Influence of surface modifications on pitting corrosion behavior of nickel-base alloy 718. Part 2: Effect of aging treatment

被引：47
|
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 | 2014年 / 78卷
关键词：
Superalloys; TEM; XPS; EIS; Polarization; Pitting corrosion; RESIDUAL-STRESS RELAXATION; STANDARD HEAT-TREATMENT; POINT-DEFECT MODEL; PASSIVE FILMS; ELECTROCHEMICAL IMPEDANCE; STAINLESS-STEELS; MECHANICAL-PROPERTIES; CHLORIDE SOLUTION; PRIMARY WATER; INCONEL-718;
D O I：
10.1016/j.corsci.2013.09.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A two-step aging treatment is applied to nickel-base alloy 718 that has been previously surface-treated by mill finishing (MF) and machine hammer peening (MHP). As a result, a Cr-enriched oxide layer is formed along with a nano-precipitates layer that consists of high precipitate fractions of gamma'/gamma '' on the top surface. Surface hardness increases after aging and the compressive residual stress is almost relaxed. The synergistic effects of MHP and aging on pitting corrosion behavior are studied. The results show that the corrosion resistance of the MHP specimens decreases after aging, although the corrosion resistance is still higher than the MF condition. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：151 / 161
页数：11
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