Effect of heating in hydrogen at high temperature on the embrittlement of welds
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The presence of more than 0.4% Mn and more than 3.0% Cr in Cr-Mo-W-V steel welds increases the tendency to temper brittleness and also additional hydrogen embrittlement during extended heating and high pressures in a hydrogen atmosphere.
Addition to the steel of elements forming stable carbides does not eliminate the adverse action of hydrogen on metal toughness. If, at high temperature and pressures, the steel deteriorates due to the effect of any mechanism, the hydrogen is apt to aggravate the situation.
The deterioration in toughness due to hydrogen must be associated not only with the possibility of iron carbide decomposition and the formation of methane but also with the hydrogen atoms diffused in the metal combining into molecules, this causing triaxial stresses in microregions and embrittlement of the material
KeywordsHydrogen Iron Atmosphere Methane Carbide
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