Synchrotron x-ray induced real time observations of CoCr alloy layer formation by micro laser cladding

Yuji Sato; Masahiro Tsukamoto; Takahisa Shobu; Ritsuko Higashino; Yoshinori Funada; Yorihiro Yamashita; Yuu Sakon; Nobuyuki Abe

doi:10.1117/12.2288764

26 February 2018 Synchrotron x-ray induced real time observations of CoCr alloy layer formation by micro laser cladding

Yuji Sato, Masahiro Tsukamoto, Takahisa Shobu, Ritsuko Higashino, Yoshinori Funada, Yorihiro Yamashita, Yuu Sakon, Nobuyuki Abe

Author Affiliations +

Proceedings Volume 10523, Laser 3D Manufacturing V; 105230M (2018) https://doi.org/10.1117/12.2288764
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

The direct injection type laser cladding system using combined multi lasers, which supplies a clad powder from a center nozzle, was developed for realize of low dilution area and micro cladding. A fiber coupled diode laser was employed. The six-diode lasers were guided to focusing head with every optical fiber, which core diameter is 100 μm. Beam profile at focal point of the combined six lasers was set a spot diameter of 300 μm by CCD camera. Here, A cobalt-chromium alloy (CoCr-alloy) called by Stellite, which has excellent properties such as wear resistance, corrosion resistance and resistance to environment, was used as a cladding material. The focusing head has a function to supply a CoCr-alloy powder at a focal point from a center nozzle. When the laser irradiation and powder supply are simultaneously performed toward to a stainless steel 304 substrate, the CoCr-alloy powder was melted and solidified on the substrate to form a cladding layer. The melting and solidification process for CoCr-alloy was observed in real time using synchrotron radiation imaging technique at BL22XU in SPring-8. From results, it was clarified that the CoCralloy melt-solidification phenomenon greatly differs for laser output power. At the output power of 60W, it was found that a minimum amount of molten pool was formed and then solidified to form the cladding layer.

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Yuji Sato, Masahiro Tsukamoto, Takahisa Shobu, Ritsuko Higashino, Yoshinori Funada, Yorihiro Yamashita, Yuu Sakon, and Nobuyuki Abe "Synchrotron x-ray induced real time observations of CoCr alloy layer formation by micro laser cladding", Proc. SPIE 10523, Laser 3D Manufacturing V, 105230M (26 February 2018); https://doi.org/10.1117/12.2288764

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