Mechanical Properties of Ti-B Containing Weld Metals

Abstract

The effect of weld metal chemistry on the microstructures and mechanical properties of submerged arc welds has been studied. It was found that additions of Ti promote the formation of acicular ferrite to greater extent as compared with additions of other elements such as Mn and Mo, improve Charpy and COD properties of as-welded deposits and offer welds with quite homogeneous properties both in as-welded and reheated region.
Correlations were found among 0.25 mm COD transition temperatures Ti_0.25, Charpy transition temperatures vTrs and tensile strengths σ_B provided that these test specimens were sampled from the same area and are eiven as follows:
[T_0.25]as-weld=0.84vTrs+4.3σ_B-286, [T_0.25]regeated=0.72vTrs+2.6σ_B-176
It was also found that N deteriorates Charpy and COD properties significantly and the deposits contained Ti-B provide a good tolerance to it. Among the deposits bearing Ti, the consumable types likely to give the best combinations of tensile strengths in the range 50-60 kg/mm², Charpy and COD properties were proved to be those containing Ti-B.