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electrical discharge machining

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001120
EISBN: 978-1-62708-214-3
...-discharge-machined surface where the resulting rehardened layer had not been removed. This rehardened layer had cracked, providing a source for fatigue initiation. Electrical discharge machining H13 UNS T20813 Fatigue fracture Metalworking-related failures Background A broken segment from...
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Published: 30 August 2021
is unaffected during electrical discharge machining. More
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Published: 30 August 2021
Fig. 8 Microstructures associated with the spalled hole ( Fig. 7 ) caused by improper electrical discharge machining technique. Etched with 3% nital More
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Published: 30 August 2021
Fig. 31 Type A2 tool steel mandrel for a tube-expanding tool (dimensions given in inches). Fracture originated at a 6.3 mm (0.25 in.) diameter hole in the square end that was drilled by electrical discharge machining. The fractograph shows a crack pattern on the fracture surface More
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Published: 30 August 2021
Fig. 7 Surface of an AISI A4 primer cup plate showing spalling at one of the 3.2 mm (⅛ in.) diameter holes made by electrical discharge machining (EDM). The surface was etched with 10% aqueous nitric acid to bring out the influence of the EDM operation at the spall. Original magnification: 2.5× More
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Published: 30 August 2021
Fig. 7 Surface characteristics of cast Inconel 718 (aged, 40 HRC) produced by electrical discharge machining (EDM). (a) Microstructure of recast layer 0.005 mm (0.0002 in.) thick generated during EDM finishing. Original magnification: 860×. (b) Microstructure of recast layer up to 0.05 mm More
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Published: 30 August 2021
. (b) Etching the surface with 10% aqueous nitric acid revealed a white-etching appearance at the teeth. Original magnification: 2×. (c) Micrograph showing a surface layer of as-quenched martensite (from the electrical discharge machining operation) and an overaustenitized matrix structure (unstable More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047935
EISBN: 978-1-62708-225-9
... was evidenced to have been melted and welded to the inner-ring raceway. It was revealed by randomly spaced welded areas on the raceways that the welding was the result of short electrical discharges between the bearing raceways and the balls. The use of an electrically nonconductive lubricant in the bearings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047840
EISBN: 978-1-62708-223-5
.... As a corrective measure, the hole through the square end of the mandrel was incorporated into the design of the tool and was drilled and reamed before heat treatment and specified hardness of the threaded portion and square end of the mandrel was reduced. Drilling Electric discharge machining Rockwell...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001296
EISBN: 978-1-62708-215-0
... microscope and/or a borescope. Aircraft components Airplanes Bearing steel Control valves Electric discharge machining Engine components Low-cycle fatigue 52000 Fatigue fracture Metalworking-related failures Brittle fracture Background A steel relay valve guide component operating...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006826
EISBN: 978-1-62708-329-4
... during grinding may not crack immediately. However, the martensitic regions often crack or spall under the stresses encountered under load in service ( Ref 12 ). Surface alterations generated during electrical discharge machining (EDM) metal alloys, such as cast Inconel 718 (aged to a hardness of 40...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001796
EISBN: 978-1-62708-241-9
... 2.9 μm Fig. 7 Craters diameters on the outer raceway: histogram ( a ), classification ( b ). The average diameter of the craters measured 2.3 μm Fig. 8 Electrical discharge model showing four phases ( a ) ignition, ( b ) formation, ( c ) discharge, and ( d ) ejection [ 6...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001458
EISBN: 978-1-62708-220-4
... by a movable bearing in a cast iron swan neck frame. The machine was one of several installed in a chemical works and was used to remove dilute nitric acid from lead nitrate. The discharge weight of crystals from the basket was approximately 6 cwts. after drying, the centrifuge being filled and discharged...
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
... machining marks. Magnetic particles have been used to emphasize the cracks. Original magnification: 0.5× Failures due to Electrical Discharge Machining Die cavities are often machined by electrical discharge machining (EDM). The technique has many advantages, but failures have been frequently...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0006548
EISBN: 978-1-62708-180-1
... modulus or modulus of elasticity; energy E elastic or storage modulus E viscous or loss modulus EAC environmentally assisted cracking EBSP electron backscattered pattern ECT equicohesive temperature EDM electric discharge machining EDS energy dispersive spectroscopy EDX energy-dispersive x-ray (analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001900
EISBN: 978-1-62708-225-9
... Abstract Incorrect grounding of an electric motor resulted in electric current passing through a 52100 steel ball bearing and caused multiple arcing between the rolling elements. The multiple arcing developed a pattern on the outer race known as ‘fluting’. A section of ball race outer showed...
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
... example, use of an electrically non-conductive grease prevented proper grounding. Example 1: Pitting Failure of Ball Bearings in an Electric Motor by Static Electrical Discharges The electric motor in an office machine was producing intermittent noise. Ball bearings were suspected as the source...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001571
EISBN: 978-1-62708-229-7
... could not begin until the vessel was defueled and the debris on the lower head was mapped, sampled and removed. In early 1988, MPR Associates Inc. (Alexandria, Virginia) was hired to remove metallurgical specimens from the lower head [ 4 ]. A remotely controlled electrical-discharge machining type...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... of their reciprocating natural gas compressors. The site operator thought there was a vibration problem on the suction bottle of the compressor. Reciprocating compressors have suction and discharge bottles to absorb the pressure pulsations from the pistons. This is similar to adding a capacitor to an electrical circuit...