CAJ | 학술논문

目的：在保证搅拌速度一定时,针对8 mm厚的7 A52铝合金,在不同焊接速度下采用搅拌摩擦焊( FSW)进行焊接试验,研究其焊接接头的显微组织及力学性能。方法利用搅拌摩擦焊机进行对接焊接,焊后制取金相试样观察焊接接头宏观形貌和显微组织,并测定其力学性能。结果7 A52铝合金FSW焊接接头焊核区的面积随着焊接速度的增大而增大,当焊接速度为250 mm/min时,焊接接头的焊核区面积最大,焊核区的显微组织都为细小的等轴晶,焊接接头横截面的焊核区呈明显“洋葱环冶的形貌,而热力影响区的结构特征则呈现出了较高的塑性变形流线层。焊接接头显微硬度分布都呈现出“W冶形变化,在焊接速度为150 mm/min时,焊接接头的平均抗拉强度能达到452 MPa,达到了母材抗拉强度的89%。结论通过对不同焊接速度下7A52铝合金FSW焊接接头的组织和性能进行研究,得到了不同焊接速度下焊接接头组织和力学性能。
목적：재보증교반속도일정시,침대8 mm후적7 A52려합금,재불동한접속도하채용교반마찰한( FSW)진행한접시험,연구기한접접두적현미조직급역학성능。방법이용교반마찰한궤진행대접한접,한후제취금상시양관찰한접접두굉관형모화현미조직,병측정기역학성능。결과7 A52려합금FSW한접접두한핵구적면적수착한접속도적증대이증대,당한접속도위250 mm/min시,한접접두적한핵구면적최대,한핵구적현미조직도위세소적등축정,한접접두횡절면적한핵구정명현“양총배야적형모,이열력영향구적결구특정칙정현출료교고적소성변형류선층。한접접두현미경도분포도정현출“W야형변화,재한접속도위150 mm/min시,한접접두적평균항랍강도능체도452 MPa,체도료모재항랍강도적89%。결론통과대불동한접속도하7A52려합금FSW한접접두적조직화성능진행연구,득도료불동한접속도하한접접두조직화역학성능。
ABSTRACT:When the stirring speed was constant, the welding test for 7A52 alloy aluminum with a thickness of 8 mm was conducted using friction stir welding ( FSW) at different welding speeds. The microstructure and mechanical properties of welded joints were studied. The friction stir welding machine was used for butt welding, the metallographic specimen was made after welding to observe macro and microstructure of the welding joint, and its mechanical properties were also meas-ured. The area of 7A52 aluminum FSW welding joints in the welded zone increased as the welding speed increased, when the welding speed was 250 mm/min, the welding joint area was the biggest. The microstructure of welded zone was fine e-quiaxed crystal, the welded zone on the cross section of the welding joint showed obvious morphology of onion rings, and the structural features of the heat affected zone showed relatively high plastic deformation streamline. The distribution of the hardness of welded joints showed a "W" shape change. When the welding speed was 150 mm/min, the average tensile strength of welded joints was 452 MPa, reaching 89% of the tensile strength of the base material. In conclusion, the effects of different welding speeds of 7A52 aluminum alloy on the microstructure and the property of the friction stir-welding joint were studied. The microstructure and properties of welded joints at different welding speeds were obtained.