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subcritical temperature

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Published: 01 October 2014
Fig. 8 Influence of time at subcritical annealing temperature on hardness More
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Published: 31 August 2017
Fig. 8 Influence of time at subcritical annealing temperature on hardness More
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Published: 01 January 2006
Fig. 6 Dealloying of a C276 alloy tube after exposure to an aggressive chlorinated environment at a high subcritical temperature. Original magnification 300× More
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005790
EISBN: 978-1-62708-165-8
... Abstract This article describes the metallurgy and process specifics of subcritical annealing, which involves heating below the lower critical temperature such that austenite does not form during subcritical annealing. It provides information on the nominal subcritical annealing temperatures...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004132
EISBN: 978-1-62708-184-9
... essentially all of the nickel component and is friable ( Ref 31 ). Fig. 6 Dealloying of a C276 alloy tube after exposure to an aggressive chlorinated environment at a high subcritical temperature. Original magnification 300× There is evidence for a correlation between chromium content...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005787
EISBN: 978-1-62708-165-8
... is heated and the method of cooling used. The maximum temperature may be below the lower critical temperature, A 1 (subcritical annealing); above A 1 but below the upper critical temperature, A 3 in hypoeutectoid steels, or A cm in hypereutectoid steels (intercritical annealing); or above A 3 (full...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005873
EISBN: 978-1-62708-167-2
... Abstract Tempering of induction-hardened steel is a form of subcritical heat treatment, primarily carried out to increase ductility, toughness, and dimensional stability, to relieve residual stresses, and to obtain specific values of mechanical properties. This article describes tempering...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004133
EISBN: 978-1-62708-184-9
... subcritical and supercritical conditions. It delivered steam at 34.1 MPa (5.0 ksi) and 621 °C, with two reheats of 566 and 538 °C. The pressure and temperatures of the primary, first reheat (if present), and second reheat (if present) are designated by a nomenclature such as 34.1 MPa/621 °C/566 °C/538 °C...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005988
EISBN: 978-1-62708-168-9
... to reach uniform temperature within the casting. After temperature is equalized, the castings are either furnace- or still-air-cooled to ambient temperature. Tempering Castings can be put into service in the hardened (as cooled) condition without further tempering or subcritical heat treatments...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006305
EISBN: 978-1-62708-179-5
... temperature within the casting. After temperature is equalized, the castings are either furnace or still-air-cooled to ambient temperature. Tempering Castings can be put into service in the hardened (as-cooled) condition without further tempering or subcritical heat treatments; however, tempering...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003391
EISBN: 978-1-62708-195-5
... compression specimens due to lay-up. RTA is Room Temperature ambient. Source: Ref 4 Stress and strain fields for notched anisotropic materials such as composite laminates can be determined using close-formed solutions such as those used by Lekhnitskii ( Ref 5 ) or by finite element and finite...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006332
EISBN: 978-1-62708-179-5
... irons. It explains the heat treatment of high-silicon irons for high-temperature service and concludes with a discussion on machining and finishing of high-alloy iron castings. castability finishing fluidity heat treatment high-alloy graphitic iron high-alloy iron casting high-alloy white...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003554
EISBN: 978-1-62708-180-1
... of the situation. Furthermore, those cases where such embrittlement extends below the melting temperature of the embrittling metal, formerly known as stress alloying, are now termed solid metal induced embrittlement (SMIE). In either case, the metal-induced embrittlement is the result of subcritical crack growth...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005985
EISBN: 978-1-62708-168-9
... longer to dissolve at austenitizing temperatures. Temperatures and resulting hardnesses for process (subcritical) annealing, full annealing, and isothermal annealing are given in Table 5 . Annealing temperatures and procedures for wrought martensitic stainless steels Table 5 Annealing...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005970
EISBN: 978-1-62708-168-9
...) for several hours, followed by slow cooling to below 700 °C (1300 °F). At higher silicon contents (>5%), in which carbides readily break down, and in castings relatively carbide-free, subcritical annealing in the temperature range 720 to 790 °C (1325 to 1450 °F) for 4 h is effective in ferritizing...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006786
EISBN: 978-1-62708-295-2
... in fracture stress with no observable change in the flow characteristics of the structural metal, as subcritical crack growth or as delayed failure under static load. For any given combination of structural metal and embrittling metal, there exist temperatures below and above which...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003116
EISBN: 978-1-62708-199-3
... (process annealed) by heating into the upper part of the ferrite temperature range or full annealed by heating above the critical temperature into the austenite range, followed by slow cooling. Usual temperatures are 760 to 830 °C (1400 to 1525 °F) for subcritical annealing and 845 to 900 °C (1550 to 1650...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005862
EISBN: 978-1-62708-167-2
..., and quench severity (cooling rates). For example, when steel bars are slowly cooled from a subcritical temperature (i.e., below the lower critical A c 1 ), different patterns of residual stress form depending on whether the bar is surface heated or throughheated ( Fig. 3 ). For a surface-heated bar...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0005547
EISBN: 978-1-62708-161-0
....a0005547 Abbreviations, Symbols, and Tradenames Abbreviations and Symbols Arcm temperature at which cementite CSA Canadian Standards Association begins to precipitate from austenite CSD controlled spray deposition a crack length; edge length in crystal on cooling CSP compact strip production structure C1...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003633
EISBN: 978-1-62708-182-5
... simultaneous environmental exposure and application of stress will cause time-dependent subcritical crack propagation. The term synergy was used to describe this process because the combined simultaneous interaction of mechanical and chemical forces results in crack propagation where neither factor acting...