论文部分内容阅读
利用连续挤压技术的单、双杆进料方法实验生产了尺寸(宽×厚,下同)为160 mm×8 mm,170 mm×4 mm和160mm×3 mm的AZ31镁合金板材。分析了单、双杆进料方式,不同宽/厚比和不同挤压速度等条件对镁合金板材横截面微观组织及力学性能的影响。讨论了应用双杆进料连续挤压工艺生产AZ31镁合金宽薄板的工艺可行性。结果表明:与单杆进料相比,双杆进料方式的连续挤压AZ31镁合金板材横截面微观组织均匀性较好,板材平均抗拉强度可达到239 MPa,平均延伸率为15%。宽/厚比由20增加到53,可获得晶粒尺寸5μm的细晶镁合金板材。随挤压轮转速提高,板材抗拉强度降低,这是由于温度升高导致晶粒尺寸变大所致。
The AZ31 magnesium alloy sheets with dimensions of 160 mm × 8 mm, 170 mm × 4 mm and 160 mm × 3 mm were manufactured by single-rod and double-rod feeding with continuous extrusion technology. The effects of single and double rod feeding method, different width / thickness ratio and different extrusion speed on the microstructure and mechanical properties of magnesium alloy sheet were analyzed. The feasibility of producing AZ31 magnesium alloy wide sheet by double-rod continuous extrusion process was discussed. The results show that the cross-sectional microstructure uniformity of AZ31 magnesium alloy sheet is better than that of single-rod feed. The average tensile strength of the sheet can reach 239 MPa and the average elongation is 15%. Width / thickness ratio increased from 20 to 53 to obtain a fine grain magnesium alloy plate having a grain size of 5 μm. With the extrusion wheel speed increases, sheet tensile strength decreases, which is due to the temperature increases lead to larger grain size due.