Electrochemical Characteristics of Delta Ferrite in Thermally Aged Austenitic Stainless Steel Weld

被引：0

作者：

Subramanian, Gokul Obulan ^{[1
]}

Hong, Sunghoon ^{[1
]}

Lee, Ho Jung ^{[1
]}

Kong, Byeong Seo ^{[1
]}

Lee, Kyoung-Soo ^{[2
]}

Byun, Thak Sang ^{[3
]}

Jang, Changheui ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Nucl & Quantum Engn, Daejeon, South Korea

[2] KHNP, Cent Res Inst, Daejeon, South Korea

[3] Pacific Northwest Natl Lab, Richland, WA USA

来源：

PROCEEDINGS OF THE 18TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL DEGRADATION OF MATERIALS IN NUCLEAR POWER SYSTEMS - WATER REACTORS, VOL 2 | 2018年

关键词：

DL-EPR analysis; Stainless steel weld; Thermal aging; Corrosion; Delta ferrite; STRESS-CORROSION CRACKING; BEHAVIOR; PHASES;

D O I：

10.1007/978-3-319-68454-3_50

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An austenitic stainless steel Type 316L weld was thermally aged for 20,000 h at 400 degrees C and electrochemical characterization was performed to measure corrosion resistance in delta-ferrite phase. It is well known that a severe thermal aging causes decrease of fracture resistance and increase of the hardness of delta-ferrite, which was related to the spinodal decomposition. After thermal aging, the DL-EPR response of 316L weld was dominated by parent austenite matrix without reactivation peak. To characterize the delta-ferrite only, austenite phase was selectively dissolved from the matrix by electrochemical etching method. The double-loop electrochemical potentiokinetic reactivation (DL-EPR) analysis of the delta-ferrite phase showed degradation in corrosion resistance after thermal aging with the appearance of a cathodic loop and reactivation peak during the reverse scan. The degradation in corrosion resistance of delta-ferrite phase could be attributed to the localized Cr-depletion due to spinodal decomposition and precipitation of inter-metallic phases during thermal aging.

引用

页码：653 / 661

页数：9

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