Light iron flash bainite. Free Technical Library News

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Light iron flash bainite

23.12.2015

The iron-carbon alloy bainite (aka acicular troostite) is an acicular structure of steel formed during heat treatment as a result of the so-called intermediate transformation of austenite, and consists of a mixture of particles of ferrite supersaturated with carbon and iron carbide. (After mastering so many different "-its" it becomes clear why the billionaires M. Fridman and V. Rashnikov left metallurgical universities - a good head is required).

A self-taught American metallurgist, Gary Cola, is about to become a billionaire (or at least a millionaire), who almost five years ago approached scientists at Ohio State University and said he had figured out a way to increase the strength of steel by seven percent. After a fair amount of skepticism, the engineers agreed to test the alloy shown by Cola, and it turned out that it was so. Moreover, the material, named by the inventor of Flash Bainite, can be stretched in length and made thinner by 30% compared to martensite - the main structural component of hardened steel, which is an ordered supersaturated solid solution of carbon in a-iron of the same concentration as that of the original austenite. .

The process invented by Cola differs from the traditional one in that ordinary steel during manufacture undergoes heat treatment at a temperature of about 900 ° C for several hours, or even days. In the "flash bainite" process, sheets of steel are rolled through a 1100°C flame and then immersed in a cooling bath in 10 seconds. In addition to being an incredible time saver, the durable "flash bainite" can be pressed into complex automotive shapes just as well as the widely used DP1180 duplex steel. But "flash-bainite" is 25% stronger.

In 2011, the material was tested by the US Army, and in 2013, Gary Cola entered into test contracts with several leading automotive companies (which is not specified due to confidentiality provisions). And the inventor has just agreed with another manufacturer to use "flash-bainite" tubes for shockproof safety beams in car doors and other structural elements. The use of Flash Bainite should result in savings of over 30%.

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