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hypoeutectoid structure

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Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... the eutectic are referred to as hypereutectic cast irons. Likewise, steels with carbon below the eutectoid are referred to as hypoeutectoid steels , while steels with carbon above the eutectoid are referred to as hypereutectoid steels (as described further in Chapter 2 ). Note that any...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
..., hypoeutectoid, and hypereutectoid structures and how they are affected by the addition of various alloying elements. The chapter also discusses the formation of peritectoid structures in the uranium-silicon alloy system. eutectoid structures eutectoid transformation hypereutectoid structures...
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 November 2007
DOI: 10.31399/asm.tb.smnm.t52140009
EISBN: 978-1-62708-264-8
... (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 microstructure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560283
EISBN: 978-1-62708-291-4
... precipitation, the decomposition of retained austenite, and recovery and recrystallization. It also includes images that reveal the characteristic structures produced by tempering medium-carbon hypoeutectoid and hypereutectoid steels as well as the effects of plastic deformation, austenitic grain size, and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560361
EISBN: 978-1-62708-291-4
..., and uniformity. It provides examples of oxides that form beneath the surface of steel and explains why it occurs. It describes the conditions associated with decarburization and explains how to determine the depth of decarburized layers in eutectoid, hypoeutectoid, and hypereutectoid steels. It also...
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...
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
... and high ductile-to-brittle transition temperatures can cause catastrophic failures. Today, high-strength low-alloy (HSLA) steels are replacing conventional hypoeutectoid steels in many structural applications. The HSLA steels ( Chapter 20, “Alloy Steels,” in this book), which have very low carbon...
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.t59310029
EISBN: 978-1-62708-326-3
... steels, the two-phase structure during cooling is composed of austenite and cementite, and so the cementite forming prior to the eutectoid reaction is called proeutectoid cementite ( Fig. 20b ) Fig. 20 Formation of (a) proeutectoid ferrite in hypoeutectoid steel and (b) proeutectoid cementite in...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560125
EISBN: 978-1-62708-291-4
... content up to about 0.8% (the eutectoid composition of these steels should be close to 0.77% C), and an increase in the volume fraction of proeutectoid cementite with further increase in carbon content. The lamellar spacing of the pearlite in all hypoeutectoid steels in this series is much the same, and...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560029
EISBN: 978-1-62708-291-4
... transformation products form during slow cooling. Other alloys contain a proeutectoid phase that forms before the eutectoid transformation takes place. The proeutectoid phase is ferrite in hypoeutectoid steels (<0.8% C) and cementite in hypereutectoid steels (>0.8% C). During cooling, transformation of...
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 carbon having a maximum of 2.0 wt.% carbon are called steels. An alloy of iron and carbon with 0.8 wt.% carbon is called eutectoid steel; that containing less than 0.8 wt.% carbon is called hypoeutectoid steel; and that having greater than 0.8 wt.% carbon is called hypereutectoid steel. Alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480075
EISBN: 978-1-62708-318-8
... beta. Figure 4.14 also shows typical TTT curves for a composition D in a beta-eutectoid system. This diagram illustrates the transformation of a hypoeutectoid alloy discussed previously. The beta initially transforms to alpha plus beta, and eventually, equilibrium phases alpha plus intermetallic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410039
EISBN: 978-1-62708-265-5
... below the A 3 temperature in steels that contain less than the eutectoid carbon content ( hypoeutectoid steels), and cementite forms below the A cm in steels containing more than the eutectoid carbon content ( hypereutectoid steels). The ferrite and cementite that form prior to the eutectoid...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410277
EISBN: 978-1-62708-265-5
... classical pearlite ( Ref 13.3 ). Critical to the operation of divorced eutectoid transformation is the presence of spheroidized carbides in austenite, a condition that is built into intercritical austenitizing for annealing of hypereutectoid steels, but which also may occur in hypoeutectoid steels because...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410163
EISBN: 978-1-62708-265-5
... fine lamellar ferrite-cementite spacing of the pearlite. Many other good examples of ferrite-pearlite banding are shown in the literature, especially those included in the text by Samuels ( Ref 9.62 ). Banding in hypoeutectoid steels is explained by the effect of alloying elements on the Ar 3...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560165
EISBN: 978-1-62708-291-4
... of pearlite in hypereutectoid steels occurs at much the same rate as in hypoeutectoid steels, but spheroidization of grain-boundary allotriomorphs of proeutectoid cementite occurs at a much faster rate than spheroidization of the cementite in pearlite ( Fig. 7.4 (Part 1) a to d ; compare, in...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850410
EISBN: 978-1-62708-260-0
... Abstract This chapter covers the emerging practice of quantitative microscopy and its application in the study of the microstructure of metals. It describes the methods used to quantify structural gradients, volume fraction, grain size and distribution, and other features of interest. It...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560005
EISBN: 978-1-62708-291-4
... evidence, which suggested that in hypereutectoid steels the active nucleus is cementite, whereas in hypoeutectoid steels the active nucleus is ferrite ( Ref 93 ). Hillert denied that nucleation of pearlite could be defined in any simple way and described the genesis of the structure in terms of gradual...