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age-hardening treatment

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001451
EISBN: 978-1-62708-224-2
... and aged condition, rupture occurs in a wholly brittle manner, but ductile behaviour can be restored either by a sub-critical annealing treatment which results in recrystallisation of the work-hardened layer and the re-solution of the precipitates responsible for the ageing, or by removing the surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001590
EISBN: 978-1-62708-228-0
.... Available Materials and Post Fabrication Heat Treatments Alloys containing the age hardening elements (Al, Ti, Nb plus C) are susceptible to stress relation cracking when placed in service with the age hardening temperature range. The propensity to develop stress relaxation cracking increases...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001727
EISBN: 978-1-62708-225-9
... vehicle failed at Cape Kennedy ( Fig. 2 ). They were made of 17-4 PH in the H900 condition — a martensitic, age-hardening alloy. In the H900 condition (solution treated and aged 1 hr at 900 F), the material had nominal strengths of 180,000 psi yield and 200,000 psi tensile. The alloy's composition: 0.07 C...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001520
EISBN: 978-1-62708-235-8
...” condition required machining of heat treated material and final chrome plating. Cracking of these parts was ultimately prevented by changing the manufacturing procedure to allow for a reheat treatment, consisting of solution treatment and aging of the machined part just prior to plating. For parts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001707
EISBN: 978-1-62708-217-4
... at these temperatures for 4 hours ± 15 minutes. However, since this steel is typically supplied in the solution treated condition, only the aging treatment needs to be carried out during manufacturing of components. In the case of the piston, the aging treatment was carried out at 950°F (510°C) and denoted H950...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001583
EISBN: 978-1-62708-217-4
.... 8 Representative striations observed within the fatigue crack propagation regions of each component. Magnification 5000× Laboratory Heat Treatment Sections of an “A” and “C” rod were re-heat treated and aged to the H1050 condition at ARL, with the intent of determining whether the prior...
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 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: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... that cause a part to fail during heat treatment. The article discusses the problems associated with heating and furnaces, quenching media, quenching stresses, hardenability, tempering, carburizing, carbonitriding, and nitriding as well as potential stainless steel problems and problems associated...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001753
EISBN: 978-1-62708-241-9
... (F temper) condition change rapidly during the first few weeks of room temperature aging, because of natural precipitation hardening. Additional hardening continues thereafter at a progressively slower rate.” After 54 years of service, it is expected that the component was exposed to service...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001547
EISBN: 978-1-62708-225-9
... source of weakness. In one set of springs, failures frequently occurred at the base of the end hooks after a few hundred thousand load cycles. The springs, made from 0.02 in. (0.5 mm) diameter 17-7PH stainless steel wire, were age hardened at 900 F (482 C) for 1 h (CH900 condition) after coiling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001723
EISBN: 978-1-62708-221-1
... ageing was a further factor in promoting brittleness, additional specimens were work-hardened on one sawn edge by hammer blows and others impressed with a notch formed by forcing into the specimen a 1 4 in. dia. hardened steel cylinder. Some were tested immediately afterwards and others after...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001474
EISBN: 978-1-62708-224-2
... to bring about failure in a brittle manner, particularly if, as seems likely, shock loading conditions prevailed at the time of failure. In addition, the material was found to he susceptible to strain-age hardening and, therefore, probably strain-age embrittlement, and it is possible that its notch...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001670
EISBN: 978-1-62708-217-4
... martensite, the aging treatment would restore hardness. Thus, for unaged martensite to be present in the investigated flight cases, they must have been exposed to a high temperature subsequent to fabrication and aging. A possible source for this high temperature exposure is static hot-gas proof testing which...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001346
EISBN: 978-1-62708-215-0
... intergranularly from both the flue gas and steam sides. Enhanced general and grain boundary oxidation coupled with age hardening of the alloy led to the formation of incipient intergranular cracks that acted as sites for the initiation of the fatigue cracks. References References 1. Orr J...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001031
EISBN: 978-1-62708-214-3
..., is used for the liner, with cooling channels machined into it through which LH is pumped ( Fig. 1 ). NARloy-Z is a copper-base alloy containing 3% Ag and 0.5% Zr. Silver acts as a precipitation hardener, and zirconium acts as a getter for soluble oxygen. The NARloy-Z goes through a fabrication process...
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
... depth. (b) Induction hardening. SHD, surface-hardness depth. Source: Ref 1 , 2 For materials that would not reach those hardness levels after heat treatment, the following correction factors for the static ( C 0 ) and dynamic ( C ) load-carrying capacities may be used ( Fig. 5 ). Fig. 5...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001020
EISBN: 978-1-62708-214-3
... calculations for the affected components showed adequate safety margins well within regulation limits. This was confirmed by a nearly 30-year period of satisfactory service and component performance. The oleo cylinder forging was identified as an age-hardenable aluminum alloy (type 7014) of British origin...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001268
EISBN: 978-1-62708-215-0
...) were given an age-hardening heat treatment in accordance with the governing specification (AMS 5996). This treatment consisted of initially heating the coupons to 720°C (1325°F) for 8 h and then cooling the furnace to 620°C (1150°F) until a total heat treatment time of 18 h was obtained. Coupons 6...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... Abstract The U-0.8wt%Ti alloy is often used in weapon applications where high strength and fairly good ductility are necessary. Components are immersion quenched in water from the gamma phase to produce a martensitic structure that is amenable to aging. Undesirable conditions occur when...