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Abstract

Compact tension geometry specimens machined from C–Mn submerged arc weld metal have been examined after fracture at about −70°C. Analyses by scanning electron microscope operating at 15 KeV show that within the grain refined regions of the weld metal there is a small proportion of intergranular fracture (≤1%) within the cleavage fracture. Examination of grain boundaries by microanalysis reveals that P has segregated to these regions as a result of the welding and post-weld heat treatment cycles. The amount of P segregation has been quantified on fracture surfaces in a scanning Auger spectrometer, and by high resolution X -ray microanalysis on thin foil specimens using afield emission gun scanning transmission electron microscope fitted with an energy dispersive spectrometer. The proportion of intergranular fracture is discussed with respect to the grain geometry and the segregation of P.

MST/2089

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Low temperature fracture of C–Mn sublllerged arc weld metal

Abstract

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