Effects of Electropulsing Treatment on the Precipitation Behaviour of Grain Boundary Carbides in GH3044 Alloy

Yang Liu; Lei Wang; Yu Chen Wang; Hong Yan Liu; Xue Jiao Chen; Yan Yu

doi:10.4028/www.scientific.net/MSF.654-656.464

Paper Titles

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The Effect of Alloying Elements on Microstructure and Strength Property of Dual Two-Phase Intermetallic Alloys Based on Ni₃Al-Ni₃V Pseudo-Binary Alloy System
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Phase Transition and Ordering Temperatures of TiAl-Mo Alloys Investigated by In Situ Diffraction Experiments
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Effect of Y on Microstructure and Mechanical Properties of a Ti Alloy
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Effects of Electropulsing Treatment on the Precipitation Behaviour of Grain Boundary Carbides in GH3044 Alloy
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Property Responses in Nb-Si-Hf-Ti-Al-W-B-Cr Alloys for High-Temperature Applications
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The Effect of Refractory Elements on Microstructure and Mechanical Properties of Ni₃(Si,Ti) Intermetallic Alloys
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Microstructure and High Temperature Strength in Fe₃Al Base Alloys Containing Fine Carbide Particles
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Microstructure and Mechanical Properties of Al Added Ni₃(Si,Ti) Intermetallic Thin Sheets
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Effects of Electropulsing Treatment on the Precipitation Behaviour of Grain Boundary Carbides in GH3044 Alloy

Abstract:

The effects of electropulsing treatment on the precipitation behaviour of grain boundary carbides in GH3044 alloy were investigated. The results showed that the initial temperature of precipitation of M23C6 type carbides on grain boundary could be decreased by electropulsing treatment under the condition of high current density of 10.0kA/mm2 with a frequency of 5Hz and pulse width of 15s. The volume percentage of M23C6 type carbide was greatly increased to 274.60% comparing with that of the aging treatment at the same temperature. However, the precipitation of M23C6 type carbide was inhibited by electropulsing treatment under the condition of high frequency of 45Hz with the current density of 2kA/mm2 and pulse width of 15s. The volume percentage of M23C6 type carbide was decreased to 18.81% comparing with that of the aging treatment at the same temperature. It has been found that the diffusion of solute atom in the alloy can be promoted by the electric effect with the electropulsing. As a result, the thermodynamic condition and kinetics of the precipitation of M23C6 type carbide were changed, and both the initial and peak temperatures of precipitation were decreased.