| 引用本文: | 何泽歆,王大鹏,周斌.超声振动作用下镁-钢焊缝组织演变及力学性能研究[J].材料科学与工艺,2022,30(4):79-85.DOI:10.11951/j.issn.1005-0299.20210273. |
| HE Zexin,WANG Dapeng,ZHOU Bin.Microstructure evolution and mechanical properties of Mg-steel weld subjected to ultrasonic vibration[J].Materials Science and Technology,2022,30(4):79-85.DOI:10.11951/j.issn.1005-0299.20210273. |
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| 摘要: |
| 本文旨在通过引入超声振动辅助,实现镁合金和镀锌钢的可靠连接,扩大镁-钢复合构件应用范围。本文在镁合金与镀锌钢的TIG熔钎焊过程中引入超声波振动,并通过金相显微镜、扫描电镜、硬度计和拉伸机等设备对镁-钢接头微观组织和力学性能进行检测,研究超声波功率对镁合金/镀锌钢接头质量的影响。实验结果表明:超声波振动辅助焊接工艺可以有效改善镁/钢接头的焊缝成形,消除接头熔焊区域的气孔等缺陷。研究表明:在焊接过程中引入1 000 W功率进行超声振动后,接头熔焊区的平均晶粒尺寸由初始的51 μm下降到23.2 μm,晶粒细化效果显著；超声振动辅助焊接工艺改善了接头钎焊区反应层的形态,使钎焊区MgZn反应层厚度更均匀,并可以提高接头熔焊区的显微硬度；当超声波功率为1 000 W时,接头力学性能达到3 735 N,相比未施加超声波振动的接头(3 270 N),力学性能提高了14.2%。超声振动辅助工艺可以有效改善镁/钢焊缝的显微组织,提高接头力学性能,实现镁/钢异种金属的可靠连接。 |
| 关键词: 金属材料的焊接 超声波 镁合金 钢 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20210273 |
| 分类号:TG457.1 |
| 文献标识码:A |
| 基金项目:重庆市教委科学技术研究项目(KJQN201904006). |
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| Microstructure evolution and mechanical properties of Mg-steel weld subjected to ultrasonic vibration |
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HE Zexin1, WANG Dapeng1, ZHOU Bin2
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(1.Institute of Intelligent Manufacturing and Automotive, Chongqing Technology and Business Institute, Chongqing 401520, China;2.Department of Automotive Engineering, Sichuan Instrument Industry School, Chongqing 400702, China)
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| Abstract: |
| To realize the reliable joining between Mg alloy and galvanized steel and expand the application scope of Mg-steel composite components, this paper attempts to introduce ultrasonic vibration in the TIG brazing process of Mg alloy and galvanized steel.The microstructure and mechanical properties of Mg-steel joints were tested by metallographic microscope, scanning electron microscope, hardness tester, and tensile machine, and the effect of ultrasonic power on Mg alloy/galvanized steel joints was studied.Results show that the ultrasonic vibration-assisted welding process could effectively improve the weld formation of Mg/steel joints and eliminate defects such as pores in the fusion welding area of the joint. When the ultrasonic vibration with a power of 1 000 W was introduced into the welding process, the average grain size of the joint welding area decreased from 51 μm to 23.2 μm, indicating remarkable grain refinement. The ultrasonic vibration-assisted welding process improved the morphology of the reaction layer in the brazing zone, and the thickness of MgZn reaction layer in the brazing zone was more uniform.The ultrasonic vibration assisting process could improve the microhardness of the fusion welding area of the joint. When the ultrasonic power was at 1 000 W, the mechanical performance of the joint reached 3 735 N, which was an increase of 14.2% compared with the joint without ultrasonic vibration (3 270 N).The results indicate that the ultrasonic vibration-assisted process can effectively improve the microstructure and mechanical properties of Mg/steel welds. |
| Key words: welding of metal materials ultrasonic magnesium steel mechanical properties |
