| Title |
Effects of Cr additions on Corrosion and Erosion-Corrosion Behaviors in the Weld Heat-Affected Zone of Hadfield Steel in Brine Environments |
| Authors |
진승우(Seung Woo Jin); 박진성(Jin Sung Park); 윤덕빈(Duck Bin Yun); 이상철(Sang Chul Lee); 최종교(Jong Kyo Choi); 오민석(Min-suk Oh); 김성진(Sung Jin Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2023.61.12.883 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Hadfield steel; 13% Mn; Cr; Corrosion; Erosion-corrosion |
| Abstract |
The corrosion and erosion-corrosion behaviors in the weld heat-affected zone (HAZ) of Hadfield steels with varying Cr contents (1, 2, and 3 wt%) were examined. Various experimental methods, including electrochemical polarization, impedance, and weight loss measurements, were utilized. Two types of isothermal heat treatments were conducted in a box furnace to simulate the intercritical HAZ, known to be the most vulnerable region in terms of mechanical properties and environmental stabilities, and large-scale samples for the erosion-corrosion experiment were fabricated. The results showed that increasing the Cr content improved the resistance to corrosion and erosion-corrosion, but there was an inflection point where adding more Cr had the opposite effect. Up to 2 wt%, a higher resistance was exhibited owing to the formation of a thin and protective oxide scale enriched with Cr that adhered to the steel surface. On the other hand, adding 3 wt% of Cr resulted in decreased resistance. This was due to the formation of coarse M7C3 (M: Cr) precipitated along the grain boundary, which caused the development of a thick and unstable oxide scale that detached locally. Based on these findings, it is essential to optimize the Cr content to ensure a high resistance to corrosion and erosion-corrosion in the HAZ of Hadfield steel.(Received 30 June, 2023; Accepted 22 September, 2023) |