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논문 기본 정보

자료유형
학술저널
저자정보
Jong Won Han (Dong-A University) Sang Hoon Jung (Chosun Welding Co. Ltd) Hae Woo Lee (Dong-A University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.3
발행연도
2022.3
수록면
733 - 744 (12page)
DOI
10.1007/s12540-021-01073-9

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In this study, Inconel 625 weldments with different Nb contents were prepared via shielded metal arc welding followed byaging heat treatment. The microstructures of the resulting weldments were observed using scanning electron microscopy/energy-dispersive X-ray spectroscopy. The fabrication process used in this study resulted in the partial formation of the γ"(750 °C), δ (850 °C), and M6C carbide (950 °C) phases in the weldments. The electron backscattering diffraction resultsrevealed that with an increase in the Nb content, the secondary phase fraction of the weldments increased. Potentiodynamicpolarization tests were carried out to evaluate the pitting corrosion resistance of the weldments. With increasing Nb contentof the weldments, the fraction of the passive region increased at 750 and 850 °C. The corrosion and formal potentials ofthe weldment with 4.26 wt% Nb decreased after the heat treatment at 950 °C, resulting in a relatively small passive region. Double loop-potentiokinetic reactivation tests were carried out to evaluate the sensitization of the weldments to interphasecorrosion. The degree of sensitization increased with increasing Nb content when the heat treatment was carried out at 750and 850 °C. The δ-phase showed lesser effect on the interphase corrosion resistance of the weldments than the γ" phase. Thespecimen with 4.26 wt% Nb heat-treated at 950 °C showed high degree of sensitization to interphase corrosion.

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