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The laser powder bed fusion (LPBF) was applied for near α (hcp)-Ti alloy (Ti-6Al-4Nb- 4Zr, mass%) and near β (bcc)-Ti alloy (Ti-6Al-2Sn-4Zr-6Mo) to investigate microstructure evolution depending on scanning conditions and creep deformation behavior related to micro-structure.
The melting pool boundaries that are formed by cyclic heating due to cyclic scanning of the laser beam were clearly observed in the as-built state in both alloys. The crystallographic orientation of the b phase was random in near α-Ti alloys, while columnar microstructures with crystallographic lamellar-like microstructure (CLM), a near single crystal-like micro-structure (SCM), and polycrystalline structures (PCM) were observed under the specific scan-ning condition in near β-Ti alloys.
The creep deformation mechanism is dislocation creep, which depends on the microstruc-ture in the molten pool rather than the grain size in both alloys. Even so, grain size depend-ence of creep life was observed in near α-Ti alloy. In near β-Ti alloy, there is no significant difference in creep deformation between SCM, CLM, and PCM. The creep strain was larger at low stress in the LPBFed samples compared with the forged sample, but the creep life was slightly longer in the LPBFed samples than in the forged sample.

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Keyword: Additive manufacturing, Crystallographic analysis, Heat-resistant titanium alloys, Microstructure, Precipitation, Volumetric energy density, Melting pool boundary

Conference: The 12th Pacific Rim International Conference on Advanced Materials and Processing (2026-08-09 - 2026-08-13)

Funding:

• JSPS JP21H05198 (Science for Super-Titanium Creation in Super Thermal Field)

Manuscript type: Not a journal article

MDR DOI: https://doi.org/10.48505/nims.6476

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Updated at: 2026-08-24 14:50:53 +0900

Published on MDR: 2026-08-24 16:27:36 +0900