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Effect of heat treatment on microstructure and corrosion properties of double-wire GTA additive manufactured 308L stainless steel.
- Source :
-
Materials Letters . Feb2022, Vol. 309, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- • Crucial heat treatment is employed to SS308L manufactured by DW-GTA-AM. • δ ferrite is fewer in heat-treated SS308L than in as-deposited SS308L. • Corrosion resistance of SS308L increases along with the heat-treated temperature. Heat treatment is a critical approach to improve the microstructure and properties of SS308L fabricated in double wire gas tungsten arc additive manufacturing (DW-GTA-AM). The influence of heat treatment on the microstructure and corrosion properties of SS308L was studied. The microstructures of the samples heat treated at 1000, 1050 and, 1100 ℃ for one hour consist of δ ferrite and austenite, and δ ferrite spheroidizes gradually. Compared with the as-deposited sample, the amount of δ ferrite is negatively correlated with the heat-treated temperature. Potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) measurements indicate that the corrosion resistance increases along with the heat-treated temperature, which can be attributed to that a higher heat-treated temperature results in a thicker and more compact passive film, dissolution of more δ ferrite, and better element diffusion. The corrosion resistance of SS308L is mainly affected by the secondary phase and element distribution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0167577X
- Volume :
- 309
- Database :
- Academic Search Index
- Journal :
- Materials Letters
- Publication Type :
- Academic Journal
- Accession number :
- 154242097
- Full Text :
- https://doi.org/10.1016/j.matlet.2021.131362