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austenite dendrites

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140175
EISBN: 978-1-62708-264-8
... will increase its %C to the eutectic value of 4.3 at the base of the dendrites, where the temperature drops to 1148 °C (2100 °F), and the cementite carbide (Fe 3 C) will form from the liquid as a eutectic mixture of austenite + Fe 3 C. [1] However, on cooling to 1100 °C (2010 °F), this Fe 3 C can dissolve...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140165
EISBN: 978-1-62708-264-8
... deliberately added to the iron to make steels, such as manganese, carbon, and alloying elements, become microsegregated between the dendrites in the as-solidified steel. This phenomenon can lead to formation of particles of compounds in the austenite on cooldown that would not be expected. To understand how...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220583
EISBN: 978-1-62708-259-4
.... Fig. 17.12 (a) Hypoeutectic white cast iron. Austenite dendrites were transformed into pearlite (dark). The transformed ledeburite, among the dendrites, is composed of cementite (white) and pearlite (dark, small dots). Etchant: nital. (b) Another hypoeutectic white cast iron. Austenite dendrites...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400023
EISBN: 978-1-62708-258-7
... A drawing of a dendrite Fig. 2.54 Plate martensite transformation in the primary austenite dendrites of an alloy (Ni-Hard) white cast iron (2.95% C, 0.63% Mn, 0.73% Si, 3.08% Ni, and 2.17% Cr). 4% picral etch. 500× Fig. 2.55 Additional formation of plate martensite in the same sample...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060247
EISBN: 978-1-62708-261-7
.... For example, when an iron with 2.5% C is cooled below the liquidus line ( Fig. 10.1 ), freezing begins first with the formation of austenite dendrites (called proeutectic austenite). These dendrites grow and new dendrites form as the temperature drops through the freezing range, and the carbon content...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220129
EISBN: 978-1-62708-259-4
... of ArcelorMittal Tubarão, Brazil. Fig. 8.18 (a) Primary austenite dendrites in a pore of a sample of ductile cast iron. (b) Grains of the austenite-spheroidal graphite in the same pore. Some regions show graphite not completely surrounded by austenite. SEM, SE, no etching. (See also Chapter 17, “Cast...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170242
EISBN: 978-1-62708-297-6
... suppresses the formation of both embrittling carbide precipitates and pearlite, even when the austenite is exposed to temperatures above 275 °C (530 °F) during welding or in service. The molybdenum in primary carbides tends to change the morphology from continuous envelopes around austenite dendrites...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... ( Fig. 5.13 ). In this case, there is no cooperative eutectic-like growth of both phases; instead, there is separate growth of spheroidal graphite particles as a primary phase (at least during the initial stages), together with austenite dendrites, known as divorced growth. Cast iron often exhibits...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560125
EISBN: 978-1-62708-291-4
... , 63 , 939 . 4. Hillert M. , Decomposition of Austenite by Diffusional Processes , Zackay V.F. and Aaronson H.I. , Ed., Interscience , New York , 1962 , p 197 . 5. Darken L.S. and Fisher R.M. , Decomposition of Austenite by Diffusional Processes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410163
EISBN: 978-1-62708-265-5
... and eliminated, and coarse dendritic microstructures are refined by ferrite-austenite phase transformations on heating and cooling and by deformation and recrystallization during hot work. Inclusions cannot be removed, but as already described, may be changed in size, shape, and distribution by hot work...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400049
EISBN: 978-1-62708-258-7
... and upper bainite in the interdendritic regions. The gear received a final heat treatment of austenitizing, quenching, and tempering, and the resulting microstructure is martensitic and is shown in Fig. 3.21(c) . Even after heat treatment, there is some evidence of the original dendritic structure. However...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850001
EISBN: 978-1-62708-260-0
... from an AISI 1050 billet revealed a “cokey” center, inclusion pits, and a dendritic pattern. Figure 1-9 Microstructure in “cokey” like center of etch disc shown in Fig. 1-8 revealing the depth of the etch attack (2% nital, 75 ×). Figure 1-10 Hot-acid etching of this disc from...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220551
EISBN: 978-1-62708-259-4
... Solidification sequences typical of austenitic stainless steels. Besides the primary phase forming from the liquid, the important morphological aspects of the as-cast product are also indicated. A = austenite, F = ferrite, Ac = acicular, N = lacy or network, Vm = vermicular or skeleton, D = dendritic, ID...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220353
EISBN: 978-1-62708-259-4
... stresses (σ H ) are essential to cause the consolidation and elimination of “cavities” (pores, shrinkage cavity, etc.). Unfavorable stress states may even lead to rupture during forming. Source: Ref 2 Fig. 11.4 The effect of hot working on the macrostructure of a steel. (a) Dendritic structure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420117
EISBN: 978-1-62708-310-2
... of austenite (gray) around the highly branched dendrites of δ-ferrite (discontinuously transformed to austenite and carbide, dark) are clearly distinguishable. The matrix is fine ledeburite (white). Original magnification: 60×. Source: Ref 6.8 as published in Ref 6.4 Fig. 6.17 Longitudinal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770099
EISBN: 978-1-62708-337-9
... Somewhat coarsened; solution of excess carbide favored; austenite retention promoted in highly alloyed steels Refined; maximum core strength and hardness; better combination of strength and ductility than B D: Best treatment for coarse-grained steels Refined; solution of excess carbide favored...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730011
EISBN: 978-1-62708-283-9
... The copper-tin phase diagram. Source: Ref 2.3 Another important reaction occurs in the iron-carbon phase diagram ( Fig. 2.8 ). Above 727 °C (1340 °F) iron containing 0.77% carbon has a face-centered cubic structure (γ) called austenite. On cooling through 727 °C (1340 °F), austenite transforms...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560185
EISBN: 978-1-62708-291-4
...Abstract Abstract This chapter examines the structural changes that occur in high-carbon steels during austenitization. It describes the effect of heating time and temperature on the production of austenite and the associated transformation of ferrite and cementite in eutectoid, hypoeutectoid...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410621
EISBN: 978-1-62708-265-5
... the dendrite arms. The remaining liquid is enriched in carbide-forming elements, and final solidification occurs by complex eutectic solidification, which produces several morphologies of carbides and austenite. Figure 24.8 shows examples of feathery (austenite plus M 6 C and MC), herringbone (austenite plus...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310201
EISBN: 978-1-62708-286-0
... alloyed grades also suffer from greater microsegregation during solidification. This causes austenitic dendritic cores to have lower chromium and molybdenum content and consequently lower corrosion resistance. Thus, the welds have lower resistance to localized corrosion. This is addressed by using more...