EFFCTS OF HYDROGEN ON FRACTURE OF PRE-CRACKING SPECIMENS OF X70 PIPELINE STEEL

J Chin Soc Corr Pro

2008, Vol. 28

Issue (2): 81-85 DOI:

Research Report

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EFFCTS OF HYDROGEN ON FRACTURE OF PRE-CRACKING SPECIMENS OF X70 PIPELINE STEEL

WANG Rong

西安石油大学材料科学与工程学院

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Abstract The pre-cracking specimens of X70 pipeline steel were pre-charged with hydrogen in 0.5mol/L H2SO4 solution,and then extended in air to fracture in order to obtain the fracture roughness of the cracking bodies. When the hydrogen concentration was less than 0.978×10-4 mass%,the hydrogen made the fracture roughness in?鄄crease 11.8%. When the hydrogen concentration was more than 0.978×10-4 mass%, the hydrogen made the frac?鄄ture roughness decrease according to the linear relationship of the hydrogen concentration.The fracture surfaces were characteristic of the dimple and the diameter of the dimple varied smaller with the gradual increase of the hydrogen concentration. On the slow strain rate tension tests with dynamically charging with hydrogen in 0.5mol/L H2SO4 solution,the fracture roughness decreased considerably.The fracture roughness for hydrogen-induced cracking decreased linearly with exponential function of charging current density. The hydrogen-induced fracture had appearance of the quasi-cleavage.

Key words: hydrogen cracking bodies fracture roughness pipeline steel

Received: 25 September 2006

Corresponding Authors: WANG Rong E-mail: wangrong@xsyu.edu.cn,rongw123@163.com

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Cite this article:

WANG Rong. EFFCTS OF HYDROGEN ON FRACTURE OF PRE-CRACKING SPECIMENS OF X70 PIPELINE STEEL. J Chin Soc Corr Pro, 2008, 28(2): 81-85 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2008/V28/I2/81

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