Journal article
Analysis of a New High-Toughness Ultra-high-Strength Martensitic Steel by Transmission Electron Microscopy and Atom Probe Tomography
Metallurgical and materials transactions. A, Physical metallurgy and materials science, v 47A(4), pp 1517-1528
01 Apr 2016
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Abstract
The microstructure of a new martensitic high-strength steel (Fe-0.40C-3.81Ni-1.31Cr-1.50Si-0.75Mn-0.52Mo-0.51Cu-0.30V) with high fracture toughness is characterized by transmission electron microscopy and atom probe tomography (APT). MC, M6C, and M23C6 precipitates form inside the martensitic lath matrix. The fracture toughness is insensitive to the dissolution of M23C6 precipitates at austenitizing temperatures above 1164 K (891 A degrees C). APT reveals that solute segregation at the prior austenite grain boundaries (PAGB) is not uniform, with C, Mo, Si, Ni, and/or P enrichment varying at different areas of the PAGB. Si depletion is detected in the same area as the highest C enrichment. Carbon also segregates at lath boundaries. Segregation of C indicates the presence of retained austenite films at both PAGB and lath boundaries. Regions enriched in C up to 10 pct were found within the laths; however, no regions were enriched to the level expected of cementite or epsilon-carbide. The observed C distribution and high fracture toughness indicates that the tempering behavior is significantly different than that observed in 300M steel. The effect of Si, Ni, and Cu on the formation and stabilization of the regions of C enrichment and retained austenite require further study, as it may be key to the increased toughness.
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Details
- Title
- Analysis of a New High-Toughness Ultra-high-Strength Martensitic Steel by Transmission Electron Microscopy and Atom Probe Tomography
- Creators
- Matthew I. Hartshorne - Drexel UniversityCaroline Mccormick - Drexel UniversityMichael Schmidt - Carpenter Technology CorporationPaul Novotny - Carpenter Technology CorporationDieter Isheim - Northwestern UniversityDavid N. Seidman - Northwestern UniversityMitra L. Taheri - Drexel University
- Publication Details
- Metallurgical and materials transactions. A, Physical metallurgy and materials science, v 47A(4), pp 1517-1528
- Publisher
- Springer Nature
- Number of pages
- 12
- Grant note
- DMR-1121262 / National Science Foundation's MRSEC Program; National Science Foundation (NSF) Initiative for Sustainability and Energy at Northwestern (ISEN) DMR-0420532 / MRI Program of the National Science Foundation Carpenter Technology Corporation 1150807 / National Science Foundation's Faculty Early Career Development Program N00014-0400798; N00014-0610539; N00014-0910781 / DURIP program of the Office of Naval Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000371307400005
- Scopus ID
- 2-s2.0-84961286717
- Other Identifier
- 991019174741204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering