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Microstructure and Mechanical Properties of Laser Additively Manufactured Nickle based Alloy with External Nano Reinforcement: A Feasibility Study

Wang, Yachao
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703630944044

Abstract Details

2018, PhD, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
TiC nanoparticles (NPs) and GNPs(GNPs) are used to reinforce Inconel 718 (IN718) via selective laser melting process. Various post heat treatment methods with four levels of temperature, with or without the subsequent aging are carried out on the obtained pure IN718 and IN718-matrix nanocomposite materials. The effect of post heat treatment strategies on the microstructure and mechanical properties of the obtained materials is investigated. Meanwhile, multiscale simulation is performed to investigate the influence of laser parameters on the microstructure of SLM-processed Ni-Nb alloy, with the consideration of realistic thermal history and powder-to-dense phase transformation. The interaction between particle and solidification front is investigated, the engulfment/push behavior and overall distribution of TiC nanoparticles (NPs) in the dendrite solidification process of the binary alloy are revealed. It is found that with the increase of nTiC addition, the material microstructure is refined. Mechanical properties, including tensile, and anti-wear properties are effectively enhanced with the addition of external nano reinforcement. Multiscale numerical study proves that laser scan speed and degree of undercooling significantly affect the microstructure and overall distribution of NPs in a metal matrix. Higher laser scan speed results in higher cooling rate in the solidification region and alleviated micro-segregation ratio. A higher degree of undercooling leads to easier engulfment of NPs and overall more uniform distribution of NPs.
Jing Shi, Ph.D. (Committee Chair)
Jay Lee, Ph.D. (Committee Member)
Yijun Liu, Ph.D. (Committee Member)
Vijay Vasudevan, Ph.D. (Committee Member)
150 p.
Mechanical Engineering
Selective laser melting; Phase field; Metal matrix nano composite; Inconel 718; Graphene nanoplatelets; Thermal history

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Citations

  • Wang, Y. (2018). Microstructure and Mechanical Properties of Laser Additively Manufactured Nickle based Alloy with External Nano Reinforcement: A Feasibility Study [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703630944044

    APA Style (7th edition)

  • Wang, Yachao. Microstructure and Mechanical Properties of Laser Additively Manufactured Nickle based Alloy with External Nano Reinforcement: A Feasibility Study. 2018. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703630944044.

    MLA Style (8th edition)

  • Wang, Yachao. "Microstructure and Mechanical Properties of Laser Additively Manufactured Nickle based Alloy with External Nano Reinforcement: A Feasibility Study." Doctoral dissertation, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535703630944044

    Chicago Manual of Style (17th edition)

ucin1535703630944044
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This open access ETD is published by University of Cincinnati and OhioLINK.