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<p>Titanium alloys are widely employed in high-performance applications such as aerospace components and medical implants. Thereby, advances in additive manufacturing (AM) have promoted the use of AM-produced Ti-based parts, which offer new possibilities for lightweight structures and functional integration. However, the microstructural, mechanical, and thermal properties of AM-processed metals often differ significantly from those of conventionally manufactured parts, posing challenges for post surface processing. Although AM parts are usually produced near-net-shape, post-processing by machining is often required to meet surface quality and dimensional specifications. Due to its thermomechanical properties, titanium is generally considered a difficult-to-machine material. While the machinability of conventionally cast and wrought titanium alloys has been extensively studied, comparatively little research focused on AM counterparts. In this study, the machinability of the alloy Ti-5Al-5V-5Mo-3Cr (Ti-5553) produced by laser powder bed fusion (PBF-LB/M) is investigated, emphasizing on chip formation and tool wear. Additively manufactured samples were compared to conventionally forged material, both subjected to two common heat treatments. The results show that the advantageous service life behavior observed for the additively manufactured samples is mostly retained after heat treatment compared to conventionally machined Ti-5553.</p>

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Impact of microstructure and heat treatment on chip formation of Ti-5553 processed by laser powder bed fusion

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月7日

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  • Berend Denkena,
  • Julia K. Hufenbach,
  • Benjamin Bergmann,
  • Uta Kühn,
  • Victoria Kaban,
  • Jan Schenzel,
  • Sebastian Worpenberg,
  • Clemens Kunz

摘要

Titanium alloys are widely employed in high-performance applications such as aerospace components and medical implants. Thereby, advances in additive manufacturing (AM) have promoted the use of AM-produced Ti-based parts, which offer new possibilities for lightweight structures and functional integration. However, the microstructural, mechanical, and thermal properties of AM-processed metals often differ significantly from those of conventionally manufactured parts, posing challenges for post surface processing. Although AM parts are usually produced near-net-shape, post-processing by machining is often required to meet surface quality and dimensional specifications. Due to its thermomechanical properties, titanium is generally considered a difficult-to-machine material. While the machinability of conventionally cast and wrought titanium alloys has been extensively studied, comparatively little research focused on AM counterparts. In this study, the machinability of the alloy Ti-5Al-5V-5Mo-3Cr (Ti-5553) produced by laser powder bed fusion (PBF-LB/M) is investigated, emphasizing on chip formation and tool wear. Additively manufactured samples were compared to conventionally forged material, both subjected to two common heat treatments. The results show that the advantageous service life behavior observed for the additively manufactured samples is mostly retained after heat treatment compared to conventionally machined Ti-5553.