Abstract
Small addition of titanium and boron to welding consumables improves drastically the toughness of welded structures. To investigate the behaviour of titanium and boron on an atomic scale, an atom probe field-ion microscopic study was undertaken on two grades of welds; one with only titanium and one with titanium and boron. It was observed that boron forms pairs with carbon and small clusters with oxygen and carbon. The “bulk” composition in weight per cent was calculated for about 20 000 ions and showed considerable difference from the results obtained from other analytical techniques.
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