Mechanical Stability of Retained Austenite and Texture Evolution in Additively Manufactured Stainless Steel

Hobyung Chae, E. Wen Huang*, Jayant Jain, Dong Hyun Lee, Stefanus Harjo, Takuro Kawasaki, Soo Yeol Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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 languageEnglish
Pages (from-to)1321-1330
Number of pages10
JournalMetals and Materials International
Volume30
Issue number5
DOIs
StatePublished - May 2024

Keywords

  • Additive manufacturing
  • Aging-treatment
  • Mechanical stability
  • Steel
  • Transformation-induced plasticity

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