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Microstructure and micromechanics features of Ni-Ti-Si coating deposited by laser cladding
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Affiliation:

School of materials engineering,Shanghai University of Engineering Science

Clc Number:

TG115

Fund Project:

National Natural Science Foundation of China [grant numbers 51605276, 51375294, and 51405288], Shanghai Automobile Industry Technology Development Fund [grant number 1604], Shanghai Science and Technology Committee Innovation Grant [grant numbers 17JC1400600, 17JC1400601].

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    Abstract:

    A cladding layer 55Ni-35Ti-10Si (at.%) was synthesized on copper using laser cladding in this paper. It was composed of two kinds of microstructures. The microstructures of the cladding layer were characterized by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). According to the analysis results, phases appeared in upper layer should be Ti solid solution+Ni3Si and the morphology was dendritic. The under layer was composed of Ti solid solution+ Cu solid solution and the morphology was cellulate. The crystal growth in solidification process was analysed using a modification model which is combined Kurz-Giovanola-Trivedi (KGT) model with Lipton-Kurz-Trivedi (LKT) model. Mechanism of cladding layer stratification was studied by thermodynamics. Microhardness of cladding layer was tested. The average hardness of upper layer and under layer were 800HV and 220HV, respectively. The synthesis of under layer increased the stability of cladding layer.

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[Li Mingchuan, Zhang Peilei, Yu Zhishui, Yan Hua, Ye Xin, Li Shaowei. Microstructure and micromechanics features of Ni-Ti-Si coating deposited by laser cladding[J]. Rare Metal Materials and Engineering,2019,48(4):1225~1230.]
DOI:10.12442/j. issn.1002-185X.20170864

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History
  • Received:September 23,2017
  • Revised:November 06,2017
  • Adopted:November 08,2017
  • Online: May 13,2019
  • Published: