Influence of surface modifications on pitting corrosion behavior of nickel-base alloy 718. Part 1: Effect of machine hammer peening

Journal Article · Sun Dec 01 00:00:00 EST 2013 · CORROSION SCIENCE

DOI:https://doi.org/10.1016/j.corsci.2013.08.007· OSTI ID:1129857

The effect of surface modifications induced by machine hammer peening on pitting corrosion behavior of nickel-base alloy 718 in a 3.5 wt.% NaCl solution is investigated. Severe work hardening and high compressive residual stress are generated with surface smoothing and microstructure evolution in terms of formation of nano-grains and nano-twins in the near surface region after machine hammer peening. Electrochemical tests results show that machine hammer peening has a beneficial influence on the corrosion resistance, indicated by a significant increase of the critical pitting potential (+134 mV) accompanied with lower corrosion current density and higher polarization resistance.

• Research Organization: National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
• Sponsoring Organization: USDOE Office of Fossil Energy (FE)
• DOE Contract Number: DE-FE0004000
• OSTI ID: 1129857
• Report Number(s): A-UNIV-PUB-057
• Journal Information: CORROSION SCIENCE, Vol. 77
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Superalloys
XPS
TEM
Polarization
EIS
Pitting corrosion