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논문 : 기계적 성질 ; 보론 첨가 고강도강의 수소지연파괴 저항성에 미치는 입계 페라이트의 영향 = Research Papers : Mechanical Behavior ; Effect of Intergranular Ferrite on the Hydrogen Delayed Fracture Resistance of High Strength Boron-added Steel

  • 초록
    • In this study, the effect of intergranular ferrite volume fraction on the hydrogen delayed fracture (HDF) resistance of high strength boron-added steel was investigated. For this purpose, constant loading test using cathodically charged specimens was conducted on the three intergranular ferrite volume fractions, i.e., 000, 6% and l0%. With the increase of the amount of intergranular ferrite volume fractions, the HDF resistance in boron-added steel was increased. TEM and SEM observations revealed that the intergranular ferrite took the carbides nucleation sites at grain boundaries, and as a result, the crack nucleation sites were reduced. And the result of thermal desorption analysis showed that the grain boundaries were the main trapping sites.