Microstructural evolution and mechanical properties of maraging steel produced by wire + arc additive manufacture process
- Welding Engineering and Laser Processing Centre, Cranfield University, Bedford MK43 0AL (United Kingdom)
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094 (China)
Highlights: • Wire + arc additive manufacture (WAAM) was applied to produce maraging steel structures. • Microstructure evolution of WAAM alloy was characterized and correlated with the layer-by-layer building manner. • Mechanical properties of WAAM alloy were tested and correlated with the aging response of WAAM microstructure. • Retained austenite content was measured and correlated with the tensile strength loss. - Abstract: Wire + arc additive manufacture is developed for producing large-scale metallic components. In this paper, maraging steel parts were produced, and the microstructure and mechanical properties were investigated. The microhardness and tensile strength of the as deposited alloy reduced from the bottom to the top due to the transient thermal cycling, which resulted in partial aging and non-uniform formation of intermetallic compounds along the building direction. Solutionizing, followed by 3 h aging, significantly reduced the microstructural heterogeneity and increased the mechanical properties by 24.7% through the formation of large amounts of finely distributed precipitates. The as deposited alloy possessed superior strength to the wrought alloy in solutionized condition but inferior to the later in aged condition, which was attributed to the less pronounced aging response of the low-angle columnar grains characterized microstructure and the presence of retained and reverted austenite.
- OSTI ID:
- 22805751
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 143; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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