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In-situ Spectral Monitoring of Microstructure During Laser Melting Deposition: A Case Study of CoCrMoW Alloy
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Affiliation:

1.School of Mechanical Engineering, Tiangong University, Tianjin 300387, China;2.School of Computer Science and Technology, Tiangong University, Tianjin 300387, China;3.Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 12, 76131, Germany

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Fund Project:

National Key R&D Program of China (2017YFB1103604); National Natural Science Foundation of China (61772365); Tianjin Province Science and Technology Projects (17JCQNJC04500, 17JCYBJC15100)

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    Abstract:

    The relationship between the optical emission spectroscopy and the microstructure of CoCrMoW coatings by laser melting deposition was investigated. The relationship between the primary dendrite spacing and microhardness of CoCrMoW coatings at different laser powers of spectral signal was studied. A new spectral signal index, the integral area, was proposed, and the electron temperature was calculated from four discrete Cr I spectral lines. The results show that with increasing the laser power from 400 W to 1000 W, the average primary dendrite spacing is increased from 3.426 μm to 7.420 μm, and the microhardness HV0.2 is reduced from 3461 MPa to 3095 MPa. The integral area and electron temperature of the spectral is also increased with increasing the laser power. The primary dendrite spacing of the coating is positively linear-related with the spectral signal, while the microhardness of the coatings is negatively linear-related with the spectral signal. In this research, compared with the electron temperature, the integral area shows a better potential for the prediction of the primary dendrite spacing and microhardness of coatings.

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[Xia Yelin, Huang Zhaozhen, Chen Hanning, Liang Xiaodan, Shi Chuan. In-situ Spectral Monitoring of Microstructure During Laser Melting Deposition: A Case Study of CoCrMoW Alloy[J]. Rare Metal Materials and Engineering,2021,50(11):3901~3909.]
DOI:10.12442/j. issn.1002-185X. E20200042

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History
  • Received:September 02,2020
  • Revised:November 25,2020
  • Adopted:December 22,2020
  • Online: November 25,2021
  • Published: November 24,2021