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vibratory polishing

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001852
EISBN: 978-1-62708-241-9
... of weight percentage. Following finally polishing using colloidal silica in a vibratory polisher, the faint microstructure suggests that the material has a columnar grain structure. Fig. 1 EDX analysis of the elements of the electroformed nickel (results of spectrums analyses are tabulated in Table...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001366
EISBN: 978-1-62708-215-0
... point the fissure breaks through the surface into the matrix, and a crack is developed. The term “persistent slip band” refers to the fact that when the surface offsets are removed by polishing and the specimen cycled again, new cracks occur at the same sites, because the material within...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001359
EISBN: 978-1-62708-215-0
... of an aeroengine exhibited low fatigue life during vibratory fatigue testing of new blades. Fatigue life is evaluated as the product of the amplitude and frequency (AF value). During routine fatigue testing, a few blades were found to have unusually low AF values. The reason for the low fatigue life...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001747
EISBN: 978-1-62708-217-4
... tip failures, all surface-damaged material should be removed and polished smooth before further flight. The blade should be correctly dressed. Also, the tachometer should be calibrated to ensure the engine/propeller combination is not operated in the critical speed range at normal cruising speeds...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003532
EISBN: 978-1-62708-180-1
... around it). Specimen etched with nital Fig. 38 (a) Pitting on this mold cavity (arrow) was observed after polishing of the AISI S7 plastic mold and was caused by the use of improper post-EDM procedures. (b) The classic appearance of such failures. There is a large, remelted surface layer above...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006765
EISBN: 978-1-62708-295-2
... RGD and 15 or 30 μm diamond, depending on the metal or alloy. For some very difficult metals and alloys, a 1 μm diamond step on a synthetic woven cloth (similar to step 3 but for 3 min) could be added, and/or a brief vibratory polish (use the same cloths and abrasives as for step 4) may be needed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001082
EISBN: 978-1-62708-214-3
... configuration. A number of solutions involving material selection and impeller redesign were recommended. Castings Chlorides, environment Propellers Repair welding Vibratory stresses 304L UNS S30403 Stress-corrosion cracking Fatigue fracture Background Visual Examination of General Physical...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... against a polished flat Fig. 19 Plot of depth of wear scar versus compressive and tensile residual stresses in the fretted surface. Source: Ref 41 Fig. 25 Effect of atmospheric pressure on the friction and wear of a carbon steel cylinder Fig. 26 Potential drop obtained when...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001816
EISBN: 978-1-62708-180-1
... specifications. Polished and nital-etched specimens of the metal in both the ruptured and the unruptured tubes were examined metallographically at a magnification of 500 × . Near the rupture edge in the failed tube, the microstructure consisted of ferrite and acicular martensite or bainite ( Fig. 11a...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... in the presence of dirt and moisture. General rusting and deep pits can be seen in this drawn cup, as well as polished indentations resulting from abrasive action under vibratory conditions. The roller spacing is indicated by the spacing of the polished indentations. Fig. 4 Bearings that were damaged...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... in a laboratory, the requirements for on-site testing may involve the use of portable laboratories with metallographic equipment for grinding, mechanical polishing, and etching. Small specimens can be cut from a part on the site for preparation, examination, and photography immediately or upon return to a fully...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... fatigue crack origins. 13× Clearly, the physical root cause is the design of the mixer blade, which defined two bend areas that contained tensile residual stresses, tensile assembly stresses, and a notch-sensitive microstructure that added to the normal operating rotational and vibratory stresses...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... sometimes subjected to vibratory stresses. Apart from wear by bearings, which can be a major contributor to shaft failure (see the section “Wear” in this article), the most common cause of shaft failure is metal fatigue. Fatigue is a weakest link phenomenon; hence, failures start at the most...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... rotational and vibratory stresses. The net effect was a reduction in the life of the blade, causing loss of function. Corrective-action recommendations included the addition of a stand-off washer between the wavy washer and the bottom shoulders of the blade, or modification of the shape of the wavy washer...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2