THE STUDY OF FRACTURE TOUGHNESS OF HEAT-AFFECTED ZONE OF WELDED JOINTS OF STEELS APPLIED FOR ARCTIC STRUCTURES


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Abstract

The tests to estimate the CTOD (crack tip opening displacement) fracture toughness parameter for the metal of heat-affected zone (HAZ) of welded joints at the minimum operating temperatures (−30...−50 °С) are the mandatory element of the Programs of tests conducted under the supervision of the Russian Maritime Register of Shipping (RМRS) to get the approval for the metallurgical production of heavy gauge rolled steel intended for manufacturing the Arctic shelf marine facilities and ice-going vessels. 

The paper studies fracture toughness of heat-affected zones of welded joints of high-resistance shipbuilding steels applied when producing arctic structures. Current experience of such testing revealed a number of both the procedural and criterial issues. In particular, it is practically impossible to carry out HAZ tests without partial penetration of the fatigue crack front to the weld with the low fracture toughness due to the curvature of weld joint fusion line. The statistically representative volume of data on the fracture toughness of welded joints of high-resistance shipbuilding steels was collected.

The authors carried out the metallographic analysis of samples, which detected the actual penetration of the initial fatigue crack tip to the welded joint zone. Based on the data obtained, the authors carried out the analysis of the significance of some factors influencing the result obtained and the predictability of actual fracture toughness of local embrittled zones.

The algorithm of indirect evaluation of “actual” fracture toughness of the coarse grain HAZ metal based on the testing results of specimens made of weld metal, base metal and the statistically representative number of specimens notched along the HAZ is proposed in this paper. It is determined that the “actual” fracture toughness of HAZ is sufficiently lower than the one obtained when testing according to the standard methods.

About the authors

A. Yu. Markadeeva

I.V. Gorynin Central Research Institute of Structural Materials Prometey of National Research Center Kurchatov Institute

Author for correspondence.
Email: npk3@crism.ru

postgraduate student, engineer

Russian Federation

A. V. Ilyin

I.V. Gorynin Central Research Institute of Structural Materials Prometey of National Research Center Kurchatov Institute

Email: npk3@crism.ru

Doctor of Sciences (Engineering), associate professor, Deputy Director

Russian Federation

M. A. Gusev

I.V. Gorynin Central Research Institute of Structural Materials Prometey of National Research Center Kurchatov Institute

Email: npk3@crism.ru

principal engineer

Russian Federation

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