Article, 2023

Anisotropic response of additively manufactured 316 L stainless steel towards low-temperature gaseous carburization

Surface and Coatings Technology, ISSN 1879-3347, 0257-8972, Volume 470, Page 129874, 10.1016/j.surfcoat.2023.129874

Contributors

Feng, Yajian [1] Duan, Han [1] Zhao, Zhenxu [1] Liu, Zhe [2] Peng, Ya Wei 0000-0002-5631-5269 (Corresponding author) [1] Gong, Jian Ming (Corresponding author) [1] Somers, Marcel A.J. [3]

Affiliations

  1. [1] Nanjing Tech University
    2. [NORA names: China; Asia, East];
  2. [2] Qingdao University of Technology
    3. [NORA names: China; Asia, East];
  3. [3] Technical University of Denmark
    4. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD]

Abstract

In order to modify the surface properties of austenitic stainless steel fabricated by Laser Powder Bed Fusion (L-PBF), low-temperature gaseous carburization (LTGC) was employed. During LTGC, a carburized case of expanded austenite forms at the surface, which contains a high surface carbon content (∼2.5 wt%), high nano-hardness (∼12.6 GPa), large compressive residual stresses (from −2.4 GPa to −3.2 GPa), and is free of carbide precipitates. In the expanded austenite zones, different residual stresses were measured with X-ray diffractometry (XRD) for the top plane, i.e. in the plane perpendicular to the build direction, and for the side plane. This anisotropy is suggested to be caused by grain-shape anisotropy for the different specimen planes and inherent to the hierarchical microstructures resulting from L-PBF.

Keywords

L-PBF, X-ray, X-ray diffractometry, anisotropic response, anisotropy, austenite forms, austenite zone, austenitic stainless steel, bed fusion, carbide precipitation, carbon content, carburization, carburized case, cases, compressive residual stress, content, diffractometry, direction, form, fusion, gaseous carburization, hierarchical microstructure, higher nano-hardness, i., laser, laser powder bed fusion, low-temperature gaseous carburization, microstructure, nano-hardness, perpendicular, plane, plane perpendicular, powder bed fusion, precipitation, properties of austenitic stainless steel, residual stress, response, side, side planes, specimen plane, specimens, stainless steel, steel, stress, surface, surface carbon content, surface properties, surface properties of austenitic stainless steels, top plane, zone

Funders

  • National Natural Science Foundation of China

Data Provider: Digital Science

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