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

被引：6

作者：

Cui, Charlotte ^{[1
]}

Leitner, Harald ^{[2
]}

Platl, Jan ^{[1
]}

Schnitzer, Ronald ^{[1
]}

机构：

[1] Univ Leoben, Dept Mat Sci, A-8700 Leoben, Austria

[2] Voestalpine Bohler Edelstahl GmbH & Co KG, A-8605 Kapfenberg, Austria

来源：

MATERIALS CHARACTERIZATION | 2023年 / 197卷

关键词：

Laser powder bed fusion; LPBF; Intrinsic heat treatment; IHT; Spinodal decomposition; Maraging steel; Cobalt martensite; Co-martensite; Intermetallics; -phase; Tool steel; Additive Manufacturing; AM; SPINODAL DECOMPOSITION; BEHAVIOR; STEEL; CO;

D O I：

10.1016/j.matchar.2023.112689

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 TP = 500 degrees C. The results showed that the martensite start temperature of the FeCoMo alloy is lower than TP and the intermetallic strengthening mu-phase precipitates from the martensite phase and not from the austenite phase. By comparing the mu-phase precipitation stages in the specimens, a model for the temperature distribution during LPBF with TP = 500 degrees 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 mu-phase precipitation.

引用

页数：10

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