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proeutectoid ferrite

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Published: 01 January 1990
Fig. 7 Light micrograph showing microstructure of proeutectoid ferrite (white) and pearlite (dark) in a 0.17C-1.2Mn-0.19Si steel More
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Published: 01 August 2013
Fig. 19 Formation of (a) proeutectoid ferrite in hypoeutectoid steel and (b) proeutectoid cementite in hypereutectoid steel More
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Published: 01 August 2013
Fig. 35 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 resulted in most More
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Published: 01 December 2004
Fig. 45 Typical shapes of proeutectoid ferrite (the light-etching phase) in the grain boundaries (A), protruding into the grain interiors as needlelike (acicular) features (B), and chunky form at triple points (C). 5% nital etch. Original magnification 500× More
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001008
EISBN: 978-1-62708-161-0
... and the phase transformations that change the structure and properties at varying levels of carbon content. Microstructures described include pearlite, bainite, proeutectoid ferrite and cementite, ferrite-pearlite, and martensite. The article depicts some of the primary processing steps that result in ferrite...
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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
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Published: 01 December 2004
Fig. 21 Isothermal transformation (IT) diagram of a hypoeutectoid carbon steel (0.55C-0.08Si-0.60Mn, wt%). Proeutectoid ferrite forms first, starting below the critical temperature of γ-to-α transformation (A 3 ). The transformation region of proeutectoid ferrite (α + γ) ceases near the nose More
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Published: 01 December 2004
furnaces (pit type), except for last two examples. (a) Carburized for 2 h, with resulting surface carbon content between 0.60 to 0.70%. The structure is pearlite with proeutectoid ferrite (light) outlining prior-austenite grain boundaries. (b) Carburized for 4 h, with surface carbon content between 0.70 More
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Published: 01 December 2004
Fig. 6 Typical optical micrograph of an isothermally transformed Fe-3Ni-0.1C alloy showing proeutectoid ferrite precipitates. Source: Ref 26 More
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Published: 01 December 2004
Fig. 1 Microstructure of plain carbon UNS G10400 steel showing equiaxed proeutectoid ferrite grains outlining the prior-austenite grain boundaries. The matrix is pearlite (dark etching constituent). 4% picral etch. Original magnification 200× More
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Published: 15 January 2021
Fig. 6 Valve springs made from patented and drawn high-carbon steel wire. Distorted outer spring (a) exhibited approximately 25% set because of proeutectoid ferrite in the microstructure and high operating temperature. Outer spring (b) is satisfactory More
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Published: 01 January 2002
Fig. 6 Valve springs made from patented and drawn high-carbon steel wire. Distorted outer spring (left) exhibited about 25% set because of proeutectoid ferrite in the microstructure and high operating temperature. Outer spring (right) is satisfactory. More
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Published: 01 October 2014
Fig. 21 Photomicrograph of GR 750-500-11 ADI showing the presence of a mixed microstructure of proeutectoid ferrite and ausferrite produced by austenitizing in an intercritical range before austempering at 370 °C (700 °F). Etched with 5% Nital. Courtesy of Applied Process, Inc. More
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Published: 31 August 2017
Fig. 21 Micrograph of GR 750-500-11 austempered ductile iron showing the presence of a mixed microstructure of proeutectoid ferrite and ausferrite produced by austenitizing in an intercritical range before austempering at 370 °C (700 °F). Etched with 5% nital. Courtesy of Applied Process, Inc. More
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Published: 15 December 2019
Fig. 8 Microstructure of annealed (870 °C, or 1600 °F, for 1 h, slow cooled) SAE 4140 alloy steel (Fe-0.4%C-0.85%Mn-0.95%Cr-0.2%Mo) etched using 4% picral (a) and 2% nital (b), revealing proeutectoid ferrite and coarse lamellar pearlite. Nital, because it is sensitive to crystal orientation More
Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006228
EISBN: 978-1-62708-163-4
... to approximately 800 °C (1475 °F) (point b ), the alloy enters the two-phase α + γ phase field. Small particles of ferrite start forming along the austenite grain boundaries. This ferrite is called proeutectoid ferrite because it forms prior to cooling through the eutectoid temperature. This is in contrast...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003763
EISBN: 978-1-62708-177-1
... of this microstructure is the ferrite formed on the original or prior-austenite grain boundaries during cooling from austenite. Ferrite in this form is called proeutectoid ferrite and is described later in this article. Figure 2 shows the microstructure of an as-rolled UNS G10150 steel plate. The microstructure also...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005819
EISBN: 978-1-62708-165-8
... steels, the ferrite that forms before the eutectoid reaction is termed proeutectoid ferrite ( Fig. 19a ), while the cementite that forms before the eutectoid reaction in hypereutectoid steels is termed proeutectoid cementite ( Fig. 19b ). Fig. 19 Formation of (a) proeutectoid ferrite...
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
... proeutectoid ferrite and austenite. The composition of austenite will be about D C, and the composition of proeutectoid ferrite will be about F C . Upon cooling to ambient temperature, the austenite transforms to one or more of the constituents (ferrite, pearlite, bainite, and martensite) depending...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003723
EISBN: 978-1-62708-177-1
... in steel can have different morphologies, ranging from a spheroidized shape to a fine, alternating platelet morphology known as pearlite. Pearlite is a two-phase structure of cementite (Fe 3 C) and ferrite with a distinctive appearance of alternating thin and thick platelets, often in a swirling pattern...