TY - CHAP
T1 - Influence of Different Surface- and Heat Treatments; Elevated Temperature, Orientation on the Fatigue Properties of Ti6Al4V Processed by L-PBF for Controlled Powder Properties
AU - Meier, Benjamin
AU - Warchomicka, Fernando
AU - Kaindl, Reinhard
AU - Sommitsch, Christoph
AU - Waldhauser, Wolfgang
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Additive manufacturing
KW - Electrochemical polishing
KW - Fatigue
KW - Heat treatment
KW - Hot isostatic pressing
KW - L-PBF
KW - Powder properties
KW - Surface treatment
UR - http://www.scopus.com/inward/record.url?scp=85130552317&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-97822-8_27
DO - 10.1007/978-3-030-97822-8_27
M3 - Chapter
AN - SCOPUS:85130552317
SN - 978-3-030-97821-1
T3 - Structural Integrity
SP - 235
EP - 243
BT - Fatigue and Fracture of Materials and Structures
PB - Springer Science and Business Media Deutschland GmbH
CY - Cham
ER -