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The mechanisms of hot salt stress corrosion cracking in titanium alloy Ti-6Al-2Sn-4Zr-6Mo

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Title: The mechanisms of hot salt stress corrosion cracking in titanium alloy Ti-6Al-2Sn-4Zr-6Mo
Authors: Joseph, S
Lindley, TC
Dye, D
Saunders, EA
Item Type: Journal Article
Abstract: Hot salt stress corrosion cracking in Ti 6246 alloy has been investigated to elucidate the chemical mechanisms that occur. Cracking was found to initiate beneath salt particles in the presence of oxidation. The observed transgranular fracture was suspected to be due to hydrogen charging; XRD and high-resolution transmission electron microscopy detected the presence of hydrides that were precipitated on cooling. SEM-EDS showed oxygen enrichment near salt particles, alongside chlorine and sodium. Aluminium and zirconium were also involved in the oxidation reactions. The role of intermediate corrosion products such as Na 2 TiO 3 , Al 2 O 3 , ZrO 2 , TiCl 2 and TiH are discussed.
Issue Date: 15-Apr-2018
Date of Acceptance: 16-Feb-2018
URI: http://hdl.handle.net/10044/1/57268
DOI: https://dx.doi.org/10.1016/j.corsci.2018.02.025
ISSN: 0010-938X
Publisher: Elsevier
Start Page: 169
End Page: 178
Journal / Book Title: Corrosion Science
Volume: 134
Copyright Statement: © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Rolls-Royce Plc
Rolls-Royce Deutschland Ltd & CoKG
Funder's Grant Number: EP/K034332/1
PO 4600203311
PO 9900058948
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Titanium
STEM
X-ray diffraction
Hot corrosion
Hydrogen embrittlement
Stress corrosion
IMI 834
ALPHA-TITANIUM
BETA-TITANIUM
MODEL
cond-mat.mtrl-sci
0912 Materials Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Energy
Publication Status: Published
Online Publication Date: 2018-02-20
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering