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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048420
EISBN: 978-1-62708-226-6
...Abstract Abstract Fretting and fretting corrosion at the contact area between the screw hole of a type 316LR stainless steel bone plate and the corresponding screw head was studied. The attack on the 316LR stainless steel was only shallow. Mechanical grinding and polishing structures were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0089567
EISBN: 978-1-62708-230-3
..., chemical analysis, mechanical testing, as-polished 54x magnification, etched with nital 33x/54x/215x/230x magnification) supported the conclusions that the NDE indications were the consequence of a cold-shut condition in the casting. The cold shut served as a stress-concentration site and was therefore...
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
... Weck’s reagent and viewed with polarized light plus sensitive tint. The arrow along the top edge points to a surface layer containing mechanical twins. Fig. 10 Light micrograph showing residual damage (arrows) from preparation that was not removed by the procedure when this specimen...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001162
EISBN: 978-1-62708-220-4
... and then dry on grade 600 paper which had been rubbed over with wax. Since in view of the thinness of the specimens (0.15 mm) only poor results as regards edge and crack edge definition could be achieved with electrolytic polishing, the tin sections were prepared by mechanical methods. They were first...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001667
EISBN: 978-1-62708-235-8
... of the titanium. The presence of this active chemical reagent increases the removal rate of pre-existing abrasion and polishing damage of the specimen and provides a superior final surface finish over mechanical polishing alone [ 2 ]. (Note: Extreme care and safety precautions must be exercised when using...
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
... for rough polishing with diamond abrasive compounds. Napless, low-, medium-, and, occasionally, high-nap cloths are used for final polishing. This step should be brief to minimize relief. Mechanical polishing can be automated to a high degree using a wide variety of devices ranging from relatively...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001108
EISBN: 978-1-62708-214-3
...) and straight parts revealed that the cracks initiated at the outer surface by a combined mechanism of creep and intergranular embrittlement. A smaller grain size resulting from cold bending fabrication procedures for the curved parts was responsible for accelerating the embrittlement. It was recommended...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001839
EISBN: 978-1-62708-241-9
... of the fracture surfaces revealed a brittle intercrystalline mode of fracture with typical manifestations of clear grain facets. Branched and discrete stepwise microcracks were also found along with unusually high levels of residual hydrogen. Mechanical tests revealed a marked loss of tensile ductility...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... (DSC) Heat of polymerization, fusion, T g , T m Thermogravimetric analysis (TGA) Composition, weight loss with time or temperature Dynamic mechanical analysis (DMA) Elastic modulus, loss modulus, tan delta Thermomechanical analysis (TMA) Penetration temperature, expansion coefficient...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... Energy-Dispersive X-Ray Analysis Electron Probe Microanalysis Auger Electron Spectroscopy Secondary Ion Mass Spectroscopy X-Ray Powder Diffraction Cutting Mounting Mechanical Preparation (Grinding and Polishing) Ceramographic Etching Hardness Determination by Microindentation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001489
EISBN: 978-1-62708-217-4
... impact loading; the comparison is being made with the polished surfaces and the tensile specimen fracture surfaces. The inclusions in the failed retaining ring were compared with the ones in a similar component obtained from a used engine. In the case of the latter, a large number of fine and elongated...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001825
EISBN: 978-1-62708-241-9
... of the tube’s outer surface adjacent to the header had a more reflective surface and appeared to have been mechanically polished. Both tube sections had loose, light tan deposits on the inner surface. There were also a few areas of loose darker brown deposits on the inner surface. A longitudinal seam weld...
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
...Abstract Abstract A 2–3 mm thick electroformed nickel mold showed early cracking under thermal load cycles. To determine the root cause, investigators obtained monotonic and cyclic properties of electroformed nickel at various temperatures and identified possible fatigue mechanisms...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001753
EISBN: 978-1-62708-241-9
... and the right-side fork leg were found still attached, the left-side axle pin joint was found on the landing strip, and the remnant body of the fractured tailwheel fork was still attached to the airplane after failure. The mechanical damage on the left-side fork leg is attributed to attritional damage...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001849
EISBN: 978-1-62708-241-9
... to the thermal and mechanical stresses applied to the roll during service and is an indication of abnormal mill operation and/or poor material quality (e.g., impurity content, improper heat treatment). The effect of roll microstructure on the spalling susceptibility and roll life has been reported in Refs. [3...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001059
EISBN: 978-1-62708-214-3
... capable of magnifications up to 120×. Replication requires a detailed surface grinding, polishing, and etching sequence before actual surface metallographic conditions can be replicated. First, the surface is ground down to bare metal with a 60-grit flap wheel; then successively smaller grits (down...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001343
EISBN: 978-1-62708-215-0
... at the inner surface of the material. Polished and etched Mechanical Properties Hardness The hardness values measured on both the outer and inner surfaces were similar to that of the solution-annealed material. Discussion Optical microscopic examination of the leaking portion...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006761
EISBN: 978-1-62708-295-2
...Abstract Abstract Mechanical testing is an evaluative tool used by the failure analyst to collect data regarding the macro- and micromechanical properties of the materials being examined. This article provides information on a few important considerations regarding mechanical testing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001666
EISBN: 978-1-62708-229-7
... the keyway surfaces. Microstructural details were revealed by the use of field metallographic preparation techniques and replicated by acetate foil for examination with optical and scanning electron microscopes. It was possible by these techniques to establish the cracking mechanism as stress corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
.... , Annual Review of Materials Science , Vol. 9 , p. 304 ( 1974 ). 7. Dieter G. E. , Mechanical Metallurgy , McGraw-Hill , p. 15 ( 1976 ). 8. Metals Handbook , 8th ed. , Vol. 3 , American Society for Metals , p. 130 ( 1967 ). Selected References Selected References...