1-20 of 194 Search Results for

Grinding cracks

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Image
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
Image
Published: 01 January 2002
Fig. 89 Micrograph of grinding cracks in case-hardened 8620 steel showing small cracks (see small arrows) that passed through the hardened case to the core, and the burned layer on the surface (dark band with arrow at the left) that resulted in grinding burns. (Note: Nital and acidic ferric More
Image
Published: 01 January 2002
Fig. 90 Grinding cracks on the flanks of a small spur gear wheel. Source: Ref 30 More
Image
Published: 01 January 2002
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
Image
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
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001552
EISBN: 978-1-62708-217-4
... generation which induced grinding cracks and grinding burn. Tensional stresses resulting from grinding developed in a thin surface layer. On another crankshaft, chromium plating introduced undesirable residual tensile stresses. Such plating is an unsatisfactory finish for crankshafts of aircraft engines...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047964
EISBN: 978-1-62708-223-5
... and a spalled area was observed at each high point. The presence of numerous cracks that resembled grinding cracks was revealed both by magnetic-particle inspection and microscopic examination. Spalling was produced by nonuniform loading in conjunction with grinding cracks. As corrective measures, the spindle...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001539
EISBN: 978-1-62708-236-5
... Abstract Overhaul mechanics discovered a crack in an AISI 4340 Cr-Mo-Ni alloy steel pivot bolt when grinding off the chromium plating. The bolt had served for an estimated 10,000 h and was replated when last overhauled. On checking the bolt, several fine cracks were found on the surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001538
EISBN: 978-1-62708-217-4
... revealed this area also displayed an intergranular texture. One of a group of small grinding cracks on the ID of the cylinder nucleated the failure. Other evidence indicated the cracks developed when the cylinder was ground during overhaul. Aircraft components Cylinders Grinding cracks Landing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0009222
EISBN: 978-1-62708-180-1
.... Classification of the factors does not necessarily pinpoint the cause of each failure. For example, poor grinding practices may have left cracks, or improper heat treatment may have made it impossible to grind by any method without producing cracks. Another example is a tool with a sharp corner that cracks...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001191
EISBN: 978-1-62708-225-9
... such as this, fracture faces due to stress-cracking and overload fracture look the same. Metallographic examination showed the failure of the rings was a result of repeated heating and rapid cooling of the surface due to the grinding of the bearings on one flank of the middle flange. The stress-cracks (grindcracks...
Image
Published: 01 June 2019
Fig. 2 Replica of crack edge in steam drum after four grinding steps. Unetched. More
Image
Published: 01 June 2019
Fig. 3 Replica of crack edge after eight grinding steps. Unetched. More
Image
Published: 30 August 2021
Fig. 23 Failed stub secondary cracking. Grinding marks bisect the corrosion product More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001761
EISBN: 978-1-62708-241-9
... of the crankshaft. The partial absence of the nitrided layer in the fillet region, due to over-grinding, caused a decrease in the fatigue strength which, in turn, led to crack initiation and propagation, and eventually premature fracture. Signs of crankshaft misalignment during installation were also suspected...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
... revealed that the cracking was caused by the combination of incorrect grinding procedure, the presence of hydrogen, and fatigue. The grinding damage generated tensile stresses in the steel, which caused intergranular cracking during the plating cycle. The intergranular cracks were initiation sites...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047813
EISBN: 978-1-62708-229-7
... Abstract After being in service for ten years the ball-and-race coal pulverizer was investigated after noises were noted in it. Its lower grinding ring was attached to the 6150 normalized steel outer main shaft while the upper grinding ring was suspended by springs from a spider attached...
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 Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006818
EISBN: 978-1-62708-329-4
... to abusive grinding practices are caused by failure to temper the part or are due to overaustenitization. Both of these problems will make a tool steel virtually impossible to grind without producing surface burning and cracking regardless of the care taken during grinding. Thus, the aforementioned factors...
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
... removed by grinding. Visual Examination of General Physical Features The origin of fatigue cracking in the blades exhibiting low AF values was associated with spherical beads ( Fig. 1 ), although these surfaces were polished, examined, and found clear of any surface flaws during metrology prior...