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subsurface discontinuities

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Image
Published: 01 August 2018
Fig. 44 Method of using a yoke for detecting subsurface discontinuities in butt welds joining thin plates More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003232
EISBN: 978-1-62708-199-3
... Abstract Magnetic-particle inspection is a nondestructive testing technique used to locate surface and subsurface discontinuities in ferromagnetic materials. Beginning with an overview of the applications, advantages, and limitations of magnetic-particle inspection, this article provides...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... the effects of load frequency and temperature, material condition, and manufacturing practices on fatigue strength. It provides information on subsurface discontinuities, including gas porosity, inclusions, and internal bursts as well as on corrosion fatigue testing to measure rates of fatigue-crack...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006468
EISBN: 978-1-62708-190-0
... Abstract Magnetic-particle inspection is a method of locating surface and subsurface discontinuities in ferromagnetic materials. This article discusses the applications and advantages and limitations of magnetic-particle inspection. It describes magnetic fields in terms of magnetized ring...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001472
EISBN: 978-1-62708-173-3
... quality level to be maintained. More information on ultrasonic test methods is presented later in this article. Fig. 10 Overall view of the ultrasonic unit used to test the electron-beam welded assembly shown in Fig. 9 . Courtesy of Caterpillar, Inc. Subsurface Discontinuities Subsurface...
Image
Published: 01 January 2002
Fig. 11 Subsurface fatigue origin at gross welding discontinuity. Source: Ref 13 More
Image
Published: 15 January 2021
Fig. 11 Subsurface fatigue origin at gross welding discontinuity. Source: Ref 13 More
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006336
EISBN: 978-1-62708-179-5
... and similar defects at or just beneath the surface of castings. Magnetic-particle inspection is probably the most common technique in the foundry industry for detecting surface and subsurface discontinuities. It has numerous advantages, including being a robust and very reliable method for detecting fine...
Image
Published: 01 January 2024
Fig. 5 Second example of the effect of (a) oblique lighting versus (b) axial lighting on fracture appearance. Fracture initiation at a subsurface weld discontinuity in a high-strength welded steel chain is clearly indicated by radiating ridges when viewed with oblique directional lighting More
Image
Published: 30 August 2021
of remnant bond coating (upper right) and the subsurface oxides. (e) Optical micrograph of the coating in a relatively cool region showing the discontinuous bond coating coverage; arrows indicate locations where the outer ceramic layer (light gray) is in direct contact with the substrate. More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... alloy steel mill roll. Faint white arrow marks location of subsurface fatigue origin. Beach marks are evident within the fatigue propagation zone, which is surrounded by fast brittle fracture. Source: Ref 4 Finally, significant subsurface discontinuities or material defects can foster...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
..., the position of the crack is indicated by a detection of the high stresses in the surface right about the subsurface crack. Finally, microwave crack detection is very sensitive to crack opening and to the frequency used. Higher frequencies are needed for the smaller cracks. If the frequency is increased...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
... is surrounded by fast brittle fracture. Source: Ref 4 Finally, significant subsurface discontinuities or material defects can foster subsurface fatigue crack initiation, provided sufficient stresses are applied ( Fig. 11 ). Fig. 11 Subsurface fatigue origin at gross welding discontinuity. Source...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006450
EISBN: 978-1-62708-190-0
... discontinuities in the part The total electromagnetic field within the part The change in flow of eddy currents caused by the presence of a crack in a pipe is shown in Fig. 2 . The pipe travels along the length of the inspection coil as shown in Fig. 2 . In section A-A, no crack is present...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006472
EISBN: 978-1-62708-190-0
... but also the heat-affected zone and part of the base metal ( Ref 2 ). Fig. 1 Typical arrangement for the time-of-flight diffraction technique. Source: Ref 1 Compared to conventional techniques, TOFD has a great advantage because it can detect the diffracted signals from discontinuities...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003515
EISBN: 978-1-62708-180-1
... and changes in material properties. Used on almost any material to detect surface and subsurface discontinuities. Also used for measuring material thickness and material property changes. Cost varies from inexpensive portable equipment to high precision, automated, stationary systems. Requires properly...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003227
EISBN: 978-1-62708-199-3
.... Fatigue fractures result from progressive growth of one or more fatigue cracks generated by repetitive cyclic loading. The cracks may start at any one of several surface or subsurface discontinuities. Usually, the repetitive nature of the load cycles is reflected in a stepwise growth of the fatigue crack...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... insight into the properties, microstructure, and failure mode and can inform discontinuity location and measurements obtained nondestructively. Note that discontinuities in and of themselves may be acceptable depending on applicable design standards or codes, and are not necessarily defects which could...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... but is discouraged unless the discontinuity is such that it exceeds the limit of an applicable specification or it can be associated with a failure; for further discussion, see, for example, Ref 1 . Table 1 is a summary of various NDE methods. Several methods can detect surface or subsurface imperfections...
Book Chapter

Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006338
EISBN: 978-1-62708-179-5
... Abstract The International Committee of Foundry Technical Associations has identified seven basic categories of casting defects: metallic projections, cavities, discontinuities, defective surfaces, incomplete casting, incorrect dimension, and inclusions or structural anomalies. This article...