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

被引：103
作者：
Chen, Ting [1 ,2 ]
John, Hendrik [3 ]
Xu, Jing [3 ]
Lu, Qiuhong [4 ]
Hawk, Jeffrey [1 ]
Liu, Xingbo [1 ,2 ]
机构：
[1] Natl Energy Technol Lab, Albany, OR 97321 USA
[2] W Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA
[3] Baker Hughes Inc, D-29221 Celle, Germany
[4] Chinese Acad Sci, Inst Met Res, Shenyang 110015, Peoples R China
来源：
CORROSION SCIENCE | 2013年 / 77卷
关键词：
Superalloys; XPS; TEM; Polarization; EIS; Pitting corrosion; POINT-DEFECT MODEL; STAINLESS-STEEL; PASSIVE FILMS; LOCALIZED CORROSION; RESIDUAL-STRESS; ELECTROCHEMICAL-BEHAVIOR; CHLORIDE SOLUTIONS; ALUMINUM-ALLOY; HIGH-DENSITY; FATIGUE;
D O I：
10.1016/j.corsci.2013.08.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：230 / 245
页数：16
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