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austenite decomposition

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Published: 01 December 2004
Fig. 4 Time-temperature-transformation diagram showing austenite decomposition into pearlite and bainite. Source: Ref 4 , p 333 More
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006300
EISBN: 978-1-62708-179-5
... Abstract This article discusses the stable and metastable three-phase fields in the binary Fe-C phase diagram. It schematically illustrates that austenite decomposition requires accounting for nucleation and growth of ferrite and then nucleation and growth of pearlite in the remaining...
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Published: 01 August 2013
Fig. 3 Schematic iron-carbon phase diagram (left). Austenitization time-temperature diagram illustrating kinetics of isothermal austenite formation upon heating (upper right) and time-temperature-transformation diagram representing isothermal austenite decomposition upon cooling (lower right More
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Published: 01 December 1998
Fig. 4 The procedure for determining isothermal cooling (IT) diagrams. Line 1: Temperature versus time. Line 2: Elongation versus time. S represents the start and F the finish of austenite decomposition. More
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Published: 01 October 2014
Fig. 9 (a) Continuous cooling transformation diagrams of DIN 22CrMo44 steel showing austenitic decomposition with the superimposed cooling curves of the surface and center during water quenching of round bars of varying dimensions. (b) The corresponding residual-stress pattern developed More
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003739
EISBN: 978-1-62708-177-1
... in nonferrous systems. bainite ferrous metals nonferrous metals surface relief BAINITE describes the resultant microstructure in steels of the decomposition of austenite (γ) into ferrite (α) and cementite (Fe 3 C) in the temperature range above the martensitic transformation and below...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006319
EISBN: 978-1-62708-179-5
... Abstract The transformation of austenite of cast irons represents a more complex and less studied subject. This article discusses the general features of the decomposition of austenite into bainite. It describes the heat treatment cycles of austempered cast iron microstructure. The article...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005959
EISBN: 978-1-62708-168-9
... by a discussion on physical metallurgy, including crystallographic identity, thermal stability and decomposition, nitrogen and carbon solubility in expanded austenite, and diffusion kinetics of interstitials. It provides a description of low-temperature nitriding and nitrocarburizing processes for primarily...
Image
Published: 01 December 2004
Fig. 22 Temperature-composition regions indicating the morphological tendencies of proeutectoid ferrite and cementite from isothermal decomposition of large-grain (ASTM 0 to 1) and small-grain (ASTM 7 to 8) austenite. See also Fig. 23 for descriptions of GBA, grain-boundary allotriomorphs; W More
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005786
EISBN: 978-1-62708-165-8
... microstructure. Such austenite is referred to as retained austenite, resulting from incomplete transformation/decomposition during cooling from a previous processing step or sequence of steps. Fig. 1 Iron-carbon binary phase diagram, where solid lines indicate the metastable Fe-Fe 3 C diagram and dashed...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005966
EISBN: 978-1-62708-166-5
..., Fe 3 O 4 , and Fe 2 O 3 , with FeO forming directly at the interface with the steel (although not all layers may be obvious). Beneath the oxide layers is a zone containing ferrite (white etching grains) comingled with austenite decomposition product. At the bottom, the structure becomes solely...
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Published: 01 October 2014
Fig. 6 Calculated isothermal stability plot of expanded austenite in AISI 304 and AISI 316 based on isochronal annealing data. The graphs show the time to reach 50% decomposition. Source: Ref 65 More
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Published: 01 January 2002
Fig. 4 Hot-rolled 1022 steel showing severe banding. Bands of pearlite (dark) and ferrite were caused by segregation of carbon and other elements during solidification and later decomposition of austenite. Nital. 250×. Courtesy of J.R. Kilpatrick More
Image
Published: 30 August 2021
Fig. 3 Hot rolled 1022 steel showing severe banding. Bands of pearlite (dark) and ferrite were caused by segregation of carbon and other elements during solidification and later decomposition of austenite. Nital etch. Original magnification: 250×. Courtesy of J.R. Kilpatrick More
Image
Published: 01 October 2014
Fig. 6 Plan view thin-foil bright-field transmission electron microscopy image showing grains A, B, and C of expanded austenite and their respective selected-area electron diffraction patterns. Some phase-decomposition regions are indicated on the B grain surface (white arrows More
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Published: 01 January 1996
Fig. 21 Electron micrographs of aged type 308 weld. (a) Aged at 475 ° C for 1000 h, showing mottled structure indicative of spinodal decomposition of the δ-ferrite and extensive G-phase precipitation. (b) Aged at 475 °C for 4950 h, showing M 23 C 6 carbides at austenitic-ferrite interface More
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005414
EISBN: 978-1-62708-196-2
... decomposition, primarily due to the complexities involved in modeling phase transformations. In recent years, there has been a growing emphasis on modeling of austenite decomposition. Recent advances in finite-element modeling of metal deformation processes, coupled with advances in materials characterization...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005962
EISBN: 978-1-62708-168-9
... is metastable, the decomposition kinetics are very sluggish even at elevated temperatures. It is a very hard and brittle phase that provides significant strengthening. Bainite Bainite is a microconstituent that forms during decomposition of austenite in some copper steels. It is composed of ferrite...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005587
EISBN: 978-1-62708-174-0
... ∈ Ω , t = 0 The known functions, that is, data, are F D , F N , F init , and ρ init . To include the effect of phase transformations, such as liquid to solid and the decomposition of austenite in low-alloy steels, it would be necessary to have equations describing the evolution...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005882
EISBN: 978-1-62708-167-2
.... Fig. 2 Effect of carbon content on martensite-start temperature for 51 xx family of alloy steels. Source: Ref 1 Modeling of Austenite Formation and Decomposition Mathematical models required to simulate the metallurgical transformations that drive stress evolution in the component...