Corrosion fatigue crack growth behavior of oil-grade nickel-base alloy 718. Part 2: Effect of aging treatment

被引：22

作者：

Chen, Ting ^{[1
,2
,3
]}

Nutter, Jared ^{[1
,2
]}

Sai, Jingsheng ^{[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] SET Labs Inc, Stafford, TX 77477 USA

[4] Inst Met Sci & Technol, Shenyang 110015, Peoples R China

来源：

CORROSION SCIENCE | 2015年 / 98卷

关键词：

Superalloys; SEM; TEM; Polarization; Pitting corrosion; Corrosion fatigue; SURFACE MODIFICATIONS; HEAT-TREATMENT; GRAIN-SIZE; MICROMECHANISMS; MICROSTRUCTURE; TEMPERATURE; PROPAGATION; CREEP;

D O I：

10.1016/j.corsci.2015.05.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of aging treatment on microstructure and corrosion fatigue crack growth (CFCG) behavior of oil-grade nickel-base alloy 718 is investigated. The average grain size of alloy 718 increases after aging treatment. Isolated platelet delta phases are precipitated at some of the grain boundaries in aged specimens. The one-step aged specimen shows a uniform distribution of fine spherical gamma' and elongated gamma '' precipitates. However, the two-step aged sample shows much finer gamma '' precipitates. Aging treatment leads to lower CFCG rates of alloy 718. Nevertheless, no visible difference of CFCG rates is observed between one-step aged and two-step aged specimens. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：280 / 290

页数：11

共 35 条

[1] Testing validity of the Tafel extrapolation method for monitoring corrosion of cold rolled steel in HCl solutions - Experimental and theoretical studies [J].