脉冲电流作用下GH4169合金拉伸塑性及再结晶行为  

Tensile plasticity and recrystallization behavior of GH4169 alloy under action of pulse current

作　　者：刘超 孙祥云[1,2,3] 周金盛 张诗佳 高军芳 LIU Chao;SUN Xiang-yun;ZHOU Jin-sheng;ZHANG Shi-jia;GAO Jun-fang(Xingtai Polytechnic College,Xingtai 054000,China;Valve Intelligent Manufacturing Equipment Engineering Research Center,Xingtai 054000,China;Hebei Middle and Small Types Non-Standard Equipment Technology Innovation Center,Xingtai 054000,China)

机构地区：[1]邢台职业技术学院,河北邢台054000 [2]阀门智能制造装备工程研究中心,河北邢台054000 [3]河北省中小型非标装备技术创新中心,河北邢台054000

出　　处：《塑性工程学报》2021年第8期169-174,共6页Journal of Plasticity Engineering

基　　金：青年人才及软科学专项(2020ZZ045)。

摘　　要：以典型高温合金材料GH4169为研究对象,在一定温度下对材料进行拉伸变形,并分别施加不同密度的脉冲电流,研究脉冲电流对拉伸过程中材料的塑性状态以及动态再结晶行为的影响规律及机理。利用金相显微镜观察拉伸断口侧面的显微组织形貌及再结晶状态,并利用透射电子显微镜对变形后材料内部的位错组态进行分析。结果表明,脉冲电流能够在一定范围内降低拉伸变形抗力。在温度及变形量一定的前提下,施加脉冲电流可以促进原子扩散,加速位错攀移,从而显著缩短再结晶形核时间,促进动态再结晶过程,且随电脉冲密度增大,这种促进作用更加明显。A typical superalloy GH4169 was taken as the research object,the influence law and mechanism of pulse current on the tensile deformation plasticity and dynamic recrystallization behavior of the material during tensile process were studied at a certain temperature under pulse current with different densities.Microstructure morphology and recrystallization state of tensile fracture side surface were observed by metallographic microscope.The dislocation configuration inside the deformed material was analyzed by transmission electron microscope.The results show that the pulse current can reduce the tensile deformation resistance in a certain range.With the fixed temperature and deformation,the application of pulse current can promote the atom diffusion and accelerate the dislocation climbing,thus,the nucleation time of recrystallization is significantly shortened and the recrystallization process is promoted,and with the increase of electric pulse density,the promoting effect becomes more obvious.

关 键 词：GH4169 脉冲电流 拉伸变形 塑性 再结晶 

分 类 号：TG146.1[一般工业技术—材料科学与工程]