超声振动对半固态ZL101合金成形微凸台微观组织的影响  

Effect of ultrasonic vibration on microstructure of semi-solid ZL101 alloy forming micro-convex platform

作　　者：张钧铭 于沪平[1] 乔云 ZHANG Jun-ming;YU Hu-ping;QIAO Yun(Institute of Forming Technology and Equipment,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]上海交通大学塑性成形技术与装备研究院,上海200030

出　　处：《塑性工程学报》2020年第8期44-51,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51635005)。

摘　　要：在将半固态成形技术应用于板料镦挤成形工艺的基础上,提出超声振动辅助板料镦挤微触变成形复合工艺,并且基于微凸台特征搭建了超声振动辅助板料体积微触变实验装置。通过与无超声振动实验进行对比,研究了超声振动对微凸台微观组织的影响。实验结果表明,施加超声振动会打散固相颗粒的连接,导致在成形过程中变形机制发生变化。同时超声振动可以明显改善凸台顶部的液相偏析缺陷。结合圆环镦粗理论认为微凸台触变成形过程中板料存在分流区,挤压流动占优阶段施加超声振动会导致分流区的范围减小,进而降低微凸台的成形高度。Based on the application of semi-solid forming technology in sheet metal upsetting and extrusion process,a composite process of ultrasonic vibration-assisted micro-thixotropic upsetting and extrusion of sheet metal was proposed,and an experimental device of ultrasonic vibration-assisted micro-thixotropic deformation of sheet metal volume was built based on the characteristics of micro-convex platform. The effect of ultrasonic vibration on the microstructure of micro-convex platform was studied by comparing with the non-ultrasonic vibration experiment. The experimental results show that ultrasonic vibration can break up the bonding of solid particles and change the deformation mechanism during the forming process. At the same time,ultrasonic vibration can significantly improve the liquid phase segregation defects at the top of the micro-convex platform. According to the theory of ring upsetting,there is a shunt zone in the sheet metal during thixoforming of the micro-convex platform,and the application of ultrasonic vibration can reduce the range of the shunt zone in the stage that the extrusion flow is dominant,thus the forming height of the micro-convex platform is reduced.

关 键 词：半固态 超声振动 微成形 板料体积成形 

分 类 号：TG306[金属学及工艺—金属压力加工]