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Research on sub-surface recrystallization of single crystal nickel-based superalloy in micro-milling

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Abstract

The micro-structure/parts of single crystal nickel-based superalloy materials are extensively used in high temperature environments. The recrystallization mechanism of the machined workpiece sub-surface is explained through energy storage model. A micro-milling experiment of single crystal nickel-based superalloy DD98 was performed by simulating the working environment at high temperature and setting different heat treatment temperature. By scanning electron microscopy (SEM), the influence of sub-surface structural elements on the properties of micro-milling workpiece was analyzed. Experimental results indicate that the recrystallization layer thickness of single crystal nickel-based superalloy DD98 increases with the increase of heat treatment temperature. When this temperature is between 950 °C and 1150 °C, the recrystallization thickness is 5–20 μm. The recrystallization of sub-surface layer takes the form of equiaxed recrystallization. Those provide basic data for restraining recrystallization of single crystal materials and have good scientific significance.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51375082) and the Doctoral Start-up Fund of Liaoning University of Technology (XR2018003).

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, 121001, China

    Qi Gao & Po Jin

  2. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, China

    Ming Cai

Authors
  1. Qi Gao
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  2. Po Jin
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  3. Ming Cai
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Corresponding author

Correspondence to Qi Gao.

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Recommended by Associate Editor Yongho Jeon

Qi Gao is an Associate Professor at Liaoning University of Technology. He received a doctorate in mechanical engineering from Northeastern University. His research interests include micro precision process, digital manufacturing.

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Gao, Q., Jin, P. & Cai, M. Research on sub-surface recrystallization of single crystal nickel-based superalloy in micro-milling. J Mech Sci Technol 33, 3467–3472 (2019). https://doi.org/10.1007/s12206-019-0641-2

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  • DOI: https://doi.org/10.1007/s12206-019-0641-2

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