lightweight steel

Abstract As the demand for new energy vehicles continues to increase in the future, the lightweight steel structure used in automobile bodies has become an important issue in the industry. Pohang University of Science and Technology, Korea...
As the demand for new energy vehicles continues to increase in the future, the lightweight steel structure used in automobile bodies has become an important issue in the industry. Researchers at Pohang University of Science and Technology (POSTECH) have recently developed a new high-strength, lightweight steel that is expected to be used in automotive materials manufacturing.
According to POSTECH researchers, titanium alloys are known to be the lightest and highest quality metal materials, while new steels have been improved on titanium alloys for greater tensile strength and flexibility, the British magazine Nature. Nature also explains how new steels are designed using alloys containing metal compounds.
In general, metallurgists can press steel by modifying the morphology of the metal compound B2 and the dispersion in the steel matrix, and researchers are effectively using the metal compound B2. The characteristics have developed a new high tensile strength steel.
Previously, researchers have said that the strength-to-weight ratio (ie, the strength factor) of heavy steel is low and that other materials need to be replaced. High-aluminium low-density steels are still in the research stage. The material increases the alloy strength coefficient by reducing the density and increasing the aluminum content, but its flexibility is poor.
POSTECH researchers have experimented with metal by modifying the elemental composition of austenitic low-density steel, including iron, aluminum, manganese and carbon, and 5% nickel (Ni). Stability of Compound B2.
Researchers have also found that after heat treatment of cold-rolled steel sheets, nickel alloys can be used as catalysts to precipitate B2 nanoparticles in a face-centered cubic matrix of high-aluminum low-density steel. In the second stage, the flexibility of the high aluminum content low density steel material is achieved by controlling the morphology of the metal compound B2 and the dispersed particles in the steel matrix composite.
Industry analysts say that traditional heavy-duty steel is becoming more and more outdated, and lightweight structural steel will become the trend. At present, in the light vehicle market, the share of vehicles using heavy steel is gradually decreasing, from 68.1% in 1995 to 60.1% in 2011.
In the future, car lightweighting may become a highlight of the automotive industry, and POSTECH Research Institute will also cooperate with POSCO Steel Co., Ltd. at the end of this year to produce new high tensile strength lightweight steel and apply it. To more new energy vehicles.

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