Work

Characterizations of the anisotropic features of the phase, texture and deformation behavior of laser powder bed fusion-processed H13 steel

Year: 2025

Type: article

Abstract: H13 steel with a relative density of approximately 99.9 % was fabricated by LPBF with 200 °C preheating (H13−200). Samples were built along horizontal (0°, H13 200H) and vertical (90°, H13–200 V) orientations relative to the build platform to investigate the anisotropy of microstructural features and mechanical properties. Despite similar grain morphology, size, and crystallographic texture, the retained austenite (RA) content varied between orientations. H13–200 V exhibited higher RA fractions due to enhanced intrinsic tempering. Compared to previously reported H13 steel processed with similar or no preheating, H13–200 demonstrated higher tensile strength and elongation, with no notable tensile anisotropy observed. The deformation and damage evolution mechanisms were analyzed. Strain hardening and ductility were promoted by the formation of a fine cellular substructure and the transformation-induced plasticity effect from RA. Fractographic and microstructural analyses revealed that RA suppressed crack propagation and contributed to damage tolerance. These results demonstrate that moderate preheating can effectively tailor the phase composition and enhance mechanical performance without introducing notable anisotropy in LPBF H13 steel.

Source: Materials Characterization

DOI: 10.1016/j.matchar.2025.115403

Authors: Huajing Zong, Nan Kang, Mohamed El Mansori

Institutions: Arts et Métiers, HESAM Université, Laboratoire de Mécanique et Procédés de Fabrication

Language: English

Topic: Additive Manufacturing Materials and Processes

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,320

Funder: China Scholarship Council