Fractography in the Failure Analysis of Corroded Fracture Surfaces

2008 ◽  
pp. 366-366-14 ◽  
Author(s):  
AO Ibidunni
Keyword(s):  
Failure Analysis ◽  
Fracture Surfaces

SCC In-Field Inspection Technology Evaluation and its Application to EMAT Based Pipeline Integrity Management Programs

2014 ◽  
Author(s):  
Samarth Tandon ◽  
Ming Gao ◽  
Ravi Krishnamurthy ◽  
Richard Kania ◽  
Mark Piazza
Keyword(s):  
Failure Analysis ◽  
Extensive Study ◽  
Complete Data ◽  
Technology Evaluation ◽  
Data Set ◽  
Field Inspection ◽  
Fracture Surfaces ◽  
Comprehensive View ◽  
Integrity Management

Most recently, as a complement to the ongoing efforts to monitor and document improvements in EMAT ILI technology, PRCI conducted an extensive study of NDE inspection technologies for characterizing SCC in pipelines using various in-ditch technologies and methods. The test pipes used for the study were cut outs from an operating pipeline where SCC features were identified and sized using EMAT ILI technologies. These are now sized with the NDE study and correlated with EMAT data to support an improvement of EMAT technology in characterizing SCC features. More importantly, the test pipes were burst tested to failure, with post failure analysis completed to fully characterize the crack features, including detailed length and depth measurements. This complete data set provides a comprehensive view of the current capabilities of NDE inspection technologies and EMAT ILI technologies to detect and characterize SCC and crack-like features. In this paper, the approach used for the evaluation of in-ditch NDE and EMAT ILI technologies is presented first. The in-ditch NDE technologies used for evaluation which were commonly used for SCC characterization are then described. SCC characterization results from in-ditch NDE and EMAT ILI are summarized and compared to those directly measured from fracture surfaces exposed by burst tests. The findings and its application to pipeline integrity management programs are discussed.

scholarly journals Failure analysis of stainless steel lanyard wire rope

2019 ◽  
Vol 16 (1) ◽  
Author(s):  
A. Sambasiva Rao ◽  
A. K. Singh
Keyword(s):  
Stainless Steel ◽  
Fracture Surface ◽  
Failure Analysis ◽  
Grain Boundaries ◽  
Wire Rope ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Wire Ropes ◽  
Fracture Surfaces

Present work describes the failure analysis of AISI 304 stainless steel consisting of 7x19 construction lanyard wire rope which has failed during service. The microstructures and properties of failed wire rope have been investigated and compared with unused wire rope. Both the periphery and fracture surface of the wire rope display the presence of corrosion debris enriched with O and Cl. The fracture surfaces of the failed and unused wire ropes display intergranular and dimples, respectively. The lanyard wire rope has been exposed in corrosive atmosphere and failed in intergranular mode due to enrichment of O and Cl along the grain boundaries.

Effects of Si and Ni nanoparticles in Brazing process on fracture surfaces of 304 stainless steels

2012 ◽  
Vol 1381 ◽  
Author(s):  
H. M. Hdz-García ◽  
J. L. Acevedo-Dávila ◽  
L. A. García-Cerda ◽  
M. I. Pech-Canul ◽  
R. Muñoz-Arroyo ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Failure Analysis ◽  
Stainless Steels ◽  
Filler Metal ◽  
Transient Liquid Phase ◽  
Capillary Forces ◽  
Nucleation And Growth ◽  
Ni Nanoparticles ◽  
Fracture Surfaces

AbstractIn order to increase the wettability and capillary forces of the filler metal between micro-cracking and micro-porous on the fracture surfaces of 304 stainless steels, methods of impregnation of Si and growth of Ni nanoparticles were used. These nanoparticles have a role inside the Transient Liquid Phase (TLP) and the substrate when using Brazing process. TLP can react with the nanoparticles previously deposited between micro-cracking and micro-porous and therefore promotes the nucleation and growth sites of phases and decreases the formation of eutectic structures. This method increases the effectiveness of metallic components reparation using Brazing process. Such effectiveness is indicated by an inspection of microstructural failure analysis, as a first stage, in the covered zone by the filler metal.

A novel method for failure analysis based on three-dimensional analysis of fracture surfaces

2014 ◽  
Vol 44 ◽  
pp. 74-84 ◽  
Author(s):  
Yuguang Cao ◽  
Wenjun Nie ◽  
Jiancheng Yu ◽  
Kiyoshi Tanaka
Keyword(s):  
Failure Analysis ◽  
Dimensional Analysis ◽  
Three Dimensional ◽  
Fracture Surfaces ◽  
Novel Method

The Failure Analysis Process

2012 ◽  
pp. 549-583
Keyword(s):  
Chemical Analysis ◽  
Failure Analysis ◽  
Mechanical Testing ◽  
Metallographic Analysis ◽  
Fracture Surfaces ◽  
Service Testing ◽  
Analysis Process

Abstract This chapters discusses the basic steps in the failure analysis process. It covers examination procedures, selection and preservation of fracture surfaces, macro and microfractography, metallographic analysis, mechanical testing, chemical analysis, and simulated service testing.

Failure analysis of cracked welds in an off-shore construction. Detection of paint in fracture surfaces

1986 ◽  
Vol 19 (4) ◽  
pp. 406
Author(s):  
K.R. Müller ◽  
P.O. Johnsen ◽  
J. Hjelen
Keyword(s):  
Failure Analysis ◽  
Fracture Surfaces

Microanalytical examination of the oxides on fracture surfaces as a new method for failure analysis

1986 ◽  
Vol 96 (2-3) ◽  
pp. 245-254
Author(s):  
A. Seibold ◽  
S. Porner ◽  
H. Steinmill ◽  
H. Fischer
Keyword(s):  
Failure Analysis ◽  
New Method ◽  
Fracture Surfaces

scholarly journals Failure analysis of stainless steel lanyard wire rope

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
A. Sambasiva Rao ◽  
A. K. Singh
Keyword(s):  
Stainless Steel ◽  
Fracture Surface ◽  
Failure Analysis ◽  
Grain Boundaries ◽  
Wire Rope ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Wire Ropes ◽  
Fracture Surfaces

Present work describes the failure analysis of AISI 304 stainless steel consisting of 7x19 construction lanyard wire rope which has failed during service. The microstructures and properties of failed wire rope have been investigated and compared with unused wire rope. Both the periphery and fracture surface of the wire rope display the presence of corrosion debris enriched with O and Cl. The fracture surfaces of the failed and unused wire ropes display intergranular and dimples, respectively. The lanyard wire rope has been exposed in corrosive atmosphere and failed in intergranular mode due to enrichment of O and Cl along the grain boundaries.

New Dimensions in Freeze-Etching

1969 ◽  
Vol 27 ◽  
pp. 202-203 ◽  
Author(s):  
Russell L. Steere ◽  
Michael Moseley
Keyword(s):  
Fracture Surfaces ◽  
Aluminum Specimen ◽  
Specimen Holder ◽  
Freeze Etching ◽  
The Right

A redesigned specimen holder and cap have made possible the freeze-etching of both fracture surfaces of a frozen fractured specimen. In principal, the procedure involves freezing a specimen between two specimen holders (as shown in A, Fig. 1, and the left side of Fig. 2). The aluminum specimen holders and brass cap are constructed so that the upper specimen holder can be forced loose, turned over, and pressed down firmly against the specimen stage to a position represented by B, Fig. 1, and the right side of Fig. 2.

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