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  Preliminary creep testing of the alumina-forming austenitic stainless steel Fe-20Cr-30Ni-2Nb-5Al

Baker, I., Afonina, N., Wang, Z., & Wu, M. (2018). Preliminary creep testing of the alumina-forming austenitic stainless steel Fe-20Cr-30Ni-2Nb-5Al. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 718, 492-498. doi:10.1016/j.msea.2018.01.090.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E80E-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E80F-A
Genre: Journal Article

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 Creators:
Baker, Ian1, Author              
Afonina, Natalie1, 2, Author              
Wang, Zhangwei1, 3, Author              
Wu, Margaret1, Author              
Affiliations:
1Thayer School of Engineering, Dartmouth College, Hanover, NH, USA, persistent22              
2Uber Technologies Inc., 555 Market St, 17th Floor, San Francisco, CA, USA, persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Alumina; Aluminum; Aluminum alloys; Austenitic stainless steel; Binary alloys; Characterization; Chromium alloys; Cracks; Creep; Grain boundaries; Heat treatment; Iron alloys; Nickel; Nickel alloys; Niobium alloys; Particle size; Precipitates; Precipitation (chemical); Stainless steel; Steel testing; Tensile testing, As cast alloy; Constant stress; Different sizes; Grain boundary coverage; Grain boundary cracking; Heat-treated materials; Heat-treated specimens; Micro-structural characterization, Creep testing
 Abstract: The alumina-forming austenitic stainless steel Fe-20Cr-30Ni-2 Nb-5Al was given a solutionizing anneal at 1250 °C followed by anneals at 800 °C for 0, 2.4, 24, 240 h to produce B2 (ordered b.c.c.) and Laves phase precipitates of different sizes with different extents of grain boundary coverage. Both tensile tests and constant-stress (43 MPa) creep tests were performed on the heat-treated materials and on the as-cast alloy at 760 °C. The precipitates grew during the creep testing. In addition, L12 (ordered f.c.c.) precipitates nucleated and grew during the creep testing to similar particle sizes after 500 h independent of the prior heat treatment at 800 °C. The specimens given the shortest heat treatment of 2.4 h, which had the smallest initial particle sizes, showed both the highest yield strength and the smallest creep strain after 500 h. The extent of grain boundary coverage by precipitates did not appear to affect the creep rates. No grain boundary cracking or precipitate cracking was found in the heat-treated specimens after creep testing, but the as-cast material failed around 600 h. © 2018 Elsevier B.V.

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Language(s): eng - English
 Dates: 2018-03-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.msea.2018.01.090
BibTex Citekey: Baker2018492
 Degree: -

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Title: Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
  Abbreviation : Mater. Sci. Eng. A: Struct. Mater. Prop. Microstruct. Process.
Source Genre: Journal
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Publ. Info: New York, NY : Elsevier
Pages: - Volume / Issue: 718 Sequence Number: - Start / End Page: 492 - 498 Identifier: ISSN: 0921-5093
CoNE: https://pure.mpg.de/cone/journals/resource/954928498465_1