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Microstructure and mechanical properties of friction welded carbon steel (EN24) and nickel based superalloy (IN718)

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  • Available online: 11 February 2020
  • In this study, continuous drive rotary friction welding (FW) is performed to join cylindrical specimen of carbon steel (EN24) and nickel based superalloy (IN718). The microstructures of three distinguish weld zones such as weld interface (WI)/thermo mechanically affected zone (TMAZ), heat affected zone (HAZ), and base metals were examined. The joint was observed to be free from defects with uneven flash formation. Electron Back Scattered Diffraction (EBSD) analysis shows substantial changes in high angle grain boundaries, low angle grain boundaries and twin boundaries in TMAZ and HAZ areas. Also significant refinement in grain size (2-5μm) was observed at WI/TMAZ with reference to base metals. The possible causes of these are discussed. The microhardness profile across welded joint shows variation in hardness. The changes in hardness were ascribed to grain refinement, phase transformation, and dissolution of strengthening precipitates. The tensile test results reveal that joint efficiency as much as 100% can be achievable by this method.
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  • The authors acknowledge to KCTI (Kalyani Centre for Technology & Innovation), Bharat Forge Ltd, Pune and DSIR (Department of Scientific and Industrial Research), Govt. of India for providing financial assistance, library and laboratory facilities. The authors are gratefulness to review committee of Bharat Forge Ltd, Pune to allow for publication. Also authors are thankful to Vinayak Pawar and Santosh Dhage for their assistance in various aspects of the project. Finally authors are thankful to K. Chethan, for valuable suggestion, guidance and discussion.

     

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Microstructure and mechanical properties of friction welded carbon steel (EN24) and nickel based superalloy (IN718)

  • Corresponding author:

    V. T. Gaikwad    E-mail: prajwalvijay75@gmail.com

  • 1) Kalyani Centre for Technology and Innovation, Bharat Forge Limited, Pune 411036, India
  • 2) Department of Materials Engineering, Defense Institute of Advance Technology, Pune 411025, India

Abstract: In this study, continuous drive rotary friction welding (FW) is performed to join cylindrical specimen of carbon steel (EN24) and nickel based superalloy (IN718). The microstructures of three distinguish weld zones such as weld interface (WI)/thermo mechanically affected zone (TMAZ), heat affected zone (HAZ), and base metals were examined. The joint was observed to be free from defects with uneven flash formation. Electron Back Scattered Diffraction (EBSD) analysis shows substantial changes in high angle grain boundaries, low angle grain boundaries and twin boundaries in TMAZ and HAZ areas. Also significant refinement in grain size (2-5μm) was observed at WI/TMAZ with reference to base metals. The possible causes of these are discussed. The microhardness profile across welded joint shows variation in hardness. The changes in hardness were ascribed to grain refinement, phase transformation, and dissolution of strengthening precipitates. The tensile test results reveal that joint efficiency as much as 100% can be achievable by this method.

Acknowledgements  The authors acknowledge to KCTI (Kalyani Centre for Technology & Innovation), Bharat Forge Ltd, Pune and DSIR (Department of Scientific and Industrial Research), Govt. of India for providing financial assistance, library and laboratory facilities. The authors are gratefulness to review committee of Bharat Forge Ltd, Pune to allow for publication. Also authors are thankful to Vinayak Pawar and Santosh Dhage for their assistance in various aspects of the project. Finally authors are thankful to K. Chethan, for valuable suggestion, guidance and discussion.
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