超声振幅对电弧增材制造熔覆层微观组织及力学性能的影响  

Effects of ultrasonic amplitude on microstructure and mechanical properties of cladding layer in wire and arc additive manufacturing

作　　者：纪飞龙 秦训鹏[1,2] 华林[1,2] 胡泽启 倪茂 熊晓晨[1,2] JI Fei-long;QIN Xun-peng;HUA Lin;HU Ze-qi;NI Mao;XIONG Xiao-chen(School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《塑性工程学报》2022年第11期53-60,共8页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2018YFB1106500);湖北省技术创新重大项目(2020BED010)。

摘　　要：为提高增材件及修复件的性能,研究超声振幅对电弧增材制造微观组织及力学性能的影响,以低碳钢焊丝为填充材料,搭建了超声辅助电弧增材制造实验系统,采用不同超声振幅进行了单道单层及多道多层增材实验。结果表明,随着超声振幅的增加,熔覆层晶粒细化区域由熔池中心向周围扩展。当超声振幅为15μm时,晶粒细化区域面积占熔覆层横截面面积的94.3%,平均晶粒尺寸减小了67.2%,显微硬度提高了9.9%,伸长率降低了2.2%,屈服强度和抗拉强度分别提高了12.2%和11.1%。拉伸断口韧窝更加细小且分布更加均匀。超声的应用显著改善了电弧增材件的微观组织,粗大的柱状晶转变为细小的等轴晶,提高了电弧增材件的力学性能。To improve the performance of the additive and repair parts and study the effects of ultrasonic amplitude on the microstructure and mechanical properties of wire and arc additive manufacturing(WAAM),using the mild steel welding wire as filling material,an ultrasonic-assisted WAAM experiment system was established,and the single-pass single-layer and multi-pass multi-layer additive experiments were carried out with different ultrasonic amplitudes.The results show that with the increase of ultrasonic amplitude,the grain refinement region in cladding layer expands from the center of molten pool to the surrounding.When the ultrasonic amplitude is 15μm,the area of grain refinement region accounts for 94.3%of the area of cladding layer cross section,the average grain size decreases by 67.2%,the microhardness increases by 9.9%,the elongation decreases by 2.2%and the yield strength and tensile strength increase by 12.2%and 11.1%,respectively.The dimples of tensile fracture are smaller and distributed more evenly.The application of ultrasonic significantly improves the microstructure of the WAAM parts,the coarse columnar grain is transformed into fine equiaxed grain,and the mechanical properties of WAAM parts are improved.

关 键 词：电弧增材制造 超声辅助 微观组织 晶粒细化 力学性能 

分 类 号：TG455[金属学及工艺—焊接]