The mechanisms of hot salt stress corrosion cracking in titanium alloy Ti-6Al-2Sn-4Zr-6Mo
Sudha Joseph, Trevor C Lindley, David Dye, Edward A Saunders
TL;DR
This study investigates the chemical mechanisms behind hot salt stress corrosion cracking in Ti-6Al-2Sn-4Zr-6Mo alloy, revealing oxidation, hydride formation, and complex corrosion products as key factors.
Contribution
It provides new insights into the chemical and microstructural processes driving stress corrosion cracking in this titanium alloy.
Findings
Cracking initiates beneath salt particles with oxidation involvement.
Hydrides precipitate on cooling, indicating hydrogen charging.
Oxidation products include Na2TiO3, Al2O3, ZrO2, TiCl2, and TiH.
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 Na2TiO3, Al2O3, ZrO2, TiCl2 and TiH are discussed.
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