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Effect of partial austenitization on spheroidization of 1.4% C hypereutecto...

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in Spheroidization and Graphitization > Light Microscopy of Carbon Steels
Published: 01 August 1999
at 775 °C for 1 h, cooled at 100 °C/h. 195 HV. Picral. 1000×. (i) Variation with carbon content of the range of austenitizing temperatures from which spheroidal or partly spheroidal transformation products may form during slow cooling. Source: Rer 11. More
Book Chapter

Spheroidization and Graphitization

Available to Purchase

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560165
EISBN: 978-1-62708-291-4
..., cooled at 100 °C/h. 195 HV. Picral. 1000×. (i) Variation with carbon content of the range of austenitizing temperatures from which spheroidal or partly spheroidal transformation products may form during slow cooling. Source: Rer 11. Fig. 7.5 (Part 2) (e) Normalized, heated at 900 °C for 1 h...
Abstract
A spheroidized structure, which consists of spherically shaped cementite in a matrix of ferrite, is often desired in the production of steel, whether to improve properties, such as machinability and ductility, or accommodate subsequent hardening treatments. This chapter discusses the spheroidization of normalized and annealed steels by heating at subcritical temperatures. It explains how lamellar pearlite and proeutectoid cementite transform when heated and how deformation prior to heating affects both the mechanism and kinetics of spheroidization. It also explains how austenitizing contributes to the production of spheroidal transformation products and why secondary graphitization sometimes occurs.
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