期刊
MATERIALS & DESIGN
卷 89, 期 -, 页码 335-341出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.09.148
关键词
Selective laser melting; Steel; Microstructure; Hardness; Mechanical properties
资金
- NanoSteel Company
- German Science Foundation (DFG) [EC 111/26-1]
This paper demonstrates the successful processing of a high-strength Fe85Cr4Mo8V2C1 tool steel by selective laser melting (SLM). Based on tailored parameter variation studies, crack-free and highly dense FeCrMoVC parts (99.99% relative density) are obtained by this processing method. The applied localized high heat inputs during very short interaction times result in a fine, homogeneous microstructure composed of martensite, austenite, and carbides. This combination of phases together with the morphology of the microstructure results in excellent mechanical properties, such as a microhardness of 900 HV 0.1 (ca. 67 HRC) and a compressive strength of about 3800 MPa combined with a fracture strain up to 15%. Therefore, the SLM processing of this alloy enables a further increase of the hardness and compressive strength compared to the as-cast state. Altogether, processing the FeCrMoVC steel by SLM as one key additive manufacturing technology shows high potential for advanced tool design. (C) 2015 Elsevier Ltd. All rights reserved.
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