Microstructure-Toughness Relationship in AISI4340 Steel

Abstract:

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To improve the strength and toughness of AISI 4340 steel, different microstructures, containing full bainite, bainite-ferrite, martensite-ferrite and full martensite were produced by different heat treatment cycles. Tensile, impact and hardness tests were carried out at room temperature. The ductile-brittle transition temperature was determined from impact data at different temperatures. The results showed that steel with bainite - 0.34 ferrite microstructure has the highest elongation and charpy impact energy, while its tensile strength and yield stress decreased in comparison to other microstructures. This increment was noticeable when bainite - 0.34 ferrite steel was tempered. The ductile-brittle transition temperature decreased with tempering of bainite -0.34 steel. The fracture surface analysis of charpy specimens also showed an increase in toughness of tempered bainite-ferrite in comparison to other microstructures.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 312-315)

Edited by:

Andreas Öchsner, Graeme E. Murch and João M.P.Q. Delgado

Pages:

110-115

DOI:

10.4028/www.scientific.net/DDF.312-315.110

Citation:

N. Saeidi and A. Ekrami, "Microstructure-Toughness Relationship in AISI4340 Steel", Defect and Diffusion Forum, Vols. 312-315, pp. 110-115, 2011

Online since:

April 2011

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$35.00

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