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roughening

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Image
Published: 15 January 2021
Fig. 6 Closeup of scuffing wear failure. (a) Roughening of the surface. Reprinted from Ref 37 with permission from Elsevier. (b) Material transfer. Source: Ref 38 More
Image
Published: 01 June 2019
Fig. 1 Roughened surface with reddish-brown patches (arrows) seen on crankshaft flange afterface of No. 1 main engine of the vessel More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001415
EISBN: 978-1-62708-236-5
... not been grooved but appeared to have been roughened by shot or grit-blasting prior to spraying and the deposit was more firmly adherent to these surfaces than in the case of the pins. It is doubtful, however, whether the adhesion of sprayed metal to a surface prepared even in this manner would always...
Image
Published: 01 December 1993
Fig. 2 SEM micrographs of an AM-355 poppet valve sealing surface showing extensive surface roughening and surface cracking. (a) 72.8 ×. (b) 560× More
Image
Published: 01 December 1993
Fig. 6 Section A in Fig. 5 . Microstructure of a crack-free region on the tube OD at the coil ID. Tube axis is horizontal in the figure. Microstructure consists of pearlite and ferrite. Compare coarse microstructure at surface to Fig. 9 . Surface roughening where oxide not present. 2% Nital More
Image
Published: 30 August 2021
Fig. 8 Surface characteristics of Waspaloy (aged, 40 HRC) produced during electrochemical machining. (a) Best-practice (gentle) conditions generate a slight roughening of the surface and some intergranular attack. (b) Abusive conditions generate severe intergranular attack. (c) Microhardness More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001621
EISBN: 978-1-62708-227-3
... roughened in some areas, as shown in Fig. 1 . Original machining marks were not as visible on the afterface as they were on other surfaces of the flange. The flange, which had six bolt holes in it, was examined on all surfaces by fluorescent magnetic-particle examination. Linear indications, which proved...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001183
EISBN: 978-1-62708-223-5
... the structure of a heat treated alloy steel ( Figs. 2 ). A strongly fissured and therefore brittle alloy zone was in contact with the steel. The existence of a superlattice phase Fe 3 Al was probable. At the outer edge metal was adhering at some places that was roughened during polishing and therefore was soft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001536
EISBN: 978-1-62708-229-7
... grooved and roughened. In some cases, fine, regularly spaced radial cracks are present on the failed surface. Figure 6 shows the sort of damage observed on the sealing face of a failed ring. The circular grooves and surface roughening observed on this face have a maximum depth of ∼130 µm (0.005...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001569
EISBN: 978-1-62708-229-7
... in operation and maintenance/repair may increase a part's exposure and likelihood of failure during the part's life. Corrosion may assist the fatigue process to various degrees. Generally, it lowers the threshold stress for fatigue. It may act to roughen the surface of a part producing localized stress...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001628
EISBN: 978-1-62708-234-1
... not fully separate from the ammonia and flowed onto the surface of the cylinder. The boiling action of the ammonia against the surface of the cylinder caused slight erosion and roughening in the presence of the hard oxide particles, and this may also have led to light corrosion of the cylinder itself...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001604
EISBN: 978-1-62708-234-1
..., link up and cause general roughening and material loss. As round microcraters are formed, the surface material is moved to the edges of the craters and these extrusions eventually break off, causing loss of metal from the surface. The sharp pressure pulses caused by the collapsing bubbles are highly...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
... in CA-6NM ( Fig. 2b ), and at grain and twin boundaries in type 304 stainless steel ( Fig. 3b ). Fracture surfaces thus exposed may be striated, as in Fig. 4 . Material loss then spreads over the entire region subject to cavitation collapse, resulting in extremely roughened surfaces with completely...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006794
EISBN: 978-1-62708-295-2
... strength and lower resistance to wear. Thus, wear can be considerably accelerated. Corrosion-induced surface imperfections and roughening can be precursors to microcracking. The degradation of materials under corrosion attack is often accompanied with surface imperfections such as pits and grooves...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001294
EISBN: 978-1-62708-215-0
... grains. Superficial boundary separation is apparent as surface cracks propagate along grain boundaries. Fig. 2 SEM micrographs of an AM-355 poppet valve sealing surface showing extensive surface roughening and surface cracking. (a) 72.8 ×. (b) 560× Metallography Microstructural Analysis...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006796
EISBN: 978-1-62708-295-2
... by multiple droplet impacts, LDI erosion initiates on the wall material. The initial stages of erosion consist of incubation, acceleration, maximum rate, and deceleration ( Ref 1 ). In the incubation stage, little or no material loss occurs by LDI, while roughening and metallurgical changes take place...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001084
EISBN: 978-1-62708-214-3
... of the shroud near the group 1 defects. The micrograph clearly shows excessive subsurface porosity throughout the tempered martensite microstructure. Note that surface B ( Fig. 5(a) , bottom) has been roughened by cavitation erosion. The section through group 2 illustrates both surface porosity ( Fig. 5b...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001547
EISBN: 978-1-62708-225-9
... springs are susceptible to premature failure, the metallurgical condition of the material was examined. The only abnormalities found were a roughened surface of the wire and a concentration of microstructural damage at the base of the end hooks. Surface roughness varied along the circumference...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001802
EISBN: 978-1-62708-241-9
... and compressive sides of these bends were then evaluated using SEM. An SEM image that shows portions of the tensile and compressive sides of a bend still under compression are shown in Fig. 7 . The compressive side of the sample shows increased surface roughening and cracking, while the tensile side...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003521
EISBN: 978-1-62708-180-1
... Rays or chevrons point to origin Flat progressive zone with beach marks Overload zone consistent with applied loading direction Ratchet marks where origins join General wastage, roughening, pitting, or trenching Stress-corrosion and hydrogen damage may create multiple cracks...