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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001908
EISBN: 978-1-62708-235-8
...Abstract Abstract Cluster bomb tailcone assemblies each containing two aluminum die-cast components were rejected because of the poor surface condition of the die castings. Numerous heat checks were found on the surfaces of the tailcones and radiographic inspection revealed inclusions, gas...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0047321
EISBN: 978-1-62708-224-2
... from overload caused by thermal contraction. (a) Schematic of the clutch/brake drum assembly. Dimensions given in inches. (b) Heat checks on the surface of the drum. (c) A fracture surface of the drum showing regions affected by heat checking (A) and final-fracture region (B) During haul...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001848
EISBN: 978-1-62708-241-9
... of failure with significant contributions from the other damage mechanisms. forging die fracture thermal cycling wear tool steel heat checking deformation optical profilometry thermal conductivity H13 (chromium hot-work tool steel) UNS T20813 CuZn39Pb3 (copper-zinc wrought brass) UNS C38500...
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
..., resulting in severe work roll damage as well as machine downtime and increased maintenance costs. work rolls fracture surface-initiated spalling cast steel beach marks shear ledges (chevron rays) ratchet marks heat checks SEM fractography strain rate maximum shear stress H13 (chromium hot...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001814
EISBN: 978-1-62708-180-1
... to the tempering furnace. The heat treater will sometimes check the hardness of the part after quenching and avoid the tempering treatment if the as-quenched hardness equals the desired hardness. This is a very poor practice tor two reasons. First, tool steels must always be tempered to reduce the quenching...
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
... transmission case covers. Macrograph shows the worn-out surface of the die. Original magnification: 0.25×. Close-up views of areas 1 and 2 are shown in Fig. 49 . Fig. 49 Close-up views of areas 1 and 2 shown in Fig. 48 . (a) Area 1 reveals heat checking on the working surface. Original...
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
... served as a raceway. Spalling damage on the ground bearing raceway at five equally spaced zones was disclosed by inspection of the bevel gear. The bearing raceway was checked for runout by mounting the gear on an arbor. It was found that the raceway undulated to the extent of 0.008 mm total indicator...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001344
EISBN: 978-1-62708-215-0
... caustic-induced stress-corrosion cracking, promoted by the presence of residual welding stresses. Improved maintenance of check valves and routine inspection of critical monitoring systems (conductivity alarms, sodium analyzers, etc.) were recommended to help avoid future occurrences of severe boiler...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001106
EISBN: 978-1-62708-214-3
... the same batch of steel sheet be checked. Disintegration Electric heating elements Holding furnaces Radiant heating Sheaths UNS S31600 316 316S High-temperature corrosion and oxidation Background Visual Examination of General Physical Features Testing Procedure and Results...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0047406
EISBN: 978-1-62708-232-7
...Abstract Abstract A cast countershaft pinion on a car puller for a blast furnace broke after one month of service; expected life was 12 months. The pinion was specified to be made of 1045 steel heat treated to a hardness of 245 HRB. The pinion steel was analyzed and was a satisfactory...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0091631
EISBN: 978-1-62708-229-7
...Abstract Abstract A steam-condensate line (type 316 stainless steel tubing) began leaking after five to six years in service. The line carried steam condensate at 120 deg C (250 deg F) with a two hour heat-up/cool-down cycle. No chemical treatment had been given to either the condensate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001430
EISBN: 978-1-62708-236-5
... torsional fatigue. A second shaft carried as spare gear was fitted and failure took place in a similar manner in about the same period of time. Examination revealed that the tapered portion of the Fe-0.6C carbon steel shaft had been built up by welding prior to final machining. A detailed check...
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
... the few cracked tools to defective steel. Many times investigation has proved that defects in the steel seldom cause “percentage” cracking. The cracking usually indicates that a heat-treatment procedure is border-line and needs improvement before more serious cracking develops. Many shops check...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... A 111 Thin fins (or flash) at the parting line or at core prints Joint flash or fins A 112 Projections in the form of veins on the casting surface Veining or finning A 113 Network of projections on the surface of die castings Heat-checked die A 114 (a) Thin projection parallel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001242
EISBN: 978-1-62708-223-5
...) according to DIN 17200. Microstructural examination showed the shaft had ran hot, and there were no material defects. The shaft probably was overstressed by torsion forces. The presence of surface checks on both sides of the cam lobe that were filled with bearing metal proved that overstressing occurred...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001759
EISBN: 978-1-62708-241-9
... assembly. drive shaft bearing cup brittle fracture heat treatment carbon steel shallow case endurance and load testing fracture toughness SAE-AISI 1117 (11xx resulfurized steel) UNS G11170 Introduction Problem Statement Analysis of Problem Experimental Procedure Results...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001597
EISBN: 978-1-62708-236-5
.... 3 ). Several areas on the surface exhibited small, longitudinally oriented heat check cracks, particularly aligned with the wear near the area of spalling. Fig. 3 Severe wear and spalling near the center journal surface on Crank #1 Crank #2 exhibited similar cracking patterns, although...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006834
EISBN: 978-1-62708-329-4
... systems No heat evacuation Very good lubricant distribution Complex systems May also act as sealing against dust and pollution Heat generation may be higher under certain working circumstances Heat evacuation and cooling of the bearing zone In oil bath, always check that the lubricant reaches...
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
... or wedge-shaped cracks at grain triple points Reaction scales or internal precipitation Some cold flow in last stages of failure Contributing factors Load exceeded the strength of the part. Check for proper alloy and processing by hardness check or destructive testing, chemical analysis...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001283
EISBN: 978-1-62708-215-0
....a0003507 During the preproduction stages of forging, an initial batch of 50 mm (2 in.) diam AI-4Cu alloy extruded bar stock material was found to be cracking randomly. The quality of the raw material had been microstructurally checked and strength properties in the heat-treated condition had been...