Journal
SCIENCE
Volume 368, Issue 6497, Pages 1347-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aba9413
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Funding
- National Key Research and Development Program of China [2019YFA0209900, 2017YFB0304401]
- National Natural Science Foundation of China [U1764252]
- Research Grants Council of Hong Kong [R7066-18, 17255016, 17210418]
- Mechanical Behavior of Materials Program (KC13) at the Lawrence Berkeley National Laboratory (LBNL) by U.S.Department of Energy, Office of Science, Basic EnergySciences, Materials Sciences and Engineering Division [DE-AC02-05-CH112E31B]
- Office of Science, Office of Basic EnergySciences, of the U.S.Department of Energy [DE-AC02-05-CH112E31B]
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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.
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