Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 35, Issue 8, Pages 1787-1796Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.03.021
Keywords
Intergranular corrosion; Ferritic stainless steel; Double loop electrochemical potentiokinetic reactivation (DL-EPR); TEM; Cr-depleted zone
Funding
- National Key Research and Development Program of China [2018YFB0704400]
- National Natural Science Foundation of China [51501041, 51871061, 51671059]
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Intergranular corrosion (IGC) behavior of the stabilized ultra-pure 430LX ferritic stainless steel (FSS) was investigated by using double loop electrochemical potentiokinetic reactivation (DL-EPR) and oxalic acid etch tests to measure the susceptibility of specimens given a two-step heat treatment. The results reveal that IGC occurs in the specimens aged at the temperature range of 600-750 degrees C for a short time. The aging time that is required to cause IGC decreases with the increase of aging temperature. A longer aging treatment can reduce the susceptibility to IGC. The microstructural observation shows that M23C6 precipitates form along the grain boundaries, leading to the formation of Cr-depleted zones. The presence of Cr-depleted zones results in the susceptibility to IGC. However, the atoms of stabilizing elements replace chromium atoms to form MC precipitates after long-time aging treatment, resulting in the chromium replenishment of Cr-depleted zones and the reduction of the susceptibility to IGC. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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