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논문 기본 정보

자료유형
학술저널
저자정보
ChangHeon Yang (Dong-A University) Donghyun Kim (Dong-A University) Haewoo Lee (Dong-A University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.11
발행연도
2021.11
수록면
4,681 - 4,699 (19page)
DOI
10.1007/s12540-021-01028-0

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초록· 키워드

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In this study, the effect of Nb content and aging temperature on the weld of Inconel 690 was investigated by the behaviorof M23C6 . After changing the Nb content of FM-52 to 0.65 wt%, 1.48 wt%, 2.45 wt%, and 3.46 wt%, shielded metalarc welding was conducted under constrained conditions to reduce the thermal deformation. As a result of measuringthe hardness after aging treatment, the hardness increased with the Nb content, and it was determined that the transgranularand intergranular precipitation effect of MC on the increase in hardness was greater than that of M23C6 , whichmainly precipitated at the migrated grain boundary (MGB) compared to MC. Optical Microscope analysis showed thatthe MGB changed from a straight type to a vermicular type as the Nb content increased. As a result of SEM/EDS andEBSD analysis, most of the carbide ( M23C6 ) was observed in specimen A with a low Nb content and decreased with anincrease in the aging temperature, and the fraction of M23C6 decreased with an increase in the Nb content. Micro-voidswere generated by a large amount of M23C6 at an aging temperature of 600?800 °C in the A and B specimens with arelatively low Nb content. The pitting resistance was improved due to the amount of Cr-rich M23C6 decreased as the Nbcontent increased. However, no decrease in corrosion resistance was observed owing to the micro-voids produced nearCr-rich M23C6.

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