Abstract
In-situ heat treatment (IHT) was introduced in wire arc additive manufacturing (WAAM) process to fabricated Inconel625-high strength low alloy (HSLA) steel functionally graded material (FGM). The graded region with severe Laves phases precipitation was heat treated in 1080℃/1h and 1080℃/2h to alleviate the Laves phases adverse effects. Scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and transmission electron microscope (TEM) were applied to analyze the microstructures of the FGMs. By using IHT, the Laves phases were dissolved, Nb-rich carbides packed with dislocation tangles and stacking faults generated, and the tensile strength along the building direction of the Inconel625-HSLA steel FGM has been improved from 512 ± 15 MPa to 602 ± 10 MPa.
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