期刊
SCRIPTA MATERIALIA
卷 152, 期 -, 页码 122-126出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.04.024
关键词
Laser welding; Synchrotron radiation; Shape memory alloys (SMA); Phase transformation; Additive manufacturing
类别
资金
- National Funds through the Portuguese Foundation for Science and Technology (FCT-MCTES) [UID/CTM/50025/2013]
- FEDER funds through the COMPETE 2020 Programme [POCI-01-0145-FEDER-007688]
- FCT [PEst-C/EME/UI0285/2013]
- FEDER funds through the program COMPETE Programa Operacional Factores de Competitividade [CENTRO-07-0224-FEDER-002001]
- SciTech Science and Technology for Competitive and Sustainable Industries, RAMP
- D project - by Programa Operacional Regional do Norte (NORTE2020)
- FCT-MCTES [PEst-OE/EME/UI0667/2014, SFRH/BD/85047/2012]
Laser additive manufacturing of NiTi generates complex microstructural features not fully understood yet. Thermal similarities between laser microjoining and laser additive manufacturing, enables correlating the effect of the laser on the material in both processes. To clarify them, a simplified yet accurate approach was employed: in-situ X-ray diffraction was used to determine the local transformation temperatures along the thermally affected regions in a laser processed NiTi thin sheet. The observed gradient of transformation temperatures is related to local chemical compositional changes through Ni depletion and residual stresses, explaining the peculiar micro-structural and mechanical features observed in additive manufacturing of NiTi. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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