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eutectoid transformation

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410039
EISBN: 978-1-62708-265-5
... precipitation, and various types of transformations. alloying elements cementite eutectoid transformation ferrite microstructure pearlite proeutectoid structure CHAPTER 3, “PHASES AND STRUCTURES,” DESCRIBES the crystal structures of the phases that form in steels and the Fe-C phase diagram...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
... Abstract This chapter discusses the characteristics of eutectoid transformations, a type of solid-state transformation associated with invariant reactions, focusing on the iron-carbon system of steel. It describes the compositions, characteristics, and properties of ferrite, eutectoid...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140009
EISBN: 978-1-62708-264-8
... where one solid transforms into two solids. The eutectoid point in the iron-carbon system has a composition of 0.77% C, and steels with compositions less than this value are called hypoeutectoid steels. The eutectoid temperature is traditionally called the A 1 temperature. Fig. 3.3 Portion of...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560221
EISBN: 978-1-62708-291-4
... Abstract This chapter discusses the isothermal transformation of austenite to pearlite, bainite, martensite, proeutectoid ferrite, and proeutectoid cementite. It describes the transformation mechanisms in eutectoid, hypoeutectoid, and hypereutectoid steels, the factors that influence nucleation...
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: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310055
EISBN: 978-1-62708-326-3
... quenchant for use with low-hardenability carbon steels and high-hardenability alloy steels, in addition to thick or thin section size. Source: Ref 15 Fig. 17 Effect of cooling times on steel transformation product formation for a eutectoid steel Fig. 18 Cooling time-temperature curves...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480075
EISBN: 978-1-62708-318-8
... equilibrium alpha phase or isothermal omega, beta prime, or eutectoid compound plus alpha. Although less important commercially, the alpha phase can also decompose to form ordered alpha-two phase or compound. Therefore, by controlling beta transformation and a variety of microstructures, thus mechanical...
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 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, and metallurgy. The...
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 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, and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220101
EISBN: 978-1-62708-259-4
... is a three-phase equilibrium between ferrite, cementite, and austenite; at atmospheric pressure, it occurs at 723 °C (1335 °F). When steels containing higher carbon contents transform from the austenite field to the field below the eutectoid temperature, ferrite and cementite are the expected phases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560029
EISBN: 978-1-62708-291-4
... carbon in ferrite. The dominant features of the Fe-Fe 3 C diagram are the widely different solubilities of carbon in ferrite and in austenite and the associated eutectoid transformation at 727 °C that gives rise to the range of microstructures and associated properties that underlie the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560361
EISBN: 978-1-62708-291-4
... oxide (hematite) in contact with the atmosphere. Under equilibrium conditions, wüstite formed at high temperatures decomposes at temperatures below 570 °C to magnetite and iron by a eutectoid transformation ( Fig. 12.1 (Part 3) i ). This transformation is similar in principle to that of the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420015
EISBN: 978-1-62708-310-2
... cooling, although the mechanism requires rapid heating and cooling rates, because the ability of atoms to diffuse the long distances typical of diffusion-controlled transformations is impaired. Important solid-state transformation structures include eutectoid and peritectoid structures, martensitic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400023
EISBN: 978-1-62708-258-7
... 0.77% C and 727 °C (1340 °F). This point is called the eutectoid point. (The eutectoid point is the composition of a solid phase that undergoes transformation into two or more other solid phases upon cooling.) There is another point at 4.3% C and 1148 °C (2100 °F) on the iron-carbon diagram (see Fig...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440009
EISBN: 978-1-62708-262-4
... transformation, the simplest approach is by means of a time-temperature-transformation (TTT) curve for some constant iron-carbon composition. Such a curve is presented in Fig. 6 for a 0.77% (eutectoid) carbon steel. TTT curves are also known as “S” curves because the principal part of the curve is shaped...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420303
EISBN: 978-1-62708-310-2
... transformation product in the microstructure on a temperature-time plot in the manner shown in Fig. 15.3 . A fully developed TTT curve with the transformation products marked on the diagram is shown for the eutectoid plain-carbon steel 1080 in Fig. 15.4 , which nominally contains 0.8 wt% C. Fig. 15.1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060197
EISBN: 978-1-62708-261-7
... strengthened by heat treatment. Steel is made by dissolving carbon in iron, and important strengthening effects can be produced in steel alloys by inducing specific phase changes to occur through heat treatment. Specifically, the iron-carbon system involves a so-called eutectoid phase transformation that...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220193
EISBN: 978-1-62708-259-4
... optimize growth conditions: at relatively low temperatures and thus high driving force for transformation, it is convenient to have a short diffusion path ( Fig. 9.7 ), even at the cost of increasing the interfacial area inside pearlite. Conversely, at temperatures close to the eutectoid temperature where...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410099
EISBN: 978-1-62708-265-5
... drag on bainite formation mechanisms. It also discusses the development of ferrite-carbide bainites and their effect on toughness, hardness, and ductility. bainite bainitic transformation ferrite mechanical behavior AT TEMPERATURES between those at which the eutectoid...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220273
EISBN: 978-1-62708-259-4
... treatment cycles for annealing (full) and normalizing, superimposed on a CCT curve of a hypothetical steel. A = austenite, P = pearlite, F = ferrite. Fig. 10.15 AISI 1045 wire rod normalized. Pro-eutectoid ferrite and pearlite. Etchant: nital 2%. Courtesy of ArcelorMittal Aços Longos, Juiz de Fora...