β Scribed by Prof. Dr. L. Vehovar
No coin nor oath required. For personal study only.
The effect of Cr, Mo, V, Nb, Mn, their carbides and different microstructures on the corrosion and hydrogen uptake of two fineβgrained microalloyed steel grades has been investigated. In practice, fineβgrained structural steels appear to be more or less susceptible to hydrogen induced cracking, probably because of various strong interactions between the absorbed hydrogen and the various alloying elements or their carbides, acting as traps. The effect of microstructure was examined by cathodic polarization, by measuring the reduction of area, and by SEM examination of the fracture surface. In addition, hydrogen permeation transients for one microalloyed steel grade and Armco iron were measured, and the resistance of both steel grades to sulphide stressβcracking according to the NACE Standard TMβ01β77 was also determined.
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The susceptibility to hydrogen of a X80 grade steel produced by a thermo-mechanical control process (TMCP) has been investigated by keeping straining notched specimens under continuous charging conditions. Hydrogen charging was carried out either in synthetic seawater under potentiostatic control at
## Abstract Hydrogen absorption, mechanical testing under different loading mode and electrochemical measurement were done for 0.3C low alloy steels used in the ship engine parts at immersion in the boiler fuel and in the used engine mineral oil at elevated temperatures corresponding to the operati