摘要
在5356铝合金电弧增材制造时,采用随电弧同步移动的搅拌针在熔池内施加不同频率(30、40、50kHz)超声搅拌,结果表明:增材层组织与未施加超声搅拌时相比,晶粒细化,柱状晶数目减少,等轴晶数目增加;且随着超声频率增加,晶粒细化更加明显;增材层孔隙率随超声搅拌频率增加呈降低趋势,在30、40、50 kHz时分别为0.73%、0.64%、0.59%,但均高于未加超声搅拌的试样(0.2%);随着超声搅拌频率增加,增材层强度与塑性均有所提升:增材层的抗拉强度在0、30、40、50 kHz时分别为266.57、278、282、299 MPa,伸长率分别为30.67%、31.54%、35.53%、41.86%。
In the arc additive manufacturing(WAAM)of aluminum alloy,different frequencies(30,40,50 kHz)of ultrasonic stirring were applied in the molten pool using a stirring needle moving synchronously with the arc.Results show that the grains of the additive layer are refined,the number of columnar crystals decreases,and the number of equiaxed crystals increases compared with that without ultrasonic stirring,and the grain refinement becomes more obvious as the ultrasonic frequency increases.The porosity of the additive layer decreases with increasing ultrasonic frequency,which is 0.73%,0.64%,and 0.59%at 30,40,50 kHz,respectively,but no more than 0.2%of the specimen without ultrasonic stirring.When ultrasonic frequency is 0,30,40,50 kHz,the tensile strength of the additive layer is 266.57,278,282,and 299 MPa,and the elongation is 30.67%,31.54%,35.53%,41.86%,respectively.With the increase in ultrasonic stirring frequency,the strength and plasticity of the reinforced layer increase.
作者
彭力真
游国强
王磊
李琪
曾升
Peng Lizhen;You Guoqiang;Wang Lei;Li Qi;Zeng Sheng(School of Materials Science and Engineering,Chongqing University,Chongqing 400045,China;Chongqing Chang’an Automobile Co.,Ltd,Chongqing 400020,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第5期1800-1808,共9页
Rare Metal Materials and Engineering
基金
广东省重点研发项目(2020B010186002)
重庆市重点研发项目(cstc2019jscx-fxydx0003)
大型仪器设备开放基金(202103150177)。
关键词
铝合金
超声搅拌
增材制造
显微组织
力学性能
aluminum alloy
ultrasonic stirring
WAAM
microstructure
mechanical property
