超声振动和微量Sr+Sc对A380合金组织的影响及作用机理  

Effects and action mechanism of trace Sr+Sc and ultrasonic vibration on microstructure of A380 Alloy

作　　者：雷吉平 余剑武[1] 罗红[1] 陈健美 李伟[2] 李承波[3] LEI Jiping;YU Jianwu;LUO Hong;CHEN Jianmei;LI Wei;LI Chengbo(State Key Lab of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;School of Mechanical Engineering,Hunan International Economics University,Changsha 410205, China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南涉外经济学院机械工程学院,长沙410205 [3]中南大学材料科学与工程学院,长沙410083

出　　处：《振动与冲击》2018年第19期112-117,123,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51275165);长沙市科技计划重点项目(kh1701182);湖南省"十二五"重点建设学科资助项目(080204)

摘　　要：添加超声振动和微量Sr+Sc对A380合金进行变质处理,研究超声振动和微量Sr+Sc对A380合金显微组织和力学性能的影响及作用机理。结果表明:加入微量Sr+Sc与超声振动协同的作用使A380合金微观组织明显细化;加入0. 15%Sr+0. 3%Sc时,对组织的细化效果最理想,其晶粒尺寸最小,约为27μm,形状因子最大,为0. 8;此时硬度和伸长率最大,分别为:113 BHN和4. 7%;加入0. 2%Sr+0. 4%Sc时,强度最高,抗拉强度和屈服强度分别为:302 MPa和272 MPa。通过对A380合金熔体中超声空化场的仿真分析,探讨了超声波声流效应和空化效应对合金组织细化和力学性能提高的影响机理。Trace Sr+Sc and ultrasonic vibration(UV)were added in A380 alloy to implement modification processing and study effects and action mechanism of UV and trace Sr+Sc on microstructure and mechanical performance of A380 alloy.The results showed that the microstructure of A380 alloy can be refined significantly due to adding UV and trace Sr+Sc;the optimal refinement for the microstructure of A380 alloy is obtained when adding 0.15%Sr+0.3%Sc and UV,its grain size is the smallest(about 27μm)and its shape factor is the largest(about 0.8)with the highest hardness of 113BHN and the largest elongation of 4.7%;A380 alloy reaches the highest strength with its tensile strength of 302 MPa and its yield one of 272 MPa when adding 0.2%Sr+0.4%Sc and UV.Through simulation analysis of ultrasonic cavitation field in melted A380 alloy,the influence mechanism of ultrasonic acoustic flow effect and cavitation one on alloy microstructure refinement and improvement of mechanical performance was explored.

关 键 词：Sc+Sr变质 微观组织 超声波振动 力学性能 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3