| Title |
Effect of Intergranular Ferrite on the Hydrogen Delayed Fracture Resistance of High Strength Boron-added Steel |
| Authors |
김지수(Ji Soo Kim); 이유환(You Hwan Lee); 이덕락(Duk Lak Lee); 이종수(Chong Soo Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
high strength boron-added steel; hydrogen delayed fracture resistance; intergranular ferrite; constant Loading test; thermal desorption analysis |
| Abstract |
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. |