【作者】 张昕； 李宏伟； 张宁； 陈官正；

【Author】 Zhang Xin;Li Hong-wei;Zhang Ning;Chen Guan-zheng;Northwestern Polytechnical University;

【机构】 西北工业大学；

【摘要】 本文通过脉冲电辅助拉伸实验研究了不同电参数下镍基高温合金宏观应力应变行为和微观组织演化规律。研究发现脉冲电流产生的电能越大,镍基高温合金的变形抗力降低越明显,同时伴随着塑性的下降;这是由于颈缩的出现导致局部温升过高而提前失效。电流密度小于51A/mm2时,脉冲电流对其微观组织影响较小;而当电流密度达到73A/mm~2时,材料在其再结晶温度以下发生再结晶,微观晶粒细化且织构强度减弱。更多还原

【Abstract】 The effect of pulsed current on flow stress and microstructure during deformation of Ni-based superalloy with different electrical parameters was studied by electrically-assisted tensile experiment. It is found that the flow stress of Ni-based superalloy decreases with the increase of electric energy, however, the elongation decreases due to the high temperature distributed in the necking part, which results in premature. It is found that the microstructure barely changes in the studied range of current density. When the current density reaches 73 A/mm~2, the dynamic recrystallization occurs below the recrystallization temperature, therefore, the grain is refined and the intensity of texture is weakened.更多还原