Effect of Mn addition on the precipitation and corrosion behaviour of 22% Cr economical duplex stainless steel after isothermal aging at 800 °C

被引:11
作者
Feng, Zaiqiang [1 ]
Yang, Yinhui [2 ]
Wang, Jia [3 ]
机构
[1] North China Univ Water Resources & Elect Power, Sch Mech Engn, Zhengzhou 450045, Peoples R China
[2] Kunming Univ Sci & Technol, Sch Mat Sci & Engn, Kunming 650093, Peoples R China
[3] Tongji Univ, Sch Mat Sci & Engn, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
Metals and alloys; Intermetallics; Microstructure; Precipitation; Corrosion; SIGMA-PHASE PRECIPITATION; MECHANICAL-PROPERTIES; MICROSTRUCTURAL STABILITY; PITTING CORROSION; RESISTANCE; 800-DEGREES-C; CHLORIDE; CAST; ENVIRONMENTS; PARAMETERS;
D O I
10.1016/j.jallcom.2017.01.031
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The microstructural and corrosion behaviour of Fe-22Cr-1.9Ni-2.3Mo-0.2N-xMn low nickel type duplex stainless steel (DSS) with Mn contents ranging from 4.3 to 9.7 wt% were studied after aging treatment at 800 degrees C lasting from 30 to 930 min. The corrosion behaviour was investigated in 3.5 wt% NaCI solution by measurements of potentiodynamic polarisation and electrochemical impedance spectroscopy. The microstructural analysis shows that the sigma precipitates mainly nucleated along gamma/delta phase boundaries and grew into the adjacent delta-ferrite by prolonging the aging time, having the same eutectoid structures as commercial high-Ni DSS. At high Mn contents, the growth rate of a precipitates was initially high with aging times from 30 to 150 min, but decreased gradually up to 930 min with more Mn participation. A Mn content of 4.3 wt% brought only about a 150 mV pitting potential (E-b) drop for the aged specimens, while further addition of Mn significantly lowered E-b at the early stage of aging with more aging-induced a precipitates. The metastable pit nucleation resistance decreased with Mn content from 4.3 to 6.9 wt% and was suppressed by a higher Mn addition of 9.7 wt% for aging treatments from 150 to 930 min. The pits mainly initiated along gamma/delta boundaries and within delta ferrite, then propagated around a precipitates with increasing aging time, and more Mn gives rise to both the number and size of pits in the early stage of aging treatment. The charge transfer resistance (Rt) depends strongly on the existence of defects caused by the a precipitates, while increasing Mn content slightly decreases the passive film resistance (Rfilm) in specimens aged from 60 to 930 min. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:334 / 344
页数:11
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