Effect of a direct aging heat treatment on the microstructure and the tensile properties of a 18Ni-300 maraging steel produced by Laser Powder Bed Fusion
Küçük Resim Yok
Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The microstructure and the tensile properties of a 18Ni-300 maraging steel manufactured by Laser Powder Bed Fusion (L-PBF) were investigated after a Direct Aging Treatment (DAT) and compared to those obtained after a conventional Solution and Aging Treatment (SAT). DAT results in a 5% lower strength and a 70–80% higher ductility than SAT. The crystallite size of martensite laths and the characteristics of the submicrometric compounds precipitated during aging are very similar between the two variants. The different properties are attributed to the higher content of austenite (both residual and reverted) in DAT material, resulting from the Ni, Ti and Mo segregation during L-PBF. Such an austenite increases tensile ductility through a Transformation Induced Plasticity (TRIP) effect that was demonstrated by investigating the microstructure with Transmission Electron Microscopy (TEM) close to the fracture surface where deformation is localized. © 2023 Elsevier B.V.
Açıklama
Anahtar Kelimeler
Austenite, Laser Powder Bed Fusion, Maraging steel, Tensile ductility, TRIP effect, Austenite, Crystallite size, High resolution transmission electron microscopy, High strength steel, Microstructure, Plasticity, Ageing treatments, Aging heat treatment, Direct aging, Laser powder bed fusion, Laser powders, Powder bed, Solution treatments, Tensile ductility, Transformation induced plasticity, Transformation induced plasticity effect, Maraging steel
Kaynak
Materials Science and Engineering A
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
872
