Abstract
We employed two additive manufacturing (AM) strategies perpendicular to each other in AM stainless steel. In contrast to the vertically-built strategy, the horizontally-built one imposed higher tensile strength and ductility due to distinct transformation-induced plasticity (TRIP) behavior and a tailored initial texture oriented more favorably for deformation texture. We applied the direct-aging-treatment without solid-solution to retain unique AM microstructure and retained austenite (RA), which enhanced yield strength (+ 60.2%), tensile strength (+ 41.2%), and ductility (+ 81.2%). This effective strengthening by the direct-aging-treatment effectively increased the stability of RA delaying the onset of TRIP. This is because RA grains possessed relatively homogeneous chemical composition by aging and are effectively suppressed by a harder neighbored precipitated-martensitic matrix despite the increase of stacking fault probability. Our findings offer a promising paradigm for tailoring properties of texture-controlled AM steels with the aging strategy and advance a fundamental understanding of the intrinsic deformation behavior of AM metals. Graphic Abstract: (Figure presented.).
Original language | English |
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Pages (from-to) | 1321-1330 |
Number of pages | 10 |
Journal | Metals and Materials International |
Volume | 30 |
Issue number | 5 |
DOIs | |
State | Published - May 2024 |
Keywords
- Additive manufacturing
- Aging-treatment
- Mechanical stability
- Steel
- Transformation-induced plasticity