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sinter hardening

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047793
EISBN: 978-1-62708-217-4
... Abstract Failure of a case hardened steel shaft incorporated fuel pump in a turbine-powered aircraft resulted in damage to the aircraft. The disassembled pump was found to be dry and free of any contamination. Damage was exhibited on the pressure side of each spline tooth in the impeller...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001361
EISBN: 978-1-62708-215-0
... the race was also of 17-4PH hardened to 26 to 35 HRc. The ball was constructed of 440C steel hardened to 55 to 62 HRc. The liner was a Teflon impregnated sintered bronze matrix. Visual Examination of General Physical Features Rod and Body The fracture surface was found to contain beach marks...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006793
EISBN: 978-1-62708-295-2
... stress cycling. The hardness of the material forming the surfaces of the impacting bodies has been noted to increase ( Ref 2 , 8 , 12 ). Within the deformation zone, this is credited to work hardening, whereas in the white layer, it is a property of the near-surface material developed in situ ( Ref...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006838
EISBN: 978-1-62708-329-4
... considerations, and quality assurance. The emphasis is on the design and metallurgical aspects for the two main types of metal AM processes: powder-bed fusion (PBF) and directed-energy deposition (DED). The article also describes the processes involved in binder jet sintering, provides information on the design...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... stress cycling. Hardness has been noted to increase at the surface of impacting bodies ( Ref 2 , 5 , 9 ). Within the deformation zone this is credited to work hardening, while in the white layer, it is a property of the near surface material developed in situ ( Ref 9 ). A different subsurface...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001109
EISBN: 978-1-62708-214-3
... ore involves grinding, magnetic separation of iron, mixing in additives, pelletizing, and heating the pellets to high temperatures to sinter and harden them (induration). In “acid” pellet production, the additive is bentonite, which serves as a binder to promote green strength. In “fluxed” pellet...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... members of the flap assembly were a normal overload type, with no evidence of preexisting flaws. Fig. 1 Flap supports in relation to overall flap structure. Pertinent Specifications The flap supports were specified to be made from 17-4PH precipitation-hardened martensitic stainless steel...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
... view of failure area showing worn splines This particular model of fuel pump had a history of wear failures and had been redesigned to incorporate a shaft of case-hardened steel (composition not reported). Vibration was common during operation but generally was not excessive for the aircraft...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... ductility can still experience crack initiation and growth since some slight plasticity may by present. Relatively brittle metals such as hardened steel and gray cast iron do not always form microscopically identifiable striations and macroscopic beach marks in cyclic failures. Transgranular Cleavage...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... polymers but not on a macroscopic scale in a metallic material. With regard to fatigue, materials with poor ductility can still experience crack initiation and growth, because some slight plasticity may by present. Relatively brittle metals such as hardened steel and gray cast iron do not always form...
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
... for sectioning sintered carbides, ceramic materials, thermally sprayed coatings, printed circuit boards, electronic components, bone, teeth, and so on. Mounting The primary purpose of mounting metallographic specimens is for convenience in handling specimens of difficult shapes or sizes during...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... shows that a rougher surface suffers less damage ( Ref 38 ). Shot peening is a widely applied surface treatment that produces roughening, work hardening, and a residual compressive stress in the surface. The author showed that shot peening a steel surface reduced the coefficient of friction...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... and in the impeller were worn away by vibration in the presence of sand and metallic particles. Detail A: Enlarged view of failure area showing worn splines This particular model of fuel pump had a history of wear failures and had been redesigned to incorporate a shaft of case-hardened steel (composition...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
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
.... While pieces with a small section size that would normally be sectioned with an abrasive cutter can be cut with a precision saw, the cutting time is appreciably greater, but the depth of damage is much less. Precision saws are widely used for sectioning sintered carbides, ceramic materials, thermally...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... to quantify the wear evolution of a sintered steel displaying a significant fluctuation of the friction coefficient, depending on the loading condition. Adapted from Ref 42 One limitation of the Archard approach is that it does not consider the coefficient of friction in its formulation. Hence, under...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003560
EISBN: 978-1-62708-180-1
... by a cutting tool. In gouging abrasion, the wearing surface is plastically deformed and work hardened by the abrasive forces, so that cutting and tearing of metal occurs on the work-hardened surface. Typical operations that involve gouging abrasion include crushing and primary grinding operations. The wear...
Book Chapter

Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
.... In gouging abrasion, the wearing surface is plastically deformed and work hardened by the abrasive forces, so that cutting and tearing of metal occurs on the work-hardened surface. Typical operations that involve gouging abrasion include crushing and primary grinding operations. The wear liners of crushing...
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
... the risk of fractured components in service ( Fig. 6 ) ( Ref 9 ). For example, the surface layers on a hardened (quenched and tempered to 45 HRC) AISI 4340 were not altered with a best-practice “low-stress” grinding practice, as illustrated in Fig. 6(a) . Faster grinding speeds, >30 m/s (6000 ft/min...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001809
EISBN: 978-1-62708-180-1
... be kept out with felt wipers and covers, but it is sometimes better to make the bearings of hardened, sintered iron rather than bronze. One insidious effect of foreign particles is that they may scratch or score the shaft surface rather severely, which adds more foreign particles to the system ( Fig. 10...