Corrosion behavior of ultrasonic impact treated Haynes 25 superalloy

Document Type : Research Paper

Authors

1 Department of Materials Science and Engineering, Imam Khomeini International University, Qazvin, Iran

2 Department of Manufacturing and Production, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

10.22059/jufgnsm.2025.01.07

Abstract

The effect of ultrasonic impact treatment (UIT) was studied on the microstructure and corrosion behavior of Haynes 25 superalloy. The UIT was performed at a frequency of 20 kHz, tool feeding rates of 0.08, 0.12, and 0.16 mm/rev, vibration amplitudes of 10, 28, and 50% of the machine power, static pressures of 0.1 and 0.9 bar at the different number of passes (one, two, three, five, and seven). According to the results, the UIT severely deformed the surface layers up to a depth of about 100 μm and promoted the emergence of deformation bands/strain-induced martensite (-phase) up to a depth of about 400 μm. The UIT also produced ultrafine grain structure in the surface region and due to the deformation inhomogeneity developed surface compressive residual stresses. The Tafel polarization tests indicated that applying one pass UIT at the static pressures of 0.1 and 0.9 bar reduced the corrosion current (from 4.16 A/cm2 to 1.3 A/cm2 and 2.18 A/cm2, respectively), and the corrosion potential (from -0.6 V to -0.7 V and -0.8 V, respectively). This behavior was found to be due to promotion of surface oxidation and formation of protective layer on the surface. Despite increasing the surface smoothness, further increasing the UIT pass number to seven, probably due to encouraging the formation of surface pits/microcracks increased the corrosion current and corrosion rate by about 45%. According to the electrochemical impedance tests, at the static pressure of 0.9 bar, the as-received and seven-pass UITed samples showed the lowest corrosion resistance whilst one-pass and two-pass UITed samples revealed the highest corrosion resistance. The effect of tool feeding rate on the corrosion resistance was found to be minor.

Keywords

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Journal of Ultrafine Grained and Nanostructured Materials
Volume 58, Issue 1
June 2025
Pages 67-77

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History

  • Receive Date: 27 March 2025
  • Revise Date: 15 April 2025
  • Accept Date: 16 April 2025

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