Investigation of the sensitization and intergranular corrosion of tube-to-tubesheet welds of hyper duplex stainless steel using an electrochemical reactivation method

被引：72

作者：

Kim, Hye-Jin ^{[1
]}

Jeon, Soon-Hyeok ^{[1
]}

Kim, Soon-Tae ^{[1
]}

Lee, In-Sung ^{[1
]}

Park, Yong-Soo ^{[1
]}

Kim, Kwang-Tae ^{[2
]}

Kim, Young-Sub ^{[3
]}

机构：

[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea

[2] POSCO Tech Res Labs, Stainless Steel Res Grp, Pohang 790785, Gyeongbuk, South Korea

[3] Res Inst Ind Sci & Technol, Mat Res Div, Pohang 790600, South Korea

来源：

CORROSION SCIENCE | 2014年 / 87卷

关键词：

Stainless steel; Polarization; TEM; Intergranular corrosion; Welding; Thermodynamic diagrams; HEAT-AFFECTED ZONE; PITTING CORROSION; DETECTING SENSITIZATION; MECHANICAL-PROPERTIES; SECONDARY AUSTENITE; THERMAL CYCLES; SHIELDING GAS; MICROSTRUCTURE; NITROGEN; RESISTANCE;

D O I：

10.1016/j.corsci.2014.06.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The sensitization and intergranular corrosion associated with a phase transformation of tube-to-tubesheet welds of hyper duplex stainless steel were investigated using modified double loop electrochemical potentiokinetic reactivation. The susceptibility to sensitization of the hyper duplex stainless steel tube-to-tubesheet welded with an Ar shielding gas supplemented with nitrogen gas decreased owing to a decrease of the ferrite phase fraction and precipitation of chromium nitrides, thereby increasing the intergranular corrosion resistance. The intergranular corrosion in the hyper duplex stainless steel welds was selectively initiated at the Cr-depleted regions adjacent to the chromium nitride precipitates in the ferrite phases. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：60 / 70

页数：11

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