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对GH4199合金进行不同时间的高密度电脉冲处理,研究高密度电脉冲下合金组织的演化及处理后的拉伸性能。结果表明,高密度电脉冲显著加速合金中原子的扩散,与常规时效状态相比,γ′相的长大激活能(89.86kJ/mol)降低64.31%,使γ′相及晶界碳化物的析出及长大速度加快。高密度电脉冲处理使合金强度随处理时间的延长而提高,塑性无显著变化。脉冲电流下γ′相的长大及晶界碳化物的析出是阻碍位错运动、提高塑性变形抗力的主要原因;而晶界碳化物呈链状分布,塞积位错可以通过碳化物间隙穿过晶界,使合金塑性未明显劣化。
The GH4199 alloy was treated with high-density electric pulse at different time to study the evolution of the alloy structure under high-density electric pulse and the tensile properties after treatment. The results show that the high-density electrical pulse significantly accelerates the diffusion of atoms in the alloy. The growth activation energy (89.86kJ / mol) of the γ ’phase is reduced by 64.31% compared with the conventional aging condition, and the γ’ phase and the grain boundary carbide Precipitation and growth speed up. High-density electrical pulse treatment increases the strength of the alloy with the prolongation of the treatment time, with no significant changes in plasticity. Under the pulse current, the growth of γ ’phase and the precipitation of grain boundary carbide are the main reasons that impede the movement of dislocation and improve the resistance to plastic deformation. However, the grain boundary carbides distribute in a chain, Grain boundaries, the plasticity of the alloy was not significantly deteriorated.