Effect of abrasive water jet peening on NaCl-induced hot corrosion behavior of Ti–6Al–4V. (April 2023)

• Record Type: Journal Article
• Authors: Chakkravarthy, V.; Oliveira, J.P.; Mahomed, Anisa; Yu, Nan; Manojkumar, P.; Lakshmanan, M.; Zhang, Long; Raja, V.; Jerome, S.; Prabhu, T. Ram; Narayan, R.L.
• Is Part Of: Vacuum. Volume 210(2023)
• Publication Date: 2023-04
• Subjects: Hot corrosion -- Abrasive cavitation peening -- Ti–6Al–4V alloy -- NaCl molten Salt -- Compressive residual stress; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2023.111872
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Hot corrosion studies were performed on pristine and abrasive water jet peened (AWJP) Ti–6Al–4V surfaces. Oxide scales form on the peened and pristine surfaces when coated with NaCl and exposed to 600 °C for 100 h. Despite similar oxide compositions on both surfaces, the thickness and roughness of the oxide scale on the AWJ peened surface is lower. The hot corrosion rate of the pristine surface is 2.5 times higher than that on the AWJ peened surface. Enhanced hot corrosion resistance of the latter is attributed to compressive residual stresses on the surface that retards diffusion of chloride in the material. Highlights: Hot corrosion behavior of abrasive water jet peened Ti–6Al–4V was investigated. Surface microstructures are refined and compressive residual stresses were induced. Peening had generated high density dislocations in Ti–6Al–4V components. Hot corrosion resistance of peened sample was threefold times higher than pristine one.