Research and Development > JFE TECHNICAL REPORT >JFE TECHNICAL REPORT No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining” > Effect of Toughness Distribution in the Thickness Direction on Brittle Crack Propagation/Arrest Behavior of Heavy-gauge Steel Plate

No.20 March 2015 - Special Issue on “Steel Plates” and “Welding and Joining”

Effect of Toughness Distribution in the Thickness Direction on Brittle Crack Propagation/Arrest Behavior of Heavy-gauge Steel Plate

HANDA Tsunehisa      NISHIMURA Kimihiro     TSUYAMA Seishi

Abstract

Brittle crack arrestability of heavy steel plates with different toughness distribution in the plate thickness direction was investigated to clarify the optimum distribution of properties in the thickness direction, which is necessary in the development of heavy steel plates with excellent brittle crack arrest performance. Ultra-wide duplex ESSO tests were performed, and the effect of the toughness distribution in the thickness direction on the arrestability of long brittle cracks was studied. Even in plates having the same brittle crack arrest toughness value, plates in which the toughness at the middle thickness position (1/2 t) is higher than that at the 1/4 t and surface layer positions displayed higher brittle crack arrestability under no temperature gradient condition which simulates actually applications, than plates in which the 1/2 t toughness is lower than that at the 1/4 t and surface positions. Furthermore, it is shown that this superiority is maintained even in the case of long brittle cracks.

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