Influence of Different Surface- and Heat Treatments; Elevated Temperature, Orientation on the Fatigue Properties of Ti6Al4V Processed by L-PBF for Controlled Powder Properties

Benjamin Meier*, Fernando Warchomicka, Reinhard Kaindl, Christoph Sommitsch, Wolfgang Waldhauser

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in Buch/BerichtBegutachtung

Abstract

While static mechanical properties of Laser Powder Bed Fusion (L-PBF) processed titanium alloy Ti6Al4V Grade 5 are sufficient and comparable to classic production processes (DebRoy et al. in Prog Mater Sci 92:112–224 [1]; Vrancken et al. in J Alloys Compd 541:177–185 [2]) the fatigue properties of L-PBF lack behind (Leuders et al. in Int J Fatigue 48:300–307 [3]; Nicoletto in Int J Fatigue [4]). However, the reason for this issue are not completely clear and uniquely assignable as combination of (sub surface) porosity, microstructure and surface roughness. This work aims to investigate the influence of several factors on the fatigue properties of controlled, single powder patch of Ti6Al4V. The use of a single patch eliminates the influences of mechanical and chemical powder properties. The investigated factors comprise mechanical and electrochemical polishing (EP) surface treatment, heat treatment (stress relief SR, furnace annealing FA, hot isostatic pressing HIP), print orientation (vertical and horizontal) and load cases (R = −1, R = 0.1). Additionally, a set of tests is performed at 80 °C. For both load cases HIP and machining show a positive impact with a higher influence of machining. For load case R = 0.1 HCF (σaD, 50%) for HIP and machined is around 400 MPa while the same surface treatment but FA reach 218 MPa and SR/EP samples at just 111 MPa. Elevated environmental temperature and horizontal orientation have a minor positive impact. For R = −1 the overall gap narrows to 300 for HIP/machined and 175 MPa for SR/EP respectively.

Originalspracheenglisch
TitelFatigue and Fracture of Materials and Structures
ErscheinungsortCham
Herausgeber (Verlag)Springer Science and Business Media Deutschland GmbH
Seiten235-243
Seitenumfang9
ISBN (elektronisch)978-3-030-97822-8
ISBN (Print)978-3-030-97821-1
DOIs
PublikationsstatusVeröffentlicht - 2022

Publikationsreihe

NameStructural Integrity
Band24
ISSN (Print)2522-560X
ISSN (elektronisch)2522-5618

ASJC Scopus subject areas

  • Tief- und Ingenieurbau
  • Bauwesen
  • Werkstoffmechanik

Fields of Expertise

  • Advanced Materials Science
  • Mobility & Production

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