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  Effect of molybdenum addition on the precipitation of carbides in the austenite matrix of titanium micro-alloyed steels

Wang, Z., Zhang, H., Guo, C., Liu, W., Yang, Z., Sun, X., et al. (2016). Effect of molybdenum addition on the precipitation of carbides in the austenite matrix of titanium micro-alloyed steels. Journal of Materials Science, 51(10), 4996-5007. doi:10.1007/s10853-016-9804-z.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-1A49-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-1A4A-F
Genre: Journal Article

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 Creators:
Wang, Zhenqiang1, Author              
Zhang, Han2, Author              
Guo, Chunhuan1, Author              
Liu, Wenbo3, Author              
Yang, Zhigang4, Author              
Sun, Xinjun5, Author              
Zhang, Zhengyan5, Author              
Jiang, Fengchun1, Author              
Affiliations:
1Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China, persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3Tsinghua University, Key Laboratory of Advanced Materials, Department of Material Science & Engineering, Beijing 100084, China, persistent22              
4Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Haidian District, Beijing, China, persistent22              
5Central Iron and Steel Research Institute, No. 76, Xueyuan Nanlu, Beijing, China, persistent22              

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Free keywords: Austenite; Carbides; Chemical analysis; Compression testing; Crystal microstructure; Free energy; Gibbs free energy; Microalloying; Precipitation (chemical); Titanium alloys; Titanium carbide, Chemical phase analysis; Deformation microstructure; Double pass compression tests; Initial stage of precipitation; Interfacial chemicals; Precipitation behavior; Precipitation kinetics; Recovery and recrystallization, Molybdenum compounds
 Abstract: The present work aims to reveal the effect of Mo on the precipitation behavior of MC-type (M = Ti and Mo) carbides in the austenite matrix of titanium micro-alloyed steel. The precipitation start-time–temperature curve was determined by a double-pass compression test on a Gleeble simulator, and the elemental mass fraction of MC-type carbides was measured by a physical–chemical phase analysis after a single-pass rolling test. The results shows that 0.2 wt Mo accelerates the precipitation kinetics of MC-type carbides. During the initial stage of precipitation, Mo tends to distribute in the outer region of precipitates by replacing Ti despite of the high solubility of MoC in austenite. The replacement of Ti by Mo in TiC lattice leads to two opposite effects: First, it restrains MC precipitation due to the higher Gibbs free energy of (Ti, Mo)C relative to TiC; Second, it promotes MC precipitation by decreasing the interfacial chemical energy of MC/austenite system. The second effect is more pronounced during the initial stage of precipitation when MC precipitates are relatively small and hence MC precipitation is accelerated by Mo addition. Compared to TiC, (Ti, Mo)C with stronger coarsening resistance suppresses austenite recovery and recrystallization more effectively, which favors maintaining the deformation microstructures at high temperatures. © 2016, Springer Science+Business Media New York.

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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/s10853-016-9804-z
BibTex Citekey: Wang20164996
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Title: Journal of Materials Science
  Abbreviation : JMS
Source Genre: Journal
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Publ. Info: New York, NY, USA : Springer
Pages: - Volume / Issue: 51 (10) Sequence Number: - Start / End Page: 4996 - 5007 Identifier: ISSN: 0022-2461
CoNE: /journals/resource/954925415936_1