Fig. 1. Schematic of test device

Fig. 2. Drawings of tensile specimens. (a) Room-temperature tensile specimen; (b) high-temperature (900 ℃) tensile specimen; (c) creep tensile specimen

Fig. 3. Temperature rise curve of tensile specimens during vacuum heat treatment

Fig. 4. Typical microstructures of GH3128 lap welds under different numbers of heat treatment cycles

Fig. 5. Microhardness test locations

Fig. 6. Microhardness distributions of lap joints under different numbers of heat treatment cycles. (a)At center of weld; (b)at upper plate; (c)at under plate

Fig. 7. Tensile properties of GH3128 lap joints under different heat treatment conditions

Fig. 8. Different tensile fracture specimens. (a) Room-temperature tensile specimens; (b) 900 ℃ tensile specimens

Fig. 9. Tensile fracture morphologies

Fig. 10. Creep curves of GH3128 lap joint at 900 ℃

Fig. 11. Detecting positions on joint surface by SEM

Fig. 12. SEM images of weld microstructure at joint surface