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Title: Fracture toughness of line pipe steels under cathodic protection using crack tip opening displacement tests

Abstract

A series of crack tip opening displacement (CTOD) tests were carried out for evaluation of hydrogen stress cracking (HSC) of pipelines under cathodic protection. In the buffer solution, the critical CTOD ([delta][sub c]) of API 5L X65 line pipe steels was dependent on the CTOD testing mode (constant load rate testing and constant displacement rate testing) and also on the testing rate. [delta][sub c] decreased drastically when 1 mA/cm[sup 2] < cathodic current density (i) [le] 2 mA/cm[sup 2] and depended less on i when i [ge] 2 mA/cm[sup 2]. [delta][sub c] decreased with decreasing cathodic off-potential (E[sub off]) when E[sub off] [le] [minus]1.2 V vs a copper-copper sulfate (Cu-CuSO[sub 4]) electrode. Good correlation could be observed between fracture morphology and [delta][sub c]. The pH of the buffer solution had no significant effect on [delta][sub c]. The maximum tolerable defect size for the pipeline was evaluated with [delta][sub c].

Authors:
;  [1]
  1. Tokyo Gas Co., Ltd. (Japan). Fundamental Technology Research Lab.
Publication Date:
OSTI Identifier:
6448422
Resource Type:
Journal Article
Journal Name:
Corrosion
Additional Journal Information:
Journal Volume: 55:5; Other Information: Paper presented at Corrosion/97, March 1997, New Orleans, LA (US); Journal ID: ISSN 0010-9312
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; CATHODIC PROTECTION; CORRELATIONS; CRACKS; FRACTURE MECHANICS; FRACTURE PROPERTIES; HYDROGEN; PIPELINES; STEELS; ALLOYS; CORROSION PROTECTION; ELEMENTS; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; MECHANICS; NONMETALS; 360103* - Metals & Alloys- Mechanical Properties; 360105 - Metals & Alloys- Corrosion & Erosion; 420205 - Engineering- Transport & Storage Facilities- (1980-)

Citation Formats

Hagiwara, N, and Oguchi, N. Fracture toughness of line pipe steels under cathodic protection using crack tip opening displacement tests. United States: N. p., 1999. Web. doi:10.5006/1.3284013.
Hagiwara, N, & Oguchi, N. Fracture toughness of line pipe steels under cathodic protection using crack tip opening displacement tests. United States. https://doi.org/10.5006/1.3284013
Hagiwara, N, and Oguchi, N. Sat . "Fracture toughness of line pipe steels under cathodic protection using crack tip opening displacement tests". United States. https://doi.org/10.5006/1.3284013.
@article{osti_6448422,
title = {Fracture toughness of line pipe steels under cathodic protection using crack tip opening displacement tests},
author = {Hagiwara, N and Oguchi, N},
abstractNote = {A series of crack tip opening displacement (CTOD) tests were carried out for evaluation of hydrogen stress cracking (HSC) of pipelines under cathodic protection. In the buffer solution, the critical CTOD ([delta][sub c]) of API 5L X65 line pipe steels was dependent on the CTOD testing mode (constant load rate testing and constant displacement rate testing) and also on the testing rate. [delta][sub c] decreased drastically when 1 mA/cm[sup 2] < cathodic current density (i) [le] 2 mA/cm[sup 2] and depended less on i when i [ge] 2 mA/cm[sup 2]. [delta][sub c] decreased with decreasing cathodic off-potential (E[sub off]) when E[sub off] [le] [minus]1.2 V vs a copper-copper sulfate (Cu-CuSO[sub 4]) electrode. Good correlation could be observed between fracture morphology and [delta][sub c]. The pH of the buffer solution had no significant effect on [delta][sub c]. The maximum tolerable defect size for the pipeline was evaluated with [delta][sub c].},
doi = {10.5006/1.3284013},
url = {https://www.osti.gov/biblio/6448422}, journal = {Corrosion},
issn = {0010-9312},
number = ,
volume = 55:5,
place = {United States},
year = {1999},
month = {5}
}