Corrosion Resistance of Welded Joints in the Ultrafine-Grained Pseudo-[alpha]-Titanium Ti-5Al-2V Alloy

Abstrac t-The diffusion welding of ultrafine-grained pseudo-[alpha]-titanium Ti-4.73% Al-1.88% V alloy specimens has been performed by spark plasma sintering. It has been shown that the destruction of welded joints in the ultrafine-grained (UFG) specimens under hot salt corrosion (HSC) conditions ha...

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Bibliographic Details
Published inPhysics of metals and metallography Vol. 122; no. 8; p. 761
Main Authors Chuvil'deev, V. N, Nokhrin, A. V, Andreev, P. V, Sandler, N. G, Bakmetyev, A. M, Vostokov, M. M, Likhnitskii, K. V
Format Journal Article
LanguageEnglish
Published Springer 01.08.2021
Subjects
Alloys
Corrosion and anti-corrosives
Grain boundaries
Nuclear energy
Specialty metals industry
Titanium
Welding
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Summary:Abstrac t-The diffusion welding of ultrafine-grained pseudo-[alpha]-titanium Ti-4.73% Al-1.88% V alloy specimens has been performed by spark plasma sintering. It has been shown that the destruction of welded joints in the ultrafine-grained (UFG) specimens under hot salt corrosion (HSC) conditions has a two-stage character: intercrystallite corrosion (ICC) is developed at the first stage to turn into pitting corrosion at the following stage. It has been established that the resistance to intercrystallite corrosion is governed by the concentration of vanadium on grain boundaries, the size and volumetric content of [beta]-phase particles, and the existence of pores in a welded joint. It has been demonstrated that the welded joints of the ultrafine-grained specimens have higher hardness and resistance to intercrystallite corrosion as compared to coarse-grained specimens.
ISSN:0031-918X
DOI:10.1134/S0031918X21080056