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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046028
EISBN: 978-1-62708-235-8
... of 0.025 mm (0.001 in.) in this layer was 52 HRC (a minimum of 55 HRC was specified). Thus, the failure was caused by brittle fracture in the hardness-transition zone as the result of excessive impact loading. The burned layer indicated that the cracks had been caused by improper grinding after hardening...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048124
EISBN: 978-1-62708-235-8
... Abstract Presence of transverse marks which were remnant of grinding was indicated in a failed valve spring made from ground rod. The shot-peening pattern was light at this location. A transverse crack was found to grow from one such mark under the influence of local stress fields until...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0091853
EISBN: 978-1-62708-223-5
... Abstract A 230 mm (9 in.) diameter disk attrition mill was scheduled to grind 6.35 mm (0.25 in.) diameter quartz particles to a 0.075 mm (0.003 in.) diameter powder. Due to severe wear on the grinding plates, however, the unit was unable to complete the task of grinding the rock. The mill...
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Published: 01 June 2019
Fig. 3 Grinding burn area (hard, brittle white layer of untempered martensite; Rc 54 to 56) and microcracks (arrows) on fillet surface near fatigue origin. Magnification 75 times; 2 pct nital etch. More
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Published: 01 June 2019
Fig. 7 Grinding burn zone consists of untempered martensite. Magnification 100 times; 2 pct nital. More
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Published: 01 June 2019
Fig. 2 Replica of crack edge in steam drum after four grinding steps. Unetched. More
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Published: 01 June 2019
Fig. 3 Replica of crack edge after eight grinding steps. Unetched. More
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Published: 01 June 2019
Fig. 2 Weld-repaired area showing extensive grinding following. More
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Published: 01 June 2019
Fig. 2 Grinding checks on cam lobe side, after application of magnaflux method. 1 × More
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Published: 01 June 2019
Fig. 6 Grinding check on cam lobe side. Etch: Nital. 100 × More
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Published: 01 June 2019
Fig. 7 Cold deformation and grinding martensite at surface of cam lobe side. Etch: Nital. 200 × More
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Published: 01 June 2019
Fig. 4 Accelerometer at left center is attached to a grinding machine. Tiny, complex vibrations caused variations in the quality of internally ground bores. More
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Published: 01 June 2019
Fig. 2 The grinding/polishing head of the Di-Profiler which is driven by the motor through a flexible shaft. More
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Published: 01 January 2002
Fig. 17 Light micrograph showing a SiC grinding-abrasive particle (arrow) lodged in a weldment in 6061-T6 aluminum etched with aqueous 0.5% hydrofluoric acid More
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Published: 01 January 2002
Fig. 37 (a) Abusive grinding caused this 50 mm (2 in.) diameter AISI O1 tool steel die to crack (left, after dye-penetrant inspection). (b) Typical appearance of the cracks (etchant has bled out of the crack, producing a stain around it). Specimen etched with nital More
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Published: 01 January 2002
Fig. 7 A slitter knife of D2 tool steel exhibits characteristic grinding cracks (both parallel and network types) when etched in cold dilute nitric acid. More
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Published: 30 August 2021
Fig. 10 Grinding cracks caused by failure to temper a part. (a) Two dies made from AISI D2 tool steel that cracked after finish grinding (cracks accentuated with magnetic particles). (b) Macroetching (10% aqueous nitric acid) of the end faces revealed grinding scorch. These dies were More
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Published: 30 August 2021
Fig. 23 Failed stub secondary cracking. Grinding marks bisect the corrosion product More
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Published: 30 August 2021
Fig. 24 Mate axle with pitting corrosion product bisected by grinding marks More
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Published: 30 August 2021
Fig. 25 Mate journal pitting with grinding marks present in the bare metal of the pit More