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proeutectoid structure

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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
..., 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, which defines...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560125
EISBN: 978-1-62708-291-4
... with proeutectoid ferrite and cementite. It explains how ferrite and pearlite respond to deformation and how related features such as slip lines, dislocations, shear bands, and kinking can be detected as well as what they reveal. It also describes the structure of patented wires, cast steels, and sintered steels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560165
EISBN: 978-1-62708-291-4
...×. We see in Chapter 9 in the section “Microcracks in Martensite” that the objective usually is to obtain an annealed hypoeutectoid steel in a condition where both the proeutectoid and eutectoid cementite are fully spheroidized, so that the structure after austenitizing and quenching can be optimized...
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...
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...
Image
Published: 01 August 1999
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. Picral. 500×. (b) Heated for 15 min at 740 °C, water quenched. Tempered at 200 °C. 440 HV More
Image
Published: 01 August 1999
Fig. 8.5 (Part 2) 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. Picral. 500×. (b) Heated for 15 min at 740 °C, water quenched. Tempered at 200 °C. 440 HV More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560029
EISBN: 978-1-62708-291-4
... Abstract This chapter describes some of the most essential tools in metallurgy and what they reveal about the structure, composition, and processing requirements of steel. It begins by identifying important details in the constitutional diagram of iron-cementite. It then explains how to read...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
... the eutectoid-reaction temperature is reached ( Fig. 20a ). In hypereutectoid 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...
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...
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
..., the volume fraction of austenite retained in the structure, and the number, size, and dispersion of the cementite particles present. Hypoeutectoid Steels Original Structure: Proeutectoid Ferrite and Pearlite Transformation of the pearlitic regions at temperatures above the A 1 temperature occurs...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 January 2024
DOI: 10.31399/asm.tb.pdktmse.t56100019
EISBN: 978-1-62708-470-3
... the microstructure development for a 1 wt% carbon steel using the iron-carbon diagram with points A, B, and C as a guide. Fig. A20 Iron-carbon phase diagram Solution Fig. A21 Microstructure development for a 1 wt% carbon steel Problem 13 Determine the amount of proeutectoid phase...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410113
EISBN: 978-1-62708-265-5
... DESCRIBES ferritic microstructures that form during continuous cooling of carbon steels. Ferritic microstructures identified as proeutectoid ferrite have already been discussed in Chapter 4, “Pearlite, Ferrite, and Cementite,” in this book. These forms of ferrite nucleate as equiaxed grains on austenite...
Image
Published: 01 August 1999
Fig. 8.6 (Part 1) Austenitization of 1.2% C hypereutectoid steel annealed from 970 °C. Original structure: pearlite and proeutectoid cementite. 1.20C-0.2Si-0.5Mn (wt%). Darkest-etching areas in these micrographs were austenitic prior to quenching. (a) As-annealed. 200 HV. Picral. 500×. (b More
Image
Published: 01 August 1999
Fig. 8.6 (Part 2) Austenitization of 1.2% C hypereutectoid steel annealed from 970 °C. Original structure: pearlite and proeutectoid cementite. 1.20C-0.2Si-0.5Mn (wt%). Darkest-etching areas in these micrographs were austenitic prior to quenching. (a) As-annealed. 200 HV. Picral. 500×. (b More
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
... to discuss the iron-carbon system in some detail. Most carbon steels contain up to 1.5% C, while cast irons normally contain 2 to 4% C. As discussed in Chapter 1, “Metallic Structure,” iron is allotropic and changes its crystalline structure on heating or cooling. When pure iron solidifies on cooling from...
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 essential structural difference between this scale and the more rapidly cooled scale illustrated in Fig. 12.2 is that here the wüstite layer has decomposed into a proeutectoid constituent and a eutectoid of iron and magnetite (Fe 3 O 4 ). However, complex local variations in structure occur because...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.9781627083263
EISBN: 978-1-62708-326-3
Series: ASM Technical Books
Publisher: ASM International
Published: 31 January 2024
DOI: 10.31399/asm.tb.pdktmse.9781627084703
EISBN: 978-1-62708-470-3
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560309
EISBN: 978-1-62708-291-4
... structure that have been austenitized and transformed to a finer mixture of proeutectoid ferrite and pearlite during subsequent cooling. The origin of this type of structure can be interpreted in terms of the isothermal transformation characteristics discussed in connection with Fig. 9.14 . The partly...