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@ARTICLE{KultzUnti:641733,
      author       = {Kultz Unti, Luiz Fernando and Aota, L. S. and Lopes, E. S.
                      N. and Ribamar, G. G. and Schell, N. and Oliveira, J. P. and
                      Gault, B. and Avila, J. A. and Jardini, A. L. and Zilnyk, K.
                      D.},
      title        = {{M}icrostructural evolution in high-temperature direct
                      aging on {PBF}-{LB} 15-5{PH} stainless steel},
      journal      = {Acta materialia},
      volume       = {303},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PUBDB-2025-05144},
      pages        = {121747},
      year         = {2026},
      note         = {Waiting for fulltext},
      abstract     = {High solidification rates and in situ heat treatments are
                      commonly found in additive manufacturing (AM) ofsteels,
                      resulting in a complex and far-from-equilibrium
                      microstructure. Therefore, standard post-processing
                      heattreatments commonly applied to wrought steels can favor
                      the occurrence of different phenomena and can changethe
                      phase transformation sequence, due to the unique
                      microstructure obtained by powder bed fusion – laserbeam
                      (PBF-LB). This work reports the microstructural evolution of
                      15-5 precipitation hardening (PH) stainlesssteel
                      manufactured by PBF-LB during direct aging heat treatments
                      at 621 ◦C (AMS H1150 standard condition), aroute used to
                      increase fracture toughness due to the martensite reversion
                      and precipitates coarsening. Thereversion of martensite into
                      a Ni-rich austenite, predicted by kinetic calculations, was
                      confirmed by high-energyX-ray diffraction (HE-XRD), being
                      preferentially nucleated close to the copper-rich
                      precipitates (CRPs), whichcan act as a preferential
                      nucleation site. CRPs presented an oval shape, as confirmed
                      by electronic microscopy(SEM and TEM) and atom probe
                      tomography (APT). Fast Fourier transform (FFT) analysis of
                      high-resolution TEM(HR-TEM) images suggests CRPs still
                      present the metastable untwined 3R-type structure after 8 h,
                      rather than themost stable FCC structure. The presence of
                      retained austenite, inherent to PBF-LB-processed PH steels,
                      affects theCRPs evolution in different phases, and the CRPs
                      themselves act as nucleation sites for Nb(C,N)
                      secondaryprecipitation. These findings emphasize the
                      necessity of microstructure-oriented heat treatment routes
                      to unlockthe full potential of additively manufactured PH
                      stainless steels.},
      cin          = {DOOR ; HAS-User / Hereon},
      ddc          = {670},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)Hereon-20210428},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / FS-Proposal: I-20210563
                      (I-20210563)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(DE-H253)I-20210563},
      experiment   = {EXP:(DE-H253)P-P07-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.actamat.2025.121747},
      url          = {https://bib-pubdb1.desy.de/record/641733},
}