Effect of Pulse Current on Tensile Deformation Behavior of IN718 Alloy
Effect of Pulse Current on Tensile Deformation Behavior of IN718 Alloy
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DOI：
10.4028/www.scientific.net/amr.509.56
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
Yang Liu;Lei Wang;Fei Feng;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;Fei Feng;Xu-Dong Lu;Bei-jiang Zhang
本文对IN718合金在室温和高温拉伸过程中施加脉冲电流。研究了脉冲电流对合金变形行为的影响及其机制。结果表明，随着脉冲电流的增加，IN718合金在室温和1073 K拉伸过程中的变形抗力降低，延伸率显著增加。脉冲电流对合金强度和塑性的影响随脉冲电流能量的增加而增大。脉冲电流的电塑性效应可以促进位错的运动，从而降低合金拉伸变形时的变形抗力。脉冲电流降低了再结晶起始温度，促进了再结晶形核，使动态再结晶在比常规温度场更低的温度下发生成为可能。这是IN718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 performed on the IN718 alloy during tensile test at room temperature and elevated temperature in the present study. The effect of pulse current on the deformation behavior of the alloy and the mechanisms were investigated. The results show that the deformation resistance decreases and the elongation increases significantly of IN718 alloy during tensile test at room temperature and 1073 K with the increase of pulse current. And the effect of pulse current on the strength and plasticity of the alloy increases as pulse current energy increases. The electroplastic effect of pulse current can promote the dislocation motion, and thus decrease the deformation resistance of the alloy during the tensile deformation. The pulse current reduces the starting temperature of recrystallization, promotes the recrystalllization nucleation, and thus makes it possible that the dynamic recrystallization would occur at lower temperature than that in the conventional temperature field. This is the main reason for the decrease of deformation resistance and the increase of plastic deformation ability of IN718 alloy under pulse current.