Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Tensile and Fracture Behaviour of 500 MN/m2 Grade High Tensile Steel under Cathodic Protection by Slow Strain Rate Technique
Keishi NAKANOMasao KANAOTakao AOKI
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1985 Volume 71 Issue 2 Pages 258-265

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Abstract

Slow strain rate tensile tests were carried out on specimens of a high tensile structural steel( JIS SM50B) in 3.5 %NaCl solution as a function of strain rate under freely corroding and cathodically polarized conditions. The main rasults obtained are as follows;
(1) A tendency of decrease in ductility was notable at potentials less than -850mV(SCE) with strain rates less than 7×10-5 s-1. This decrease in ductility was attributed to cathodically charged hydrogen induced cracking.
(2) The hydrogen induced cracking resulted in formation of transgranular cracks and their crystallographic planes were found not to be cleavage but mainly parallel to {110} slip planes.
(3) The hydrogen induced cracking was not observed under constant load condition in the range of cathodic potential studied, so it was suggested that the continuous plastic deformation played an important role for the hydrogen induced cracking to occur.

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© The Iron and Steel Institute of Japan
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