Science· 2020Q1
Making ultrastrong steel tough by grain-boundary delamination
- 477citations
- Q1SCImago
- 2020year
Short summary
Researchers have developed a novel strategy to enhance the toughness of ultrahigh-strength steel, achieving nearly 2 gigapascals yield strength while improving fracture resistance through controlled grain-boundary delamination.
AI-generated from the title and abstract; the full text is not read.
Key points
- Achieved ultrahigh yield strength of nearly 2 GPa in steel.
- Introduced 'delamination toughening' via controlled cracking at manganese-enriched grain boundaries.
- Transformed plane-strain fracture into parallel plane-stress fracture processes.
- Strategy offers a cost-effective route to ultrahigh strength and superior toughness.
AI-generated from the title and abstract; the full text is not read.
Abstract
Developing ultrahigh-strength steels that are ductile, fracture resistant, and cost effective would be attractive for a variety of structural applications. We show that improved fracture resistance in a steel with an ultrahigh yield strength of nearly 2 gigapascals can be achieved by activating delamination toughening coupled with transformation-induced plasticity. Delamination toughening associated with intensive but controlled cracking at manganese-enriched prior-austenite grain boundaries normal to the primary fracture surface dramatically improves the overall fracture resistance. As a result, fracture under plane-strain conditions is automatically transformed into a series of fracture processes in "parallel" plane-stress conditions through the thickness. The present "high-strength induced multidelamination" strategy offers a different pathway to develop engineering materials with ultrahigh strength and superior toughness at economical materials cost.
The authors' abstract, as published at the source. Science, 2020 · DOI ↗
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Field: Metals and Alloys
Metals and AlloysMaterials Science