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<p>The Additive Manufacturing (AM) ability of AD730<sup>®</sup> alloy by powder bed fusion laser beam (PBF-LB) is investigated for comparison with the cast &amp; wrought AD730<sup>®</sup> alloy developed by Aubert &amp; Duval for gas turbine applications. Several designs of experiments were needed to identify stable manufacturing conditions and build-up strategy in terms of low defect rate and microstructure soundness. The PBF-LB AD730<sup>®</sup> alloy exhibits columnar grains along the build direction. The resultant texture is close to a single-crystalline-like cube texture. Upon annealing, such a strong texture is preserved despite forming a network of fine transgranular secondary <i>γ</i>’ precipitates. Room-temperature tensile properties are encouraging, with yield stress between the coarse and fine-grain microstructures of cast &amp; wrought AD730<sup>®</sup> for both orientations. No evidence of premature failure due to microcracks has been detected in the overall test specimens. Finally, room-temperature self-heating fatigue tests were conducted on specimens using cyclic loading. The resistance to cyclic loading appears to be very consistent with static tensile testing for different orientations. Moreover, self-heating fatigue tests appear more selective for pore defect detection, as shown by a significant decrease in the related specimen’s lifetime.</p>

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Room-Temperature Mechanical Properties of AD730® Alloy Processed by Powder Bed Fusion Laser Beam

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • M. Thomas,
  • O. Hubert,
  • B. Telmen,
  • F. Szmytka,
  • D. Locq,
  • A. Morel,
  • Q. Barrès,
  • N. Muller,
  • C. Tournier

摘要

The Additive Manufacturing (AM) ability of AD730® alloy by powder bed fusion laser beam (PBF-LB) is investigated for comparison with the cast & wrought AD730® alloy developed by Aubert & Duval for gas turbine applications. Several designs of experiments were needed to identify stable manufacturing conditions and build-up strategy in terms of low defect rate and microstructure soundness. The PBF-LB AD730® alloy exhibits columnar grains along the build direction. The resultant texture is close to a single-crystalline-like cube texture. Upon annealing, such a strong texture is preserved despite forming a network of fine transgranular secondary γ’ precipitates. Room-temperature tensile properties are encouraging, with yield stress between the coarse and fine-grain microstructures of cast & wrought AD730® for both orientations. No evidence of premature failure due to microcracks has been detected in the overall test specimens. Finally, room-temperature self-heating fatigue tests were conducted on specimens using cyclic loading. The resistance to cyclic loading appears to be very consistent with static tensile testing for different orientations. Moreover, self-heating fatigue tests appear more selective for pore defect detection, as shown by a significant decrease in the related specimen’s lifetime.