Lead-Induced Stress Corrosion Cracking (PbSCC) initiation in Alloy 690TT in caustic environment

Giulia Mazzei; M. Grace Burke; D. A. Horner; Fabio Scenini

doi:10.1016/j.corsci.2022.110475

Lead-Induced Stress Corrosion Cracking (PbSCC) initiation in Alloy 690TT in caustic environment

Giulia Mazzei
, M. Grace Burke
, D. A. Horner
, Fabio Scenini

Materials Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Pb-Caustic Stress Corrosion Cracking initiation was studied on Alloy 690TT at 315°C. Advanced electron microscopy techniques revealed that cracking mainly initiated intergranularly following the oxidation of Cr-rich grain boundary carbides. This finding explains the higher resistance to crack nucleation of the as-received surfaces compared to polished ones, because the grain boundaries of the ultrafine-grained near-surface layer were not decorated with carbides. It is also proposed that dislocation entanglements, typical of a cold-worked surface, attenuated the emission of dislocations at the surface. Once initiated, cracking continued due to Pb incorporation in the oxide, which weakened the passive layer and enhanced slip dissolution.

Original language	English
Article number	110475
Journal	Corrosion Science
Volume	206
Early online date	22 Jul 2022
DOIs	https://doi.org/10.1016/j.corsci.2022.110475
Publication status	Published - 1 Sept 2022

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Henry Royce Institute

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title = "Lead-Induced Stress Corrosion Cracking (PbSCC) initiation in Alloy 690TT in caustic environment",

abstract = "Pb-Caustic Stress Corrosion Cracking initiation was studied on Alloy 690TT at 315°C. Advanced electron microscopy techniques revealed that cracking mainly initiated intergranularly following the oxidation of Cr-rich grain boundary carbides. This finding explains the higher resistance to crack nucleation of the as-received surfaces compared to polished ones, because the grain boundaries of the ultrafine-grained near-surface layer were not decorated with carbides. It is also proposed that dislocation entanglements, typical of a cold-worked surface, attenuated the emission of dislocations at the surface. Once initiated, cracking continued due to Pb incorporation in the oxide, which weakened the passive layer and enhanced slip dissolution. ",

author = "Giulia Mazzei and Burke, \{M. Grace\} and Horner, \{D. A.\} and Fabio Scenini",

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doi = "10.1016/j.corsci.2022.110475",

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T1 - Lead-Induced Stress Corrosion Cracking (PbSCC) initiation in Alloy 690TT in caustic environment

AU - Mazzei, Giulia

AU - Burke, M. Grace

AU - Horner, D. A.

AU - Scenini, Fabio

PY - 2022/9/1

Y1 - 2022/9/1

N2 - Pb-Caustic Stress Corrosion Cracking initiation was studied on Alloy 690TT at 315°C. Advanced electron microscopy techniques revealed that cracking mainly initiated intergranularly following the oxidation of Cr-rich grain boundary carbides. This finding explains the higher resistance to crack nucleation of the as-received surfaces compared to polished ones, because the grain boundaries of the ultrafine-grained near-surface layer were not decorated with carbides. It is also proposed that dislocation entanglements, typical of a cold-worked surface, attenuated the emission of dislocations at the surface. Once initiated, cracking continued due to Pb incorporation in the oxide, which weakened the passive layer and enhanced slip dissolution.

AB - Pb-Caustic Stress Corrosion Cracking initiation was studied on Alloy 690TT at 315°C. Advanced electron microscopy techniques revealed that cracking mainly initiated intergranularly following the oxidation of Cr-rich grain boundary carbides. This finding explains the higher resistance to crack nucleation of the as-received surfaces compared to polished ones, because the grain boundaries of the ultrafine-grained near-surface layer were not decorated with carbides. It is also proposed that dislocation entanglements, typical of a cold-worked surface, attenuated the emission of dislocations at the surface. Once initiated, cracking continued due to Pb incorporation in the oxide, which weakened the passive layer and enhanced slip dissolution.

U2 - 10.1016/j.corsci.2022.110475

DO - 10.1016/j.corsci.2022.110475

M3 - Article

SN - 0010-938X

VL - 206

JO - Corrosion Science

JF - Corrosion Science

M1 - 110475

ER -

Lead-Induced Stress Corrosion Cracking (PbSCC) initiation in Alloy 690TT in caustic environment

Abstract

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