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Effect of bainite in microstructure on hydrogen diffusion and trapping behavior of ferritic steel used for sour service application

Published online by Cambridge University Press:  19 December 2016

Jin Ho Park ,
Min-suk Oh  and
Sung Jin Kim
Jin Ho Park
Affiliation:
POSCO Technical Research Laboratories, Pohang 790-704, Republic of Korea
Min-suk Oh*
Affiliation:
Automotive Components & Materials R&D Group, Korea Institute of Industrial Technology, Gwangju 61012, Republic of Korea
Sung Jin Kim*
Affiliation:
Department of Advanced Materials Engineering, Sunchon National University, Suncheon 540-742, Republic of Korea
*
a) Address all correspondence to these authors. e-mail: misoh@kitech.re.kr
b) e-mail: sjkim56@sunchon.ac.kr
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Abstract

To clarify the effect of bainite in microstructure on hydrogen diffusion and trapping behavior and susceptibility to hydrogen assisted cracking of API grade linepipe steel, three specimens with different fraction of bainite in the microstructure are used. Firstly, hydrogen diffusion and trapping behaviors of the steels are studied by utilizing the electrochemical permeation technique. For fundamental analysis on the experimental data, a variety of diffusion parameters were determined by curve-fitting with a theoretical diffusion equation based on numerical finite difference method (FDM). It indicates that the steel with higher fraction of bainite exhibits much higher sub-surface hydrogen concentration and much lower apparent hydrogen diffusivity. This behavior can be understood by the fact that the steel containing higher fraction of bainite in the microstructure has higher concentration of reversible traps and consequent larger diffusible hydrogen, leading to much slower diffusion kinetics of hydrogen atoms. Consequently, the susceptibility to hydrogen induced cracking (HIC) and sulfide stress cracking (SSC) of the steel with higher fraction of bainite increases significantly.

Keywords

steelbainitethermomechanical processinghydrogen embrittlementsour environmenthydrogen induced crackingsulfide stress cracking
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1295 - 1303
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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