Al-Si-Cu-Mg-Ni活塞合金热压缩变形行为研究  

Study of Hot Compression Deformation Behavior of Al-Si-Cu-Mg-Ni Piston Alloy

作　　者：段洪波[1] 李远 杨伟[1] 魏琨 李建平[1] DUAN Hongbo;LI Yuan;YANG Wei;WEI Kun;LI Jianping(School of Materials and Chemical Engineering,Xi’an TechnologicalUniversity,Xi’an 710021,China;Inner Mongolia North Heavy Industries Group CO.,Ltd.,Baotou014033,China)

机构地区：[1]西安工业大学材料与化工学院,西安710021 [2]内蒙古北方重工业集团有限公司,包头014033

出　　处：《西安工业大学学报》2019年第3期311-317,共7页Journal of Xi’an Technological University

基　　金：陕西省重点研发计划项目(2018ZDXM-GY-137);陕西省教育厅服务地方专项计划项目(18JC013)

摘　　要：针对高功率柴油发动机活塞在高温下变形和烧蚀严重,导致活塞早期失效,使用寿命不能满足设计要求的问题,文中采用光学显微镜(OM)、透射电子显微镜(TEM)和热模拟实验机等实验仪器,研究了在不同热压缩变形参数下,AlSiCuMgNi活塞合金显微组织以及流变应力的变化规律,利用ZenerHollomon参数的双曲正弦函数来描述AlSiCuMgNi活塞合金热压缩变形流变应力行为。研究结果表明:该合金在高温压缩变形过程中存在动态回复和动态再结晶现象,流变应力值随应变速率的增大而增大,随温度的升高而减少;在高温低应变速率下,组织形貌由于动态再结晶而形成完整的亚晶结构;该合金的热变形激活能Q=294.08kJ·mol^-1,建立了AlSiCuMgNi活塞合金热压缩变形条件下的流变应力本构方程。The study intends to solve the problems that high power diesel engine pistons are liable to be deformed and ablated seriously at high temperatures,which leads to their early failure and their service life being unable to meet the design requirements.The change of the microstructure and flow stress of Al Si Cu Mg Ni piston alloy with different hot compression deformation parameters were studied by using an OM,a TEM and a thermo mechanical simulator.In addition,the hyperbolic sine function of the Zener hollomon parameter was used to describe the rheological stress behavior of the alloy under hot compression deformation.The results show that the dynamic recovery and recrystallization of the alloy exist in the process of high temperature compression deformation.The flow stress of the alloy decreases with the increased deformation temperature,and increases with the increased strain rate.At high temperature and low strain rate,its micro structure becomes a complete sub crystalline structure due to dynamic recrystallization.Its hot deformation activation energy is Q =294.08 kJ·mol^-1 .The constitutive equations of rheological stress under hot compression deformation of Al Si Cu Mg Ni piston alloy has been established.

关 键 词：AlSiCuMgNi活塞合金 热压缩 流变应力 显微组织 本构方程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]