TY - JOUR

T1 - Influence of platform preheating on in situ precipitation in an FeCoMo alloy during laser powder bed fusion

AU - Cui, Charlotte

AU - Leitner, Harald

AU - Platl, Jan

AU - Schnitzer, Ronald

N1 - Publisher Copyright: © 2023 The Author(s)

PY - 2023/3

Y1 - 2023/3

N2 - The nanostructure of a laser powder bed fused (LPBF) FeCoMo maraging alloy was investigated with atom probe tomography (APT). Two as-built conditions were examined: without platform preheating and with a nominal platform preheating temperature T P=500°C. The results showed that the martensite start temperature of the FeCoMo alloy is lower than T P and the intermetallic strengthening μ-phase precipitates from the martensite phase and not from the austenite phase. By comparing the μ-phase precipitation stages in the specimens, a model for the temperature distribution during LPBF with T P=500°C was proposed. It was concluded that the platform surface did not attain the nominal preheating temperature and that the temperature in the built part decreased with increasing distance from the platform. Intrinsic heat treatment (IHT) during LPBF alone did not provide sufficient energy (temperature and/or time) for μ-phase precipitation.

AB - The nanostructure of a laser powder bed fused (LPBF) FeCoMo maraging alloy was investigated with atom probe tomography (APT). Two as-built conditions were examined: without platform preheating and with a nominal platform preheating temperature T P=500°C. The results showed that the martensite start temperature of the FeCoMo alloy is lower than T P and the intermetallic strengthening μ-phase precipitates from the martensite phase and not from the austenite phase. By comparing the μ-phase precipitation stages in the specimens, a model for the temperature distribution during LPBF with T P=500°C was proposed. It was concluded that the platform surface did not attain the nominal preheating temperature and that the temperature in the built part decreased with increasing distance from the platform. Intrinsic heat treatment (IHT) during LPBF alone did not provide sufficient energy (temperature and/or time) for μ-phase precipitation.

UR - http://www.scopus.com/inward/record.url?scp=85146861120&partnerID=8YFLogxK

U2 - 10.1016/j.matchar.2023.112689

DO - 10.1016/j.matchar.2023.112689

M3 - Article

VL - 197.2023

JO - Materials characterization

JF - Materials characterization

SN - 1044-5803

IS - March

M1 - 112689

ER -