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hypoeutectoid microstructure

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240153
EISBN: 978-1-62708-251-8
...Abstract Abstract This chapter examines the isothermal phase transformations of the iron-carbide system. The discussion includes the formation of ferritic, eutectoid, hypoeutectoid, hypereutectoid, bainitic, and martensitic microstructures as well as their properties, composition...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560221
EISBN: 978-1-62708-291-4
... (Part 1) Proeutectoid ferrite and pearlite formation in isothermal transformation of 0.55% C hypoeutectoid steels. 0.55C-0.08Si-0.60Mn (wt%). (a) Austenitized at 860 °C, transformed at 705 °C for 20 s. Picral. 500×. (b) Austenitized at 860 °C, transformed at 705 °C for 2 min. Picral. 500×. (c...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140009
EISBN: 978-1-62708-264-8
...-carbon (hypoeutectoid) and high-carbon (hypereutectoid) steels are made, how they are classified, and how they compare. It also describes eutectoid steels which, at 0.77 wt% C, form a separate class noted for its microstructure. chemical composition eutectoid steel iron-carbon phase diagram...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410197
EISBN: 978-1-62708-265-5
... treating eutectoid, hypoeutectoid, and proeutectoid steels. It also provides references to large collections of transformation diagrams and includes several diagrams that plot quenching and hardening transformations as a function of bar diameter. continuous cooling transformation diagram isothermal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
.... Fig. 8.19 Equilibrium cooling of a proeutectoid steel. Source: Ref 8.3 The microstructure of a hypoeutectoid steel depends on how rapidly it is cooled from the austenitic phase region. Very slow cooling, such as furnace cooling, will result in the formation of proeutectoid ferrite...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140021
EISBN: 978-1-62708-264-8
... of the hypoeutectoid steels (%C less than approximately 0.2), ferrite grains become the dominant component, with the pearlite distributed in various forms. Wrought steels often show a banded microstructure, with alternating bands of ferrite grains and pearlite grains aligned in the direction of the prior mechanical...
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
..., water quenched. Arrows indicate microcracks in the martensite plate. 905 HV. Picral. 1000×. Fig. 8.5 (Part 1) Austenitization of hypoeutectoid steels. Original structures: pearlite and proeutectoid ferrite. (a) to (d) 0.4% C, annealed. 0.39C-0.22Si-0.75Mn (wt%). (a) As-annealed. 215 HV...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1996
DOI: 10.31399/asm.tb.phtpclas.t64560003
EISBN: 978-1-62708-353-9
... and Engineering , Wiley, New York (1985). Reprinted by permission of John Wiley & Sons, Inc., Ref 5 ) Fig. 2-6(b) Microstructures showing primary ferrite and pearlite in hypoeutectoid steels cooled slowly from austenite. In optical microscopy, the primary ferrite appears white, but in scanning...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560283
EISBN: 978-1-62708-291-4
... tempered for 30 min. The relevant microstructures are shown in Fig. 10.3 and 10.4 . Fig. 10.6 (Part 1) Tempering of a medium-carbon (0.4%) hypoeutectoid steel. 0.43C-0.18Si-0.75Mn (wt%). These micrographs constitute part of the series shown in Fig. 10.3 to 10.6 . (a) Austenitized at 850...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060197
EISBN: 978-1-62708-261-7
... annealing are a supercritical anneal for hypoeutectoid steels, but are in the range of an intercritical anneal for hypereutectoid steels. To emphasize how a phase diagram can help understand microstructure development during heat treatment, compare Fig. 9.8 with the right side of Fig. 9.5b . When...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560361
EISBN: 978-1-62708-291-4
... the surface (arrows) are segregated regions differing slightly in M s temperature from the bulk of the material. 1% nital. 2×. (f) Austenitized, water quenched, tempered at 200 °C. Picral. 2×. Fig. 12.9 (Part 1) Decarburization in a 0.4% C hypoeutectoid steel in the normalized and quenched...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560029
EISBN: 978-1-62708-291-4
... that a microscopical examination of steel is carried out first to identify the various phases and mixtures of phases in the microstructural constituents and, second, to specify the proportions, distributions, and dispersions of these constituents. From these features the origin of the microstructure may be deduced...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430027
EISBN: 978-1-62708-253-2
..., and pearlite. Fig. 3.10 Microstructures of steel, (a) ferrite; 100x; (b) austenite; 200x; and (c) pearlite; 1000x If a hypoeutectoid steel (containing <0.8 wt.% C) is slowly cooled from above the A 3 temperature, ferrite begins to precipitate from austenite. The precipitation of ferrite...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400023
EISBN: 978-1-62708-258-7
...) at the prior austenite grain boundaries in a matrix of pearlite. 4% picral etch. 500× Fig. 2.6 A hypoeutectoid AISI/SAE 1040 steel showing a ferrite (white etching constituent) and pearlite (dark etching constituent) microstructure. 4% picral and 2% nital etch. 800× Fig. 2.8 An isothermal...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310055
EISBN: 978-1-62708-326-3
... treatments, respectively. Fig. 4 Pearlite and proeutectoid ferrite (light areas) in commercially processed bar of a hypoeutectoid steel that was water quenched from 1050 to 805 °C (1920 to 1480 °F) and then air cooled. (a) Cooled from 805 °C (1480 °F) to room temperature in still air, which...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320005
EISBN: 978-1-62708-347-8
.... It addresses the processes involved in the transformation (decomposition) of austenite to achieve various microstructures. austenite transformation iron-carbon phase diagram melting point steel HEATING PURE IRON to its melting point and then allowing it to cool slowly results in an idealized time...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440009
EISBN: 978-1-62708-262-4
...×. Structure is martensitic. (b) Bainitic structure in a quenched 0.95% carbon steel. 550×. Source: Ref 4 Fig. 5 Effects of carbon content on the microstructures of plain-carbon steels. (a) Ferrite grains (white) and pearlite (gray streaks) in a white matrix of a hypoeutectoid steel containing 0.4...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
... (1650 °F); ASTM grain size No. 6. Source: Ref 15 Fig. 20 Formation of (a) proeutectoid ferrite in hypoeutectoid steel and (b) proeutectoid cementite in hypereutectoid steel Fig. 21 Microstructure of typical ferrite-pearlite structural steels at two different carbon contents...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140083
EISBN: 978-1-62708-264-8
... employed in the heat treatment of hardened steels. In order to fully harden the steel bar, the austenite must transform to martensite at all points on the surface to the center of the bar. Consider again the microstructures of the quenched steels shown in Fig. 4.19 and 4.20 . As explained...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140107
EISBN: 978-1-62708-264-8
... will generally consist of ferrite and cementite. In hypoeutectoid steels, the cementite is usually present as pearlite, and in hypereutectoid steels, it will be present either as pearlite or a mixture of pearlite and cementite particles. In plain carbon steels, ferrite is essentially pure iron (Fe+0.02% or less...