STRESS ORIENTED HYDROGEN INDUCED CRACKING BEHAVIOR OF HEAT AFFECTED ZONE OF L360MCS STEEL IN WET H2S ENVIRONMENT

doi:10.3724/SP.J.1037.2009.00669

Acta Metall Sin

2010, Vol. 46

Issue (5): 547-553 DOI: 10.3724/SP.J.1037.2009.00669

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STRESS ORIENTED HYDROGEN INDUCED CRACKING BEHAVIOR OF HEAT AFFECTED ZONE OF L360MCS STEEL IN WET H₂S ENVIRONMENT

ZHOU Chengshuang; ZHENG Shuqi; CHEN Changfeng

Mechanical and Electrical Engineering Faculty; China University of Petroleum; Beijing 102249

Cite this article:

ZHOU Chengshuang ZHENG Shuqi CHEN Changfeng. STRESS ORIENTED HYDROGEN INDUCED CRACKING BEHAVIOR OF HEAT AFFECTED ZONE OF L360MCS STEEL IN WET H₂S ENVIRONMENT. Acta Metall Sin, 2010, 46(5): 547-553.

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Abstract

Stress oriented hydrogen induced cracking (SOHIC) behavior of heat affected zone (HAZ) of L360MCS steel in wet H$_{2}$S
environment was studied by separating crack, SEM and EDS. The cracks are formed by four--point bending test in
wet H$_{2}$S environment. The microstructure of HAZ is obviously different from
the base metal, and the hardness of HAZ is lower than those of the base metal and welding joint. The fracture
surface of the cracks was separated and the hydrogen blisters were torn off. The cross section and fracture surface of
the cracks are analyzed by SEM and EDS. Results show that the cracks of SOHIC appeared as axial crack and vertical
crack, and the former is preferential. The appearance of cracks is associated with the low hardness value of
HAZ. The dimension of hydrogen blasters in tension stress zone of bended specimen is bigger than that in
unstressed specimen, which is due to hydrogen concentration in bended specimen is higher. Both axial and vertical
cracks nucleate independently and propagate in the quasi--cleavage manner. Tension stress not only increases the
supersaturated hydrogen concentration in tension stress zone but directly promotes vertical crack propagation.
Axial crack nucleates at MnS, CaS and precipitated phase, and propagates under internal hydrogen pressure.
Vertical crack mainly nucleates on precipitated phase and propagates under both internal hydrogen pressure and
tensile stress.

Key words: pipeline steel heat affected zone (HAZ) stress oriented hydrogen induce cracking (SOHIC) H₂S tension stress

Received: 10 October 2009

Fund:

Supported by National Natural Science Foundation of China (No.50871122), Specialized Research Fund for the Doctoral Program of Higher Education (No.20070425021})

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