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  Effects of Carbon Variation on Microstructure Evolution in Weld Heat-Affected Zone of Nb–Ti Microalloyed Steels

Ma, X., Li, X., Langelier, B., Gault, B., Subramanian, S., & Collins, L. (2018). Effects of Carbon Variation on Microstructure Evolution in Weld Heat-Affected Zone of Nb–Ti Microalloyed Steels. Metallurgical and Materials Transactions A, 49(10), 4824-4837. doi:10.1007/s11661-018-4751-8.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E5C4-F Version Permalink: http://hdl.handle.net/21.11116/0000-0002-5F4A-2
Genre: Journal Article

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 Creators:
Ma, Xiaoping1, 2, Author              
Li, Xueda3, Author              
Langelier, Brian2, Author              
Gault, Baptiste4, Author              
Subramanian, Sundaresa2, Author              
Collins, Laurie5, Author              
Affiliations:
1Algoma Steel Inc., Sault Ste. Marie, Canada, ou_persistent22              
2Department of Materials Science and Engineering, McMaster University, Hamilton, Canada, ou_persistent22              
3College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao, China, ou_persistent22              
4Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
5EVRAZ North America, Regina, Canada, ou_persistent22              

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Free keywords: Austenite; Bainite; Binary alloys; Heat affected zone; Microalloying; Microstructure; Niobium compounds; Steel metallography; Steel pipe; Titanium alloys, Coarse grained heat affected zone; Concentration variation; Crystallographic variants; Inter-particle spacing; Micro-structure evolutions; Nb microalloyed steels; Nb-ti microalloyed steels; Weld heat-affected zone, Niobium alloys
 Abstract: We investigated the effects of C concentration variation from 0.028 to 0.058 wt pct on microstructure of the coarse grained heat-affected zone (CGHAZ) of low heat input girth welded Ti-Nb microalloyed steels by using electron microscope and atom probe tomography. It is found that the CGHAZ microstructure exhibits a systematic response to C variation. Increased C raises the temperature for precipitation of NbC. This leads to coarser (Ti, Nb)N-Nb(C, N) but finer delayed strain-induced NbC in the high-C steel than in the low-C steel. Fine strain-induced NbC are ineffective in preventing austenite grain coarsening in CGHAZ due to their fast dissolution upon heating. For a given inter-particle spacing originally determined by (Ti, Nb)N particles, increased epitaxial growth of Nb(C, N) on pre-existing (Ti, Nb)N in the high-C steel results in a smaller austenite grain size of 34 µm in the CGHAZ of the high-C steel than that of 52 µm in the low-C steel. Increased C promotes a microstructure consisting of bainitic lath structure with C Cottrell atmospheres at dislocation debris and martensitic layers of 30 to 100 nm in thickness at inter-lath boundaries in the CGHAZ. Increased C promotes configuration of crystallographic variants belonging to different Bain groups in the neighbors, preferentially twin-related variant pairs within a bainite packet. © 2018 The Minerals, Metals Materials Society and ASM International

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Language(s): eng - English
 Dates: 2018-07-052018-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s11661-018-4751-8
BibTex Citekey: Ma20181
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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: 14 Volume / Issue: 49 (10) Sequence Number: - Start / End Page: 4824 - 4837 Identifier: ISSN: 1073-5623
CoNE: /journals/resource/954928569608