The mechanisms of hot salt stress corrosion cracking in titanium alloy Ti-6Al-2Sn-4Zr-6Mo
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Published version
Author(s)
Joseph, S
Lindley, TC
Dye, D
Saunders, Edward A
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.
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.
Date Issued
2018-04-15
Date Acceptance
2018-02-16
Citation
Corrosion Science, 2018, 134, pp.169-178
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
Engineering & Physical Science Research Council (EPSRC)
Rolls-Royce Plc
Rolls-Royce Deutschland Ltd & CoKG
Grant Number
EP/K034332/1
PO 4600203311
PO 9900058948
Subjects
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
Date Publish Online
2018-02-20