EFFECT OF APPLIED POTENTIAL ON SCC OF X80 PIPELINE STEEL AND ITS WELD JOINT IN KU&rsquo;ERLE SOIL SIMULATED SOLUTION

CHEN Xu; WU Meng; XIAO Jun; HE Chuan

doi:10.3724/SP.J.1037.2010.00102

Acta Metall Sin >

2010 , Vol. 46 >Issue 8: 951 - 958

DOI: https://doi.org/10.3724/SP.J.1037.2010.00102

论文

EFFECT OF APPLIED POTENTIAL ON SCC OF X80 PIPELINE STEEL AND ITS WELD JOINT IN KU’ERLE SOIL SIMULATED SOLUTION

CHEN Xu ,
WU Meng ,
XIAO Jun ,
HE Chuan

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College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001

Received date: 2010-03-01

Revised date: 2010-05-30

Online published: 2010-08-10

Supported by

Supported by National Natural Science Foundation of China (No.50771053)

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Abstract

Potentiodynamic polarization technique and slow strain rate testing (SSRT) were employed to study the stress corrosion cracking (SCC) behavior of a welded X80 pipeline steel in Ku’erle soil simulated solution. Fracture surfaces were observed by SEM under different applied potential conditions. The results show that the polarization curves of the base metal and weld joint represent the typical characteristics of active dissolution. It is found that cracks are generally initiated at corrosion pits and inclusions under anode polarization and open circuit potential. The crack generation mechanism of X80 pipeline base steel and weld metal are attributed to the dissolution at anode. When the applied potential is −900 mV (vs SCE), the base metal exhibites lower SCC sensitivity due to cathodic protection while under the same condition welded joins higher SCC sensitivity. Both the base metal and weld joins exhibite higher SCC sensitivity under −1200 mV (vs SCE) polarization potential and their cracking generation mechanism is hydrogen induced cracking (HIC) due to the synergistic action of stress and hydrognCommonly the weld joint is more sensitive to SCC than the base etal under the same applid potential, and fractures are usually presented in heat affected zone (HAZ) and this is attributed to metallurgical phase transformation and residual stress enerated during welding process.

Key words： X80 pipeline steel; weld joint; soil simulated solution; applied potential; stress corrosion cracking

Cite this article

CHEN Xu , WU Meng , XIAO Jun , HE Chuan . EFFECT OF APPLIED POTENTIAL ON SCC OF X80 PIPELINE STEEL AND ITS WELD JOINT IN KU’ERLE SOIL SIMULATED SOLUTION[J]. Acta Metall Sin, 2010 , 46(8) : 951 -958 . DOI: 10.3724/SP.J.1037.2010.00102

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