Impact of Reversed Austenite on the Pitting Corrosion Behavior of Super 13Cr Martensitic Stainless Steel

被引:112
作者
Lei, Xiaowei [1 ,2 ]
Feng, Yaorong [3 ]
Zhang, Jianxun [1 ]
Fu, Anqing [3 ]
Yin, Chengxian [3 ]
Macdonald, Digby D. [2 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
[2] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
[3] CNPC, Tubular Goods Res Inst, Xian 710077, Peoples R China
关键词
Martensitic stainless steel; Reversed austenite; Heat treatment; Pitting corrosion; TEM; TEMPERING TEMPERATURE; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; PASSIVE FILMS; MICROSTRUCTURE; SENSITIZATION; MOLYBDENUM; RESISTANCE; INITIATION; STABILITY;
D O I
10.1016/j.electacta.2016.01.094
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Many attempts in the past have been made to introduce the reversed austenite phase into Super 13Cr martensitic stainless steel, in order to enhance its mechanical performance, but the impact of reversed austenite on the corrosion properties has not been clearly defined. To investigate the influence of reversed austenite on the pitting behavior of Super 13Cr, specimens were tempered at different temperatures to acquire microstructures without/with the reversed austenite phase. The microstructures and morphologies were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). Potentiodynamic polarization, potentiostatic polarization, and potentiostatic pulse experiments were performed in 3.5% NaCl solution, in order to characterize and analyze the pitting performance. The experimental results show that reversed austenite is distributed along the martensite laths boundaries, as formed in the 620 degrees C-tempered specimen. The Ni-enriched region adjacent to the carbides enables the nucleation of reversed austenite. In the presence of reversed austenite, the 620 degrees C-tempered specimen exhibits a higher pitting potential, lower corrosion current density, and superior metastable pitting resistance than the does 560 degrees C-tempered specimen (without reversed austenite), which indicates that the presence of reversed austenite enhances the pitting resistance of Super 13Cr. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:640 / 650
页数:11
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