Al/SiC_p金属基复合材料搅拌摩擦焊工艺参数的多目标优化(英文)

Multi-objective optimization of friction stir welding parameters using desirability approach to join Al/SiC_p metal matrix composites

碳化硅颗粒(SiC_p)增强铸造铝基复合材料(MMC)在制造高比强、高温性能好和耐磨的轻质结构件中得到广泛应用。焊接接头的性能取决于搅拌摩擦焊(FSW)的工艺参数。研究铸造AA6061/20%SiC_p(体积分数)金属基复合材料焊接接头的抗拉强度、缺口拉伸强度和硬度,建立搅拌摩擦焊工艺参数(刀具转速、焊接速度和轴向力)与接头性能(抗拉强度、缺口拉伸强度和焊点硬度)之间的关系,确定最佳的焊接条件,以最大限度地提高接头的力学性能。结果表明,当搅拌针转速为1370 r/min、焊接速度为88.9 mm/min和轴向力为9.6 kN时,接头的最大抗拉强度、缺口拉伸强度和硬度分别为265 MPa、201 MPa和HV114。

Silicon carbide particulate （SiCp） reinforced cast aluminium （A1） based metal matrix composites （MMCs） have gained wide acceptance in the fabrication of light weight structures requiring high specific strength, high temperature capability and good wear resistance. Friction stir welding （FSW） process parameters play major role in deciding the performance of welded joints. The ultimate tensile strength, notch tensile strength and weld nugget hardness of friction stir butt welded joints of cast A1/SiCp MMCs （AA6061 with 20% （volume fraction） of SiCp） were investigated. The relationships between the FSW process parameters （rotational speed, welding speed and axial force） and the responses （ultimate tensile strength, notch tensile strength and weld nugget hardness） were established. The optimal welding parameters to maximize the mechanical properties were identified by using desirability approach. From this investigation, it is found that the joints fabricated with the tool rotational speed of 1370 r/min, welding speed of 88.9 mm/min, and axial force of 9.6 kN yield the maximum ultimate tensile strength, notch tensile strength and hardness of 265 MPa, 201 MPa and HV 114, respectively.