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posted by Fnord666 on Sunday August 27 2017, @01:02PM   Printer-friendly
from the men-of-steel dept.

http://www.hku.hk/press/news_detail_16681.html

A Hong Kong-Beijing-Taiwan mechanical engineering team led by Dr Huang Mingxin from the University of Hong Kong (HKU) has recently developed a Super Steel (also called D&P Steel as it adopted a new deformed and partitioned (D&P) strategy) which addressed the strength-ductility trade-off. Its material cost is just one-fifth of that of the steel used in the current aerospace and defence applications. This research breakthrough is recently published in the prestigious academic journal Science.

[...] In addition to the substantial improvement of tensile properties, this breakthrough steel has achieved the unprecedented yield strength of 2.2 GPa and uniform elongation of 16%. Additionally, this breakthrough steel has two advantages:

(1). Low raw-materials cost.

The raw materials cost of the D&P steel is only 20% of the maraging steel used in aerospace and defence applications. The chemical composition of this breakthrough steel belongs to the system of medium manganese (Mn) steel, containing 10% manganese, 0.47% carbon, 2% aluminium, 0.7% vanadium (mass percent), and the balance is iron. No expensive alloying elements have been used exhaustively but just some common alloying compositions that can be widely seen in the commercialized steels. Figure 1[1] compares the raw materials cost between the present D&P steel with other high-strength steels.

(2). Simple industrial processing

The second advantage is that this breakthrough steel can be developed using conventional industrial processing routes, including warm rolling, cold rolling and annealing. This is different from the development of other metallic materials where the fabrication processes involve complex routes and special equipment, which are difficult to scale-up. Therefore, it is expected that the present breakthrough steel has a great potential for industrial mass production.

[1] Figure 1.

Maraging steels.

High dislocation density–induced large ductility in deformed and partitioned steels (open, DOI: 10.1126/science.aan0177) (DX)


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  • (Score: 5, Informative) by RamiK on Sunday August 27 2017, @02:38PM

    by RamiK (1813) on Sunday August 27 2017, @02:38PM (#559854)

    Maraging steels are typically applied to produce missile and rocket motor cases, wind tunnel models, recoil springs, flexures, AC Motors, landing gear components, high performance shafting gears and fasteners, extrusion tools, casting dies, and core pins. Engine components such as crankshafts and gears that work at warm temperatures and the firing pins of automatic weapons that cycle from hot to cool repeatedly while under substantial loads and impacts are made from maraging steels. Their uniform expansion and ease machinability characteristics makes it useful in high wear portions of assembly lines and as well as in die manufacturing.

    http://www.france-metallurgie.com/introduction-to-metallurgy-of-maraging-steels-us/ [france-metallurgie.com]

    I hate using that word, but it really sounds like a breakthrough.

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