Effect of Ti Addition on Microstructural Evolution of Ni3Si

Qing Yu; Yao Ning Sun; Wen Lei Sun

doi:10.4028/www.scientific.net/KEM.522.123

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 522Effect of Ti Addition on Microstructural Evolution...

Effect of Ti Addition on Microstructural Evolution of Ni3Si

Abstract:

Laser cladding technique was used to form Ni3Si intermetallic coating by Ti addition on Ni-based superalloy substrate. The coating was investigated by optical microscopy and X-ray diffraction (XRD). The clad coating was dense, compact and smooth. An excellent bonding between the coating and the substrate was ensured by a strong metallurgical interface. The laser clad Ni3Si-Ti intermetallic coating has a rapidly solidified microstructure consisting of Ni (Si), Ni3Si (L12) and Ni31Si12 . The grain refinement effect has been achieved due to the occurrence of Ti in cladding layers. By increasing the proportion of Ti, the hardness decreased as the Ti content increasing, the peaks intensity of Ni31Si12 decreased.

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Key Engineering Materials (Volume 522)

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123-126

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https://doi.org/10.4028/www.scientific.net/KEM.522.123

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August 2012

Authors:

Qing Yu, Yao Ning Sun, Wen Lei Sun

Keywords:

Laser Cladding, Microstructure, Titanium

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