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The microstructure, hardness, precipitates and phase transformation are studied before and after a process of 1050°C solid solution + double ageing for Inconel 718 alloys fabricated by SLM. The test results show that the obvious weld beads structure can be observed on unheated surface of alloys. The microstructure shows seriously inhomogeneous with distributing columnar crystals and fine dendrites...
The effect of treatment in weld surface on four-point bend fatigue properties and fracture characteristic of Ti–6.5Al–2Zr–1Mo–1V alloy by vacuum electron beam welding were tested and analyzed. When the excess weld metal and excess penetration are removed, the high fatigue strength of joints can be obtained. When the excess weld metal and excess penetration were not removed, the fatigue strength of...
The refractory alloy 50Mo–50Re thin sheet was welded successfully by small-scale laser lap welding. There were obvious gas pores and cracks near the interface of the laser lap-welded joint. The hardness (HV420) near the interface zone of laser lap-welded joint was obviously higher than that in the heat-affected zone (HV370) and base metal (HV290). The fracture morphology near the interface zone shows...
Thermal analysis and phase transformation of aluminium matrix surface composite adding Al-based amorphous fabricated by FSP was studied. The test result indicated that the surface composite mainly is composed of a large number of nano structures. AlCuMg precipitated phases and incomplete crystallization amorphous phases form the in a nano-structure matrix. The exothermic area of base metal is bigger...
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