A novel low cost 2000 MPa grade ultra-high strength steel with balanced strength and toughness

Y. H. Gao, S. Z. Liu, X. B. Hu, Q. Q. Ren, Y. Li, Vinayak P. Dravid, C. X. Wang

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

A novel low cost martensitic based ultra-high strength steel (UHSS) with a tensile strength of 2020 MPa and fracture toughness of 105 MPa m1/2 achieved by nanoscale β-NiAl and M2C precipitates was developed. The strength and toughness of this experimental alloy are comparable to those of the commercially used UHSSs strengthened by only M2C carbides. However, the raw materials cost of this experimental steel is greatly reduced because of low Ni–Co concentration.

Original languageEnglish
Pages (from-to)298-302
Number of pages5
JournalMaterials Science and Engineering: A
Volume759
DOIs
StatePublished - Jun 24 2019
Externally publishedYes

Funding

This work made use of the EPIC facility of Northwestern University’s NU ANCE Center , which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource ( NSF ECCS-1542205 ); the MRSEC program ( NSF DMR-1720139 ) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. The APT work made use of facility in Northwestern University Center for Atom Probe Tomography (NUCAPT). Atom probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The LEAP tomography at NUCAPT was purchased and upgraded with grants from the NSF-MRI ( DMR-0420532 ) and ONR-DURIP ( N00014-0400798 , N00014-0610539 , N00014-0910781 , N00014-1712870 ) programs. NUCAPT received support from the MRSEC program ( NSF DMR-1720139 ) at the Materials Research Center, the SHyNE Resource (NSF ECCS-1542205), and the Initiative for Sustainability and Energy (ISEN) at Northwestern University. X.H. is thankful to Prof. David N. Seidman for the fruitful discussion.

Keywords

  • Low cost
  • MC secondary carbides
  • Martensitic steels
  • Ultra high strength-facture toughness balance
  • β-NiAl particles

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