Journal
ADDITIVE MANUFACTURING
Volume 30, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.addma.2019.100917
Keywords
Martensitic phase transformation; Ultrafine grained microstructure; Thermodynamics; Rapid solidification; Powder bed fusion
Funding
- Engineering and Physical Sciences Research Council [1686001]
- Future Manufacturing Hub in Manufacture using Advanced Powder Processes (MAPP) [EP/P006566/1]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available