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

Charlotte Cui; Harald Leitner; Jan Platl; Ronald Schnitzer

doi:10.1016/j.matchar.2023.112689

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

Charlotte Cui, Harald Leitner, Jan Platl, Ronald Schnitzer

voestalpine BÖHLER Edelstahl GmbH & Co KG

Research output: Contribution to journal › Article › Research › peer-review

Abstract

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.

Original language	English
Article number	112689
Number of pages	10
Journal	Materials characterization
Volume	197.2023
Issue number	March
Early online date	20 Jan 2023
DOIs	https://doi.org/10.1016/j.matchar.2023.112689
Publication status	Published - Mar 2023

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10.1016/j.matchar.2023.112689

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title = "Influence of platform preheating on in situ precipitation in an FeCoMo alloy during laser powder bed fusion",

abstract = "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.",

author = "Charlotte Cui and Harald Leitner and Jan Platl and Ronald Schnitzer",

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doi = "10.1016/j.matchar.2023.112689",

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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

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.

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JO - Materials characterization

JF - Materials characterization

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M1 - 112689

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

Abstract

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