Fig.1 Optical microstructure of both base metal and weld metal

Fig.2 Effect of temperature on tensile properties

Fig.3 Effect of temperature on absorbed energy

Fig. 4 Effect of temperature on fracture toughness

Fig. 5 Scanning electron microstructure of fracture surface after JIC test at 293K (crack orientation from left to right)

Fig. 6 Scanning electron microstructure of fracture surface after JIC test at 4K (crack orientation from left to right)