期刊
ADDITIVE MANUFACTURING
卷 30, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.addma.2019.100917
关键词
Martensitic phase transformation; Ultrafine grained microstructure; Thermodynamics; Rapid solidification; Powder bed fusion
资金
- Engineering and Physical Sciences Research Council [1686001]
- Future Manufacturing Hub in Manufacture using Advanced Powder Processes (MAPP) [EP/P006566/1]
A key feature when using martensitic steels is the proportion of retained austenite present in the final component. Martensitic steels manufactured by laser powder-bed fusion (LPBF) have been shown to have more retained austenite than when conventionally manufactured. The LPBF microstructure is characterised by small grains containing ultrafine solidification cells (< 1 mu m). This study shows that the solidification cells can fully suppress thermal martensite. The retained austenite is highly metastable, and will readily transform to deformation martensite either in-build from thermal strain or post-build from deformation. This raises concerns around sample preparation methods causing incorrect phase quantification in LPBF-built martensitic steels.
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