Effects of Pulse Current on Dynamic Recrystallization Behavior of GH4169 Superalloy
Effects of Pulse Current on Dynamic Recrystallization Behavior of GH4169 Superalloy
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DOI：
10.2320/matertrans.mbw201102
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发表时间：
2012-08
影响因子：
1.2
通讯作者：
Yang Liu;Lei Wang;Hui-Hong Liu;Xu-Dong Lu;Bei-jiang Zhang
中科院分区：
文献类型：
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作者：
Yang Liu;Lei Wang;Hui-Hong Liu;Xu-Dong Lu;Bei-jiang Zhang
在800°C的拉伸试验中，对GH4169合金施加脉冲电流。研究了脉冲电流对合金变形行为和再结晶的影响，并对其机理进行了探讨。结果表明，施加脉冲电流后，合金的变形抗力明显降低，伸长率明显提高。随着脉冲电流能量的增大，脉冲电流对合金强度和塑性的影响更为显著。结果表明，拉伸试验促进了位错运动，从而降低了合金的抗变形能力。脉冲电流的电效应降低了再结晶的初始温度，促进了动态再结晶成核。因此，相对于无脉冲电流的合金，在较低的温度下会发生动态再结晶。这是GH4169合金在脉冲电流作用下变形抗力降低、塑性变形能力提高的主要原因。
The pulse current was applied on the GH4169 alloy during tensile tests at 800°C. The effects of pulse current on the deformation behavior and recrystallization of the alloy were investigated, and the mechanisms were also discussed. The results show that the deformation resistance decreases and the elongation increases significantly by applying the pulse current during tensile tests of the alloy. And the effects of pulse current on the strength and plasticity of the alloy are more remarkable as the pulse current energy increases. It is found that the deformation resistance of the alloy can be decreased since the dislocation motion can be promoted during the tensile testing. The initial temperature of recrystallization can be reduced by the electric effect of the pulse current and the dynamic recrystalllization nucleation is promoted. Therefore, the dynamic recrystallization would occur at lower temperature than that of the alloy without pulse current. That is the main reason for the decreasing of deformation resistance and the increasing of plastic deformation ability of GH4169 alloy under the pulse current.