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<p>The thermal history during laser powder bed fusion (LPBF) processing is significantly influenced by variations in laser power and scanning speed, which can be optimised to improve the microstructure and mechanical properties of the fabricated components. Herein, we systematically examined the impact of laser power and scanning speed on the mechanical properties, wear performance, and magnetic susceptibility of a Ti35Nb15Zr (at%) alloy. The present findings reveal that increasing both the laser power and scanning speed leads to a more uniform distribution of coarse and fine grains within the alloy, an increase in the yield strength from 1241.46 to 1258.19&#xa0;MPa, and an increase in the elongation from 6.81 to 7.87%. At a fixed scanning speed, augmenting the laser power results in an increase in the average grain size from 15.92&#xa0;μm to 19.63&#xa0;μm and a decrease in the content of unfused Nb from 0.63 to 0.154%, which results in an increase in the elongation of the samples from 6.81 to 8.36%, and an increase in the wear resistance by 28.96%. The presence of lack of fusion in the T3515 alloy leads to a decrease in the ductility, and additionally the elevated heat input strengthens the alignment of the &lt; 001 &gt; crystallographic texture, which increases the magnetic susceptibility of the alloy.</p> Graphical Abstract <p></p>

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Microstructure, Mechanical Properties, Wear Performance and Magnetic Susceptibility of Ti-35Nb-15Zr (at%) Alloy Fabricated by Laser Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Jun Zhou,
  • Pengcheng Lv,
  • Buwei Xiao,
  • Yurong Wang,
  • Ting Long,
  • Xiaoyu Liang,
  • Yu Long,
  • Huidong Hou

摘要

The thermal history during laser powder bed fusion (LPBF) processing is significantly influenced by variations in laser power and scanning speed, which can be optimised to improve the microstructure and mechanical properties of the fabricated components. Herein, we systematically examined the impact of laser power and scanning speed on the mechanical properties, wear performance, and magnetic susceptibility of a Ti35Nb15Zr (at%) alloy. The present findings reveal that increasing both the laser power and scanning speed leads to a more uniform distribution of coarse and fine grains within the alloy, an increase in the yield strength from 1241.46 to 1258.19 MPa, and an increase in the elongation from 6.81 to 7.87%. At a fixed scanning speed, augmenting the laser power results in an increase in the average grain size from 15.92 μm to 19.63 μm and a decrease in the content of unfused Nb from 0.63 to 0.154%, which results in an increase in the elongation of the samples from 6.81 to 8.36%, and an increase in the wear resistance by 28.96%. The presence of lack of fusion in the T3515 alloy leads to a decrease in the ductility, and additionally the elevated heat input strengthens the alignment of the < 001 > crystallographic texture, which increases the magnetic susceptibility of the alloy.

Graphical Abstract