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  Effect of Multistage Heat Treatment on Microstructure and Mechanical Properties of High-Strength Low-Alloy Steel

Liu, Q., Wen, H., Zhang, H., Gu, J., Li, C., & Lavernia, E. J. (2016). Effect of Multistage Heat Treatment on Microstructure and Mechanical Properties of High-Strength Low-Alloy Steel. Metallurgical and Materials Transactions A, 47(5), 1960-1974. doi:10.1007/s11661-016-3389-7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-19E8-D Version Permalink: http://hdl.handle.net/21.11116/0000-0002-19E9-C
Genre: Journal Article

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 Creators:
Liu, Qingdong1, 2, Author              
Wen, Haiming1, 3, Author              
Zhang, Han4, Author              
Gu, Jianfeng1, 2, Author              
Li, Chuanwei1, 2, Author              
Lavernia, Enrique J.5, Author              
Affiliations:
1Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiaotong University, Shanghai, 200240, China, persistent22              
2Institute of Materials Modification and Modelling, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, China, persistent22              
3Characterization and Advanced PIE Division, Idaho National Laboratory, Idaho Falls, ID 83415, USA, persistent22              
4Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
5Department of Chemical Engineering and Materials Science, University of California, Davis, Davis, CA, USA, ou_persistent22              

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Free keywords: Alloy steel; Fracture toughness; High resolution transmission electron microscopy; High strength alloys; High strength steel; Nickel alloys; Tempering; Transmission electron microscopy, Atom probe tomography; Cu-rich precipitates; Electron back scatter diffraction; Heat treatment schedule; High strength low alloy steel (HSLA); High strength low alloy steels; Microstructure and mechanical properties; Reverted austenite, Impact strength
 Abstract: The influence of Cu-rich precipitates (CRPs) and reverted austenite (RA) on the strength and impact toughness of a Cu-containing 3.5 wt pct Ni high-strength low-alloy (HSLA) steel after various heat treatments involving quenching (Q), lamellarization (L), and tempering (T) is studied using electron back-scatter diffraction, transmission electron microscopy, and atom probe tomography. The QT sample exhibits high strength but low impact toughness, whereas the QL samples mostly possess improved impact toughness but moderate strength, but the QLT samples again have degraded impact toughness due to additional tempering. The dispersion of nanoscale CRPs, which are formed during tempering, is responsible for the enhanced strength but simultaneously leads to the degraded impact toughness. The RA formed during lamellarization contributes to the improved impact toughness. Based on the present study, new heat treatment schedules are proposed to balance strength and impact toughness by optimizing the precipitation of CRPs and RA. © 2016, The Minerals, Metals Materials Society and ASM International.

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Language(s): eng - English
 Dates: 2016-05-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s11661-016-3389-7
BibTex Citekey: Liu20161960
 Degree: -

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Title: Metallurgical and Materials Transactions A
  Other : Metallurgical and Materials Transactions A, Physical Metallurgy and Materials Science
  Abbreviation : Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.
Source Genre: Journal
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Publ. Info: New York, NY : Springer Sciences & Business Media
Pages: - Volume / Issue: 47 (5) Sequence Number: - Start / End Page: 1960 - 1974 Identifier: ISSN: 1073-5623
CoNE: /journals/resource/954928569608