Abstract
The microstructure evolution of laser powder bed fusion processed Inconel 625 after heat treatment at 650 ℃ (aging), 850 ℃ (sensitization) and 1050 ℃ (homogenization) was studied. Relationship of microstructure evolution and the anisotropic mechanical properties and corrosion resistance was analyzed. Decreased corrosion resistance after aging and sensitization was observed, which is related to the different precipitation behavior. After aging, γ″ and MC carbides precipitated along cellular structures further accelerate the corrosion along melting pool boundaries. While after sensitization, δ precipitated along cellular structures aggravated the corrosion along the melting pool boundaries. At the meantime, precipitation of M23C6 carbides and δ along grain boundaries made it vulnerable to be corroded, which further accelerate the corrosion rate. After homogenization, segregation and precipitates are barely observed in the microstructure which contribute to an enhancement of corrosion resistance. Moreover, with the increasing of heat treatment temperature, recovery of anisotropic microstructure contributes to the decrease of the anisotropy of mechanical properties. This study may contribute to the profound comprehension of heat treatment procedure on microstructure evolution as well as mechanical properties and corrosion resistance of laser powder bed fusion processed Inconel 625.
Published Version
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