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Microstructure-Toughness Relationship in AISI4340 Steel

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Abstract:

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.

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Periodical:

Defect and Diffusion Forum (Volumes 312-315)

Pages:

110-115

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.312-315.110

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Online since:

April 2011

Authors:

N. Saeidi, A. Ekrami

Keywords:

Bainite, Ferrite, Impact Energy, Martensite, Microstructure, Tensile Strength, Toughness

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] J. M. Tartaglia, K. A. Lazzari, G. P. Hui, and K. L. Hayrynen: Met. and Mat. Trans. A Vol. 39A (2008), p.559.

Google Scholar

[2] M. R. Akbarpour and A. Ekrami: Materials Science and Engineering A Vol. 477 (2008), p.306.

Google Scholar

[3] Y. Tomita and K. Okabayashi: Metallurgical Transactions Vol. 14A (1983), p.485.

Google Scholar

[4] Y. Tomita: Metallurgical Transactions Vol. 18A (1987), p.1495.

Google Scholar

[5] A. Ekrami, Unpublished Work.

Google Scholar

[6] R. Bakhtiari and A. Ekrami: Defect and Diffusion Forum Vol. 297 (2010), p.62.

Google Scholar

[7] C. Garcia-Mateo and F.G. Caballero: ISIJ International Vol. 45 (2005), p.1736.

Google Scholar

[8] H. K. D. H. Bhadeshia: Bainite in Steels, Second Edition, (2001).

Google Scholar

[9] R. W. Hertzberg: Deformation and fracture mechanics of engineering materials, 4th Ed, Wiley, USA, (1996).

Google Scholar

[10] Annual book of ASTM Standards, A370 (2001).

Google Scholar

[11] Annual book of ASTM Standards, E23 (2001).

Google Scholar