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<p>This research investigates the effect of process parameters, orientation, and heat treatment on the microstructure and mechanical properties of laser powder bed fusion (LPBF)-processed Inconel alloy IN718. The study show that the process parameters such as Laser power – LP(W), scanning speed – SS(mm/s), hatch spacing – HS(mm), powder bed thickness – PBT(mm), orientation and heat treatment significantly influence the microstructure, and mechanical properties – viz., elongation (%el), yield strength (YS), ultimate tensile strength (UTS) of the IN 718 alloy. The study identifies optimal process parameters using a modified Taguchi method and validates statistical consistency of repeated test data using Chauvenet’s criterion. The optimal process parameters—laser power of 360&#xa0;W and scanning speed of 960&#xa0;mm/s—yielded enhanced mechanical properties in both as-printed (AP) and solution-treated and age-hardened (STA) conditions. The achieved mechanical properties in the as printed (AP): YS = 774 ± 96&#xa0;MPa, UTS = 1140 ± 81, %el = 31 ± 10% and after solution treatment followed by age hardening (STA) properties improved to are: YS = 1286 ± 129&#xa0;MPa, UTS = 1516 ± 130&#xa0;MPa, %el = 21 ± 4%. These results demonstrate that LPBF-processed IN718 components can achieve superior mechanical performance compared to conventionally processed counterparts, making them highly suitable for aerospace and automotive applications.</p>

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Mechanical Properties of Laser Powder Bed Fusion Processed IN718: Taguchi Optimisation and Analysis of Experimental Results

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Kurre Prasanth Kumar Reddy,
  • Boggarapu Nageswara Rao,
  • Kartikey Sharma,
  • Ravi Ranjan Kumar,
  • S. V. S. Narayana Murty

摘要

This research investigates the effect of process parameters, orientation, and heat treatment on the microstructure and mechanical properties of laser powder bed fusion (LPBF)-processed Inconel alloy IN718. The study show that the process parameters such as Laser power – LP(W), scanning speed – SS(mm/s), hatch spacing – HS(mm), powder bed thickness – PBT(mm), orientation and heat treatment significantly influence the microstructure, and mechanical properties – viz., elongation (%el), yield strength (YS), ultimate tensile strength (UTS) of the IN 718 alloy. The study identifies optimal process parameters using a modified Taguchi method and validates statistical consistency of repeated test data using Chauvenet’s criterion. The optimal process parameters—laser power of 360 W and scanning speed of 960 mm/s—yielded enhanced mechanical properties in both as-printed (AP) and solution-treated and age-hardened (STA) conditions. The achieved mechanical properties in the as printed (AP): YS = 774 ± 96 MPa, UTS = 1140 ± 81, %el = 31 ± 10% and after solution treatment followed by age hardening (STA) properties improved to are: YS = 1286 ± 129 MPa, UTS = 1516 ± 130 MPa, %el = 21 ± 4%. These results demonstrate that LPBF-processed IN718 components can achieve superior mechanical performance compared to conventionally processed counterparts, making them highly suitable for aerospace and automotive applications.