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The hydrogen induced cracking(HIC) behavior of a high deformability pipeline steel was investigated with three different dual-phase microstructures,ferrite and bainite(F+B),ferrite and martensite/austenite islands(F+M/A) and ferrite and martensite(F+M),respectively.The HIC test was conducted in hydrogen sulfide(H2S)-saturated solution.The results showed that the steels with F+B and F+M/A dual-phase microstructures had both higher deformability and better HIC resistance,whereas the harder martensite phase in F+M microstructure was responsible for the worst HIC resistance.The band-like hard phase in dual-phase microstructure was believed to lead to increasing susceptibility to HIC.
The hydrogen induced cracking (HIC) behavior of a high deformability pipeline steel was investigated with three different dual-phase microstructures, ferrite and bainite (F + B), ferrite and martensite / austenite islands (F + M / A) and ferrite and martensite (F + M), respectively. The HIC test was conducted in hydrogen sulfide (H2S) -saturated solution. The results showed that the steels with F + B and F + M / A dual-phase microstructures had both higher deformability and better HIC resistance, while the harder martensite phase in F + M microstructure was responsible for the worst HIC resistance. The band-like hard phase in dual-phase microstructure was believed to lead to increasing susceptibility to HIC.