Economy

Researchers Claim ‘Super Steel’ Solves Strength-Ductility Tradeoff
Written by Tim Triplett
August 25, 2017
Researchers in Asia claim they have developed a new way to make steel that offers a high degree of strength without sacrificing ductility, creating a strong but formable material that could prove useful in the production of lighter, more fuel-efficient vehicles, among many other applications.
Typically, making steel stronger decreases its formability. The Hong Kong-Beijing-Taiwan mechanical engineering team led by Dr. Huang Mingxin from the University of Hong Kong says it has developed a “Super Steel” that addresses this strength-ductility trade-off.
In their paper published in the journal Science, the research team describes the process used to make the new type of steel. It employs a new deformed and partitioned (D&P) process that involves cold rolling followed by low-temperature annealing. Details of the process are confidential. The material that results is made with 0.47 percent carbon, 10 percent manganese, 0.7 percent vanadium and 2.0 percent aluminum. Metastable austenite grains embedded during the process helps the steel retain ductility.
The “breakthrough” material offers a yield strength of 2.2 GPa and 16 percent uniform elongation, which would make it the best in its class. Compared with widely used automotive steels, such as DP780 and Q&P980, as well as maraging steel used in aerospace and defense, the D&P steel demonstrates a much higher yield strength while maintaining much better ductility, the researchers claim.
In addition to offering improved physical properties, the material can be produced at just one-fifth the cost of steel currently used in many aerospace and defense applications. The new technique utilizes low-cost raw materials and conventional industrial processes, which gives it great potential for industrial mass production, say its developers.

Tim Triplett
Read more from Tim TriplettLatest in Economy

Architecture billings continue to slide in March
Architecture firms said billings continued to decline in March, according to the latest Architecture Billings Index (ABI) released by the American Institute of Architects (AIA) and Deltek.

Beige Book shows concerns about trade policy
Manufacturing was mixed, but two-thirds of districts said activity was little changed or had declined.

New York state manufacturing index drops again in April
Firms were pessimistic, with the future general business conditions index falling to its second lowest reading in the more than 20-year history of the survey

Construction adds 13,000 jobs in March
The construction sector added 13,000 jobs, seasonally adjusted, in March, but tariffs could undermine the industry.

Supply chains, end-users brace for impact from tariffs
Supply chains are working through what the tariffs mean for them