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Journal of Materials Science

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01-03-2008

Static fracture toughness of ultra-fine grained steels processed by thermo-mechanical warm rolling

Authors: Hai Qiu, Keitaro Enami, Kazuo Hiraoka, Kotobu Nagai, Yukito Hagihara

Published in: Journal of Materials Science | Issue 6/2008

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Abstract

Ultra-fine grained steels were recently developed by thermo-mechanical warm rolling. Their low-temperature fracture toughness was evaluated in terms of crack tip opening displacement (CTOD) in this paper. Effect of temperature on CTOD and the correlation between CTOD and grain size were investigated, and the experimental results showed that refining ferrite grains can increase the fracture toughness of steel and lower the sensitivity of fracture toughness to temperature. The fracture toughness of the developed ultra-fine grained steels was superior to that of hot-rolled steel SM490B with similar chemical composition.

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Ohmori A, Torizuka S, Nagai K (2001) CAMP-ISIJ 14:1050

Ohmori A (2004) Investigation on the creation of ultra-fine ferrite grain steel and the control of its mechanical properties. Ph.D. Thesis, Tokyo University

Qiu H, Kawaguchi Y (2003) Mater Sci Eng A 348:22CrossRef

Qiu H, Ohmori A, Hagiwara Y (2003) ISIJ Inter 43:2046CrossRef

Yoshinari H, Enami K, Koseki T, Shimanuki H, Aihara S (2001) J Soc Naval Arch Jpn 190:559CrossRef

Enami K (2002) Behavior of ductile and cleavage fracture initiation from compressively prestrained steel. Ph.D. Thesis, Tokyo University

ASTM E1290-99 (1999) Standard test method for crack-tip opening displacement (CTOD) fracture toughness measurement

WES 2805-1997 (1997) Method of assessment for flaws in fusion welded joints with respect to brittle fracture and fatigue crack growth. The Japan Welding Engineering Society

Hanamura T, Yin F, Nagai K (2004) ISIJ Inter 44:610CrossRef

Title: Static fracture toughness of ultra-fine grained steels processed by thermo-mechanical warm rolling
Authors: Hai Qiu
Keitaro Enami
Kazuo Hiraoka
Kotobu Nagai
Yukito Hagihara
Publication date: 01-03-2008
Publisher: Springer US
Published in: Journal of Materials Science / Issue 6/2008
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-007-2430-z

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