Dissolution of Cementite in Carbon Steels by Heavy Deformation and Laser Heat Treatment

Abstract:

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Dissolution behavior of cementite in eutectoid steels with pearlitic and spheroidite structures by severe plastic deformation was studied. Applying a long time milling, cementite dissolved completely and matrix turned out to be nanocrystalline ferrite. By a ball drop deformation (at high strain rates), heavily deformed layers in which cementite dissolves completely or partially were produced. By applying pulsed laser irradiation, re-austenitized zone which transformed to fresh martensite during quenching was produced. The boundary between the re-austenitized zone and matrix exhibited similar microstructure with that observed in specimens subjected to a ball drop deformation. It was suggested that the dissolution of cementite by heavy deformation at high strain rates are probably due to thermal effect, that is, re-austenitization.

Info:

Periodical:

Materials Science Forum (Volumes 503-504)

Edited by:

Zenji Horita

Pages:

461-468

DOI:

10.4028/www.scientific.net/MSF.503-504.461

Citation:

M. Umemoto et al., "Dissolution of Cementite in Carbon Steels by Heavy Deformation and Laser Heat Treatment", Materials Science Forum, Vols. 503-504, pp. 461-468, 2006

Online since:

January 2006

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Price:

$35.00

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