MICROSTRUCTURAL FEATURES OF FATIGUE DAMAGEABILITY AND METHODS TO IMPROVE THE FATIGUE LIFE OF WELDED JOINTS FROM 09G2S STEEL

摘要

The paper presents the results of investigation of the effect of cyclic bend loading on brittle fracture resistance of the HAZ metal, as well as accumulation of fatigue damages and structural changes in butt and T-welded joints in 09G2S steel. It is shown that presence of a sharp stress raiser at low temperatures (-40℃ and lower) leads to lowering of brittle fracture resistance of HAZ metal of welded joints with fatigue damages.