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논문 기본 정보

자료유형
학술저널
저자정보
Meysam Ranjbar (Tarbiat Modares University) Reza Miresmaeili (Tarbiat Modares University) Mohammad Reza Naimi‑Jamal (Iran University of Science and Technology) Majid Mirzaei (Tarbiat Modares University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10
발행연도
2021.10
수록면
3,918 - 3,934 (17page)
DOI
10.1007/s12540-020-00882-8

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This study investigated the influence of microstructure on the mechanical properties and fracture toughness of API X65pipeline steel in the presence of hydrogen. In this study, electrochemical method was used for hydrogen charging and indentationtechnique was applied to obtain the fracture toughness. The results showed that in the presence of hydrogen, elongation(EL%), reduction of area (RA), ductile fracture percentage, and fracture toughness of all microstructures decreased. Themicrostructure of martensite (M) + bainite (B) + ferrite (F), had the highest hydrogen trapping and uptake (Capp) as 8.58 × 10?6 mol cm?3 and the lowest apparent hydrogen diffusivity (Dapp) as 5.68 × 10?10 m2 s?1; thus, the maximum decrements of33% in fracture toughness, 40% in ductile fracture percentage, 47% in RA, and 35% in EL% were observed. However, themicrostructure of ferrite (F) + degenerated perlite (DP) + martensite-austenite micro constituent (M/A), where the lowestvalue of 5.85 × 10?6 mol cm?3 for Cappand the highest value of 8.5 × 10?10 m2 s?1 for Dapphad the minimum decrements as2% in fracture toughness, 10% in ductile fracture percentage, 4% in RA, and 7% in El%. According to the obtained results,depending on the type of microstructures, hydrogen-induced work softening or hardening were observed by decreasing orincreasing the yield stress respectively.

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