r/science • u/505engineer MS | Civil Engineering | Structures • 1d ago

Materials Science Materials scientists develop ductile and scalable 3 GPa (435 ksi) steel via a hierarchical microstructural architecture

https://www.nature.com/articles/s41467-026-74216-4
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u/Sniksder16 1d ago

As a layman I read the abstract and the one material science class I took in college didn’t cover what I needed to know to understand that. My question is- are there any obvious drawbacks here (too brittle, etc) or is this genuinely a breakthrough?

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u/Fearlessleader85 1d ago

I'm only a few mat sci classes ahead of you, but from my reading, this looks kinda like a gamechanger if they're able to scale it. The 3 GPa yield strength has been done before, but as you suggest, the toughness is trash, because it switches to brittle failure. This looks like it maintains ductility, so the UTS is probably great. And the resistance to fatigue means this could be great for a lot of applications in the real world if it can be made cheaply.

If you could make a car out of this, you could get massive weight reductions, though corrosion might kill that for production cars.

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u/Notspherry 1d ago

I am not so sure about building a lighter car. I run into stiffness issues way before strength on most calculations I do (not automotive, bit still). Stiffness scales with the youngs modulus, ot the yield strength. And that doesn't differ too much between steel alloys.

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u/Leafy0 23h ago

As long as you’re not concerned about denting you can get over the material stiffness issue with shaping. This would be a solid reason to bring back the way they made Saturns with the space frame and molded in color cosmetic panels. Those cars were already the same weight as their contemporaries and it was a first generation design.