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<p>The current work focuses on phase transformation pathways and the correlation between microstructure and mechanical properties of heat-treated direct metal laser sintered additively manufactured Ti6Al4V alloy. As-printed sample consists of acicular <i>α</i>′ with heterogeneously distributed nano <i>β</i> particles. However, after heat treatment, heterogeneity of the <i>β</i> phase was reduced and morphology of the <i>β</i> phase was modified to rod shape. Mechanical properties are influenced by <i>α</i>/<i>α</i>′ lath size and extent of decomposition of acicular <i>α</i>′ → <i>α</i> + <i>β</i>. Moreover, high fraction of <i>β</i> phase and presence of both particle and rod shape <i>β</i> counteracts the effect of larger <i>α</i>′/<i>α</i> lath thickness on decreasing ductility. The best combination of tensile strength (1193 ± 5&#xa0;MPa) and ductility (17.1 ± 0.45&#xa0;pct) was achieved through the phase transformation pathway; (<i>α</i>′ + non-uniformly distributed nano <i>β</i> particles) → (<i>β</i> + primary <i>α</i>) → (primary <i>α</i> + <i> α</i>′ + few nano <i>β</i> particles) → (primary <i>α</i> + <i>α</i>/<i>α</i>′ + uniformly distributed nano <i>β</i> particles).</p>

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Phase Transformation Pathways and Mechanical Behavior of Heat-Treated Direct Metal Laser Sintered Additively Manufactured Ti6Al4V Alloy

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Bishnu Prasad Mahto,
  • Abhishek Tripathi,
  • A. G. Rao,
  • Rajiv Kumar,
  • R. K. Rai,
  • M. K. Mishra

摘要

The current work focuses on phase transformation pathways and the correlation between microstructure and mechanical properties of heat-treated direct metal laser sintered additively manufactured Ti6Al4V alloy. As-printed sample consists of acicular α′ with heterogeneously distributed nano β particles. However, after heat treatment, heterogeneity of the β phase was reduced and morphology of the β phase was modified to rod shape. Mechanical properties are influenced by α/α′ lath size and extent of decomposition of acicular α′ → α + β. Moreover, high fraction of β phase and presence of both particle and rod shape β counteracts the effect of larger α′/α lath thickness on decreasing ductility. The best combination of tensile strength (1193 ± 5 MPa) and ductility (17.1 ± 0.45 pct) was achieved through the phase transformation pathway; (α′ + non-uniformly distributed nano β particles) → (β + primary α) → (primary α +  α′ + few nano β particles) → (primary α + α/α′ + uniformly distributed nano β particles).