High temperature behavior of Ni-base weld metal: Part I. Ductility and microstructural characterization

The ductility dip cracking resistance of two Ni-base Filler metals, Filler Metal 52 (FM-52) (59%Ni–29%Cr–9%Fe–1%Mn–1%Al) and Filler Metal 82 (FM-82) (72%Ni–20%Cr–1%Fe–3%Mn–3%Nb) was evaluated using the strain-to-fracture (STF) test. The reinterpretation of previously reported STF test results for these filler metals, is discussed, based on detailed microstructural characterization performed using electron microscopy. In Part II of this paper, new insight into the creep-like, grain boundary (GB) sliding mechanism responsible for intergranular cracking in these filler metals is presented.