Shidong Wang , Wenhua Wu , Yue Sun , Zhigang Yang , Gang Sha , Wei Wang , Zengbao Jiao , Hao Chen
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引用次数: 0
Abstract
In high-molybdenum (Mo) maraging steels, the formation of coarse Mo-enriched precipitates during conventional hot processing can significantly compromise both strength and ductility. In this contribution, we utilized the laser powder bed fusion (L-PBF) technique to produce a high-Mo maraging steel with a nominal chemical composition of Fe-13Ni-12Co-10Mo-1W-1Ti (wt.%). Notably, the ultrafast cooling rate inherent to L-PBF successfully suppresses the formation of coarse Mo-enriched precipitates. The co-precipitation of high-density Ni3Ti and Mo-enriched nanoprecipitates within the direct-aged martensitic matrix was observed. As a result, despite containing ∼16% soft reverted austenite, the direct-aged samples exhibit an ultrahigh yield strength (YS) of ∼ 2.34 GPa and an ultrahigh ultimate tensile strength (UTS) of ∼2.57 GPa, with an acceptable uniform elongation (UE) of around 2.7%. This work may provide a new pathway for the development of ultrahigh-strength maraging steels.
期刊介绍:
Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.