An Investigation on Mechanical Behaviors of pipeline Steel X70 After Electrochemical hydrogen Charging

J Chin Soc Corr Pro

2004, Vol. 24

Issue (5): 293-296 DOI:

Research Report

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An Investigation on Mechanical Behaviors of pipeline Steel X70 After Electrochemical hydrogen Charging

Ying Zhao

西安石油学院机电与材料工程学院

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Abstract Tensile tests and slow srain rate tests(SSRT) are used to investigate the mechanical behaviors of X70 pipeline steel after electrochemical hydroge charging.The experimental results show that hydrogen charging has little influence on the tensile strength of X70steel and decreases the plasticity of X70steel, thereby the fracture ductility and the fracture strength reduce considerably. After static electrochemical charging with hydrogen, the plastic properties successively decrease with the increase of pre-charging time. At the slow strain rate tension(SSRT) condition, dynamic electrochemical charging with hydrogen decreases the plasticity of X70 pipeline steel considerably. Analysis on the fracture morphology by SEM indicates that the fractograph exhibits typical ductile dimple fracture pattern after static electroxhemical charging, and the diameter of dimple becomes smaller compared to the uncharging specimen. The fractograph of dynamic electrochemical charging during the SSRT displays with a quasi-cleavage mode.

Key words: electrochemical hydrogen charging tensile plasticity tensile strength pipeline steel

Received: 05 April 2003

ZTFLH:

TG113.2

Corresponding Authors: Ying Zhao

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Ying Zhao. An Investigation on Mechanical Behaviors of pipeline Steel X70 After Electrochemical hydrogen Charging. J Chin Soc Corr Pro, 2004, 24(5): 293-296 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I5/293

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