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Deformation Characteristic and Microstructure Evolution of Spray Formed GH738
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Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials

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    Abstract:

    The hot flow behaviors and deformation model of spray formed superalloy GH738 were investigated using Gleeble-3500TM simulator at the temperature range of 950~1200℃, strain rate range of 0.13~6.5s-1 and reduction of 50%. The evolution of microstructure was studied by microscope and image analysis system. The results show that the flow stress decrease with increasing deformation temperature or decreasing strain rate. The hot deformation activation energy Q is 580.81kjmol-1. As the temperature increase, the necklace structures are obtained along the boundaries which are protuberated by the new recrystallized grains in the high dislocation-density serrated grain boundary zones. The structures show fully dynamic recrystallization characteristic at the temperature of 1100℃ while the higher temperature and the low strain rate forced the structure grown.

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[Wang Yue, Xu Wenyong, Liu Na, Zheng Liang, Yuan Hua, Li Zhou, Zhang Guoqing. Deformation Characteristic and Microstructure Evolution of Spray Formed GH738[J]. Rare Metal Materials and Engineering,2018,47(3):878~883.]
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History
  • Received:February 24,2016
  • Revised:June 20,2016
  • Adopted:July 15,2016
  • Online: April 11,2018
  • Published: