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采用双辊连铸连轧工艺制造出了1 mm厚的AZ31+1.0Y+1.3Sr镁合金板材,使用其板材气胀成形了正方形截面盒型壳体制件,并对其工艺进行了研究。采用光学显微镜和扫描电镜对制件进行了显微组织分析,探索了镁合金变形机理和最佳成形条件。通过对制件壁厚分布和空洞组织分析,探究了正方形截面壳体制件变形过程和断裂机理。结果表明,连铸连轧的AZ31+1.0Y+1.3Sr镁合金板材在400℃、1.8 MPa气体压力下成形的零件是饱满的。
A 1 mm thick AZ31 + 1.0Y + 1.3Sr magnesium alloy sheet was manufactured by the twin roll continuous casting and rolling process, and its sheet was swollen to form the square section box-type shell parts and the process was studied. The microstructure of the workpiece was analyzed by optical microscope and scanning electron microscope, and the deformation mechanism and the optimum forming conditions of the magnesium alloy were explored. Through the distribution of wall thickness and the analysis of hollow structure, the deformation process and fracture mechanism of the shell with square cross-section were explored. The results show that the part formed by AZ31 + 1.0Y + 1.3Sr magnesium alloy in continuous casting and rolling at 400 ℃ and 1.8 MPa gas pressure is full.