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The Effects of Electron Beam Welding Parameters on Microstructure and Properties of GH4738 Alloy

  • Xinxu LiEmail author
  • Yong Zhang
  • Peihuan Li
  • Shaomin Lv
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 217)

Abstract

The GH4738 alloy is widely applied in different industries due to excellent strength and toughness matching stability and a low crack propagation rate. There are several welding methods used in GH4738 alloy. In order to increase the demand for high speed and low distortion welding, electron beam welding is introduced into jointing engineering pieces. The purpose of this study was to evaluate the effect of electron beam welding parameters (welding speed and beam current) on macroscopic morphology, the room temperature tensile properties, microstructure and microhardness of GH4738 alloy. According to the macroscopic morphology, there is a very narrow heat-affected zone during electron beam welding process. By analyzing microstructure, it could be concluded that the great temperature gradient in the small weld zone provides favorable conditions for the growth of the columnar crystal. Furthermore, the value of microhardness in the weld area is far lower than the value of microhardness in the base metal, especially in heat-affected zone. Eventually, according to these results, optimum electron beam welding parameters is selected. When the welding speed is 20 mm/s and beam current is 33 mA, there is more compact macroscopic morphology and better mechanical properties in the weldment and the hot affecting zone is narrow. What’s more, the microhardness and the room tensile strength of weldments are excellent after heat treatment.

Keywords

Electron beam welding GH4738 Superalloy Mechanical properties Microstructure 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Xinxu Li
    • 1
    • 2
    Email author
  • Yong Zhang
    • 1
  • Peihuan Li
    • 1
  • Shaomin Lv
    • 1
    • 3
  1. 1.Science and Technology on Advanced High Temperature Structural Materials LaboratoryAECC Beijing Institute of Aeronautical MaterialsBeijingChina
  2. 2.School of MetallurgyNortheastern UniversityShenyangChina
  3. 3.Institute for Advanced Materials and Technology, University of Science and Technology BeijingBeijingChina

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