Role of Hydrogen in Sulfide Stress Cracking of Steels

J Chin Soc Corr Pro

1981, Vol. 1

Issue (4): 38-48 DOI:

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Role of Hydrogen in Sulfide Stress Cracking of Steels

Wen Lichang (Shanghai Institute of Metallurgy; Chinese Academy of Sciences)

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Abstract The polarization and stress corrosion cracking behavior of 12 MnMoVNbTi steels in H_2S saturated solution was studied and comparison with hydrogen stress cracking behavior was made. The results show that the variation of Mo, Nb contents and difference in microstructure of steels have no important effect on corrosion rate but influence their stress corrosion cracking behavior considerably. The similarity between stress cracking behavior of these steels in H_2S solution and in hydrogen charging condition implies that the nature of sulfide stress cracking of steels is hydrogen embrittlement. The experimental results of stress relaxation and constant load tests in hydrogen charging condition prove that hydrogen has dual action of softening and hardening steel.It is found that the entrance of hydrogen induces plastic deformation of 12MnMoVNbTi steels below their yield stress level. The plastic deformation rate slows down with time and will not lead to fracture. From the relationship between hydrogen stress cracking and plastic deformation behavior, it is suggested that the dislocation movement in this deformation process would help the trasport of hydrogen to plastic zone and crack tip and promote hydrogen embrittlement.

Received: 25 August 1981

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Wen Lichang (Shanghai Institute of Metallurgy; Chinese Academy of Sciences). Role of Hydrogen in Sulfide Stress Cracking of Steels. J Chin Soc Corr Pro, 1981, 1(4): 38-48.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1981/V1/I4/38

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