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<p>Wire and arc additive manufacturing (WAAM) facilitates the production of substantial near-net-shape components by layer-by-layer deposition. This work examines the effects of post-heat treatments (PHTs) on the microstructure, elemental distribution, and mechanical properties of pulsed-WAAM Hastelloy C-276 thin walls. Characterisation was performed using SEM/EDS, XRD, and EBSD on as-deposited (AD) and PHTed samples. Solution annealing (SA) yielded regenerated equiaxed grains, in contrast to the AD&#xa0;and double-ageing (DA) conditions. SEM/EDS of SA-1 showed a homogeneous Mo distribution devoid of coarse Mo-rich precipitates, whereas EBSD indicated a significant decrease in low-angle grain boundaries (68.3% in AD). Microhardness reached a maximum of 336 HV (SA-1) and 326 HV (SA-2), in contrast to 302 HV (AD) and 260 HV (DA). SA-1 had the most significant enhancement in strength, increasing from 790 ± 16&#xa0;MPa (AD) to 892 ± 6&#xa0;MPa. The fracture morphology under all conditions was primarily ductile, with infrequent transgranular and intergranular characteristics.</p>

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Development of post-heat treatments to enhance the metallurgical and mechanical properties of pulsed directed energy deposited Ni-Cr-Mo superalloy-

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • M. D. Barath Kumar,
  • Vepa Gautham,
  • Pothula Dinakar,
  • Aditya Sahoo,
  • Nithin Joseph Reddy S A,
  • J. P. Oliveira,
  • N. Arivazhagan,
  • M. Manikandan

摘要

Wire and arc additive manufacturing (WAAM) facilitates the production of substantial near-net-shape components by layer-by-layer deposition. This work examines the effects of post-heat treatments (PHTs) on the microstructure, elemental distribution, and mechanical properties of pulsed-WAAM Hastelloy C-276 thin walls. Characterisation was performed using SEM/EDS, XRD, and EBSD on as-deposited (AD) and PHTed samples. Solution annealing (SA) yielded regenerated equiaxed grains, in contrast to the AD and double-ageing (DA) conditions. SEM/EDS of SA-1 showed a homogeneous Mo distribution devoid of coarse Mo-rich precipitates, whereas EBSD indicated a significant decrease in low-angle grain boundaries (68.3% in AD). Microhardness reached a maximum of 336 HV (SA-1) and 326 HV (SA-2), in contrast to 302 HV (AD) and 260 HV (DA). SA-1 had the most significant enhancement in strength, increasing from 790 ± 16 MPa (AD) to 892 ± 6 MPa. The fracture morphology under all conditions was primarily ductile, with infrequent transgranular and intergranular characteristics.