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alpha alloys

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001684
EISBN: 978-1-62708-225-9
.... The examination centered on corrosion of the brass components. The seat and shaft were alpha brass, with a hardness of 64 and 79 DPH, respectively. A nut held the shaft onto the seat, and was alpha-beta brass with a hardness of 197 DPH. Welded on the end of the shaft was a ring of hard (DPH 294) alpha-beta brass...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047645
EISBN: 978-1-62708-229-7
... Abstract An outer fan-duct assembly of titanium alloy Ti-5Al-2.5Sn (AMS 4910) for a gas-turbine fan section cracked 75 mm (3 in.) circumferentially through a repair weld in an arc weld in the front flange-duct segment. Examination of the crack with a binocular microscope revealed no evidence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0090030
EISBN: 978-1-62708-217-4
... the bore emanating from a hard alpha (HA) defect. Such defects can result from occasional upsets during the vacuum melting of titanium. These nitrogen-rich alpha titanium anomalies are brittle and often have associated microcracks and microvoids. A probabilistic damage tolerance approach was recommended...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001667
EISBN: 978-1-62708-235-8
... alloy (Ti-6Al-4V) cylinders. In this case, a blue-colored oxidized surface region was observed adjacent to the circumferential butt weld joining the two cylinders. This led to the concern that oxygen was introduced into the part during the welding procedure and caused alpha case formation of the surface...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001843
EISBN: 978-1-62708-241-9
... as the failure mechanism in the investigation. electrical connectors tin pest plating defect copper alpha tin x-ray diffraction temperature copper (copper contact alloy, general) tin-bismuth (tin-bismuth plating alloy, general) References 1. Eckert...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001103
EISBN: 978-1-62708-214-3
... agent capable of producing stress cracking (in environments where mercury is known to be absent) is ammonia and that, in alpha-beta alloys of the type discussed here, the crack path is usually intergranular with respect to the alpha grains and occasionally transcrystalline in the beta phase ( Ref 2...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001660
EISBN: 978-1-62708-236-5
... pins ( Figure 3 ). The shear bands form during the rolling of the pin threads. Titanium alloys are known to have a high propensity for shear band formation owing to their high strength and low thermal conductivity [ 3 ]. It has been reported that shear band formation in Ti-6Al-4V alpha-beta alloys...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001782
EISBN: 978-1-62708-241-9
... operations are not carefully controlled. In addition, when welding alpha–beta titanium alloys, shielding atmospheres are required to inhibit weld contamination and the development of brittle structures. Titanium alloy driver heads are hollow shells constructed from three or four separate forged pieces...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001409
EISBN: 978-1-62708-229-7
... of the alpha variety, e.g. the 70:30 type, are more susceptible than those having a lower zinc content, e.g. the 80:20 alloys. In the case of alloys of the 60:40 type, which show an alpha plus beta structure, the grains of the beta constituent (which have the higher zinc content) may suffer prior...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001609
EISBN: 978-1-62708-229-7
... and prevents sensitization at and below the mill annealing temperature range. 1 Precipitation of the Fe-Cr nonmagnetic sigma phase in alloy 430 takes tens to thousands of hours at 650 to 760 °C (1200 to 1400 °F) and does not noticeably develop during PWHT. Precipitation of the alpha-prime phase at 425...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001410
EISBN: 978-1-62708-220-4
...”; an environment of the acid type tends to favour this form of attack. Alternatively, only local areas may be affected, this being known as “plug-type dezincification”. High-zinc brasses of the alpha variety, e.g. the 70:30 type, are more susceptible than those having a lower zinc content, e.g. the 80:20 alloys...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001411
EISBN: 978-1-62708-234-1
... than those having a lower zinc content, e.g. the 80:20 alloys. In the case of alloys of the 60:40 type, which show an alpha plus beta structure, the grains of the beta constituent (which have the higher zinc content) may suffer prior dezincification. This case relates to the failure of a welded joint...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001809
EISBN: 978-1-62708-241-9
... bronze . Paper No.03262, NACE Corrosion/2003, NACE International , Houston, Texas 10.3168/jds.2019-16489 2. Ferrara R.J. , Caton T.E. , Review of dealloying of cast aluminum bronze and nickel–aluminum bronze alloys in sea water service . Mater. Perform. 21 ( 2 ), 30 – 34 ( 1982...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001772
EISBN: 978-1-62708-241-9
.... After a thorough examination, it was concluded that the part had failed due to dealloying via desiliconification. pump impeller corrosion erosion cast silicon bronze porosity microstructural analysis chemical composition Silicon bronze alloy UNS C86700 References 1...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001083
EISBN: 978-1-62708-214-3
... Abstract Copper alloy (C83600) impellers from two different feed pumps that supplied water to a 2-year-old boiler failed repeatedly. Examination by various methods indicated that the failures were caused by sulfide attack that concentrated in shrinkage voids in the castings. Two alternatives...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001313
EISBN: 978-1-62708-215-0
... analysis of crystalline compounds in the deposit indicated the possible presence of ammonia. Failure was attributed to stress-corrosion cracking resulting from ammonia in the cooling water. It was recommended that an alternate tube material, such as a 70Cu-30Ni alloy or a titanium alloy, be used...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001801
EISBN: 978-1-62708-241-9
... fixation device fracture surface damage titanium alloy notches roughness metallography fatigue crack growth rates ASTM F136 (alpha-beta titanium alloy) UNS R56401 References 1. http://www.scoliosis.org/resources/medicalupdates/instrumentationsystems.php . Accessed 20 June...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001374
EISBN: 978-1-62708-215-0
... Abstract Two hot water reheat coil valves from a heating/ventilating/air-conditioning system failed in service. The values, a 353 copper alloy 19 mm (3/4 in.) valve and a 360 copper alloy 13 mm (1/2 in.) valve, had been failing at an increasing rate. The failures were confined to the stems...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
.... (c) Worn tooth with cold work. Ferric chloride etch. (d) Alloy steel gear with worn teeth. Original magnification: 5×. (e) Section through worn tooth with burrs. Structure change from heat of wear is visible. Nital etch. (f) Deformed material on top tooth. Nital etch Discontinuities can...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001057
EISBN: 978-1-62708-214-3
... Abstract A brass (CDA alloy 230) pipe nipple that was part of a domestic cold water bath system failed two weeks after installation. Macrofractography, SEM examination, metallography, and chemical analyses were performed on specimens cut through the main fracture surface. The physical...