1. National Defense Key Laboratory for Remanufacturing Technology, Academy of Armored Force Engineering,Beijing 100072, China 2. College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060,Guangdong, China 3. College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
Abstract：Inconel 718 superalloy component was successfully fabricated by plasma arc additive manufacturing and heat treated in the standard method. The influences of heat treatment on the microstructure and mechanical property of as- fabricated sample were investigated by means of optical microscope, scanning electron microscope, energy spectrum analysis, transmission electron microscopy, microhardness characterization and so on. The results showed that the microstructure of as- fabricated sample exhibits columnar dendrites growing along building direction. A number of Laves phases and a few MC particles are precipitated in the interdendritic region. After standard heat treatment, many Laves phases are dissolved resulting in the precipitation of γ″ hardening phases and the microhardness is improved remarkably.
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2018, Vol. 25 
