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Title: | Synergy of strengthening and toughening of a Cu-rich precipitate-strengthened steel | Authors: | Wei, X Cao, X Luan, JH Jiao, ZB Liu, CT Zhang, ZW |
Issue Date: | Jan-2022 | Source: | Materials science and engineering. A, Structural materials : properties, microstructure and processing, Jan. 2022, v. 832, 142487 | Abstract: | A high strength steel with a combination of ∼930 MPa yield strength and excellent low temperature toughness with an upper shelf energy of above 200 J and ductile brittle transition temperature (DBTT) of lower than −90 °C is developed. The strengthening and toughening mechanisms are investigated systematically based on the detailed characterization on microstructures including the matrix and precipitates. The results indicate that the steel is composed of a fine lath martensite with rod-like Cu precipitates. The high strength is achieved by a combination of solid-solution strengthening, dislocation strengthening, grain boundary strengthening and precipitation strengthening of Cu-precipitates. The instrumented Charpy impact results further indicate that the crack propagation is the main factor affecting DBTT while the dislocation density has an obvious effect on both crack initiation and propagation. The fine lath structure of the low carbon martensite enhances the crack resistance and delays the rapid unstable crack propagation at low temperatures. Both the strengthening and toughening are thoroughly discussed in details. | Keywords: | Crack propagation Ductile-brittle transition Impact toughness Nanoprecipitate-strengthened steel Strengthening mechanisms |
Publisher: | Elsevier | Journal: | Materials science and engineering. A, Structural materials : properties, microstructure and processing | ISSN: | 0921-5093 | EISSN: | 1873-4936 | DOI: | 10.1016/j.msea.2021.142487 | Rights: | © 2021 Elsevier B.V. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Wei, X., Cao, X., Luan, J. H., Jiao, Z. B., Liu, C. T., & Zhang, Z. W. (2022). Synergy of strengthening and toughening of a Cu-rich precipitate-strengthened steel. Materials Science and Engineering: A, 832, 142487 is available at https://dx.doi.org/10.1016/j.msea.2021.142487. |
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Wei_Synergy_Cu-rich_Precipitate-strengthened.pdf | Pre-Published version | 2.56 MB | Adobe PDF | View/Open |
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