Commercially viable strong steel with a grain size of just 0.4 µm

A lecture delivered at the Future Metallugy Forum, organised by Professor Zhongyun Fan who is also the Director of the EPSRC Liquid Metal Engineering hub at Brunel University.
The idea that strong high-carbon martensite is brittle in its virgin condition is embedded firmly in metallurgical convention. The brittleness is apparent in optical microscopy that reveals periodic cracking. The cracks are not caused by the application of an external stress, but form spontaneously under the influence of thermal or transformation stresses, as the microstructure evolves.
The tendency for such cracking diminishes as the austenite grain size is reduced. This is because it becomes difficult to transfer stress on to an individual martensite plate as its dimensions decrease.
The talk shows how to achieve a dramatic decrease in the crystallographic grain size so that strength and toughness can coexist in harmony.
This recording has kindly been provided by the organisers of the Future Metallurgy meeting.
www.phase-tran...

[@PCMcGee1]

Thanks for sharing, always interested to see your presentations.

[@bhadeshia123]

You are very welcome, thank you for your interest.

[@buchibabuvicharapu204]

Many thanks for sharing such a lovely talks made available for public, most importantly for aspiring researchers

[@bhadeshia123]

You are very welcome. You can find more relevant materials freely available on
www.phase-trans.msm.cam.ac.uk/

[@kknives_switzerland]

Very interesting as always!

[@bhadeshia123]

You are very welcome. More information available freely on www.phase-trans.msm.cam.ac.uk/2019/abrasion.html

[@SubhankarDasbakshi]

Nice talk Harry !

[@bhadeshia123]

Thank you, Subhankar.

[@muka2024]

Great talk! Has this work been published in a paper?

[@bhadeshia123]

Yes, www.phase-trans.msm.cam.ac.uk/2019/abrasion.html

[@fitkudzi]

@@bhadeshia123 Have you done any hydrogen embrittlment tests on this material?

[@paulmeersa7162]

Ooooph. Harry!

[@bhadeshia123]

?

[@paulmeersa7162]

@@bhadeshia123 It was just the significance of this steel to industry Harry and that you "designed" it from scratch - forgive the pun. That is amazing to me. Bis 80 in Australia is used as a wear resistant plate in the earthmoving and mining industry. I imagine this new steel will replace Bis 80 and that market is quite large. Hence the Ooooph! There is a lot of money in this additional wear resistance and easy fabrication ability of this new material. The other factor is understanding how you manipulate iron allotropy and chemistry to your advantage, that is real Engineering Dr, Sir!!

[@bhadeshia123]

Thank you, now I understand. If you are interested, you can download my latest book free-of-charge from www.phase-trans.msm.cam.ac.uk/2023/Theory_Transformations_Steel.pdf
and there is a lot more available at
www.phase-trans.msm.cam.ac.uk/
Best wishes, Harry@@paulmeersa7162

[@paulmeersa7162]

@@bhadeshia123 I did that yesterday thanks Harry, I was the bloke asking about the invariant-plane strain on the Pearlite Steels lecture. I am working my way through both of Linnert's Welding Metallurgy volumes, slowly but surely, just out of interest, not doing any course, although I might try for a Welding Engineering exam or two in the Northern hemisphere in a year or two. I use your lectures on here for a booster, and or a different perspective once reading up on it all becomes too much - helps a lot! Once I am done with Linnert I'll switch over to more of your lectures and might even try a chapter or two from your books. I was always told throughout my career that I should have been a metallurgist; but I'd rather study alone away from institutions so this type of learning suits me well.
It seems such a pity that you have retired but at least you are maintaining a presence on line, for that I am grateful. Many thanks for the work you have done in carrying ford man's understanding of metals... M.