On the effect of building direction on the microstructure and grain morphology of a selective laser melted maraging stainless steel

Mehdi Sanjari, Amir Hadadzadeh, Ayda Shahriari, Saeed Tamimi, Hadi Pirgazi, Babak Shalchi Amirkhiz, Leo Kestens, Mohsen Mohammadi

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

Abstract

In this study, cylindrical rods of a low carbon Fe–Cr–Ni–Al maraging stainless steel (CX) were fabricated through selective laser melting (SLM) technique for both horizontal direction and cube samples with the dimensions of 15 × 15 × 15 mm. The microstructure and grain morphology of the as-built sample were studied using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). It was observed that in both cases the microstructure of the as-built sample consists of columnar dendrites aligned in the building direction because of the fast-directional cooling presents in the SLM process. However, the microstructural studies revealed that by changing the building method from cube to horizontal, both dendritic and grain structures have a tendency to change. Furthermore, the TEM results showed that different volume fractions of austenite and martensite phases were detected in both directions resulting from complex heat history and wide temperature range during the SLM process.

Original languageEnglish
Title of host publicationTMS 2020 149th Annual Meeting and Exhibition Supplemental Proceedings
EditorsZhiwei Peng, Jiann-Yang Hwang, Jerome Downey, Dean Gregurek, Baojun Zhao, Onuralp Yucel, Ender Keskinkilic, Tao Jiang, Jesse White, Morsi Mahmoud
Place of PublicationCham, Switzerland
PublisherSpringer
Pages285-295
Number of pages11
ISBN (Print)978-3-030-36295-9
DOIs
Publication statusPublished - 12 Feb 2020
EventTMS 2020 Annual Meeting & Exhibition - San Diego, United States
Duration: 23 Feb 202027 Feb 2020
https://www.tms.org/tms2020

Conference

ConferenceTMS 2020 Annual Meeting & Exhibition
Abbreviated titleTMS 2020
CountryUnited States
CitySan Diego
Period23/02/2027/02/20
Internet address

Keywords

  • additive manufacturing
  • direct metal laser sintering (DMLS)
  • electron backscattering diffraction (EBSD)
  • maraging stainless steel (CX)

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