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采用粉末冶金法制备装甲用7039铝合金板材。原材料粉末经压制后挤压成板材。经T6热处理后,采用搅拌摩擦焊对板材进行双面焊接。研究焊接板的显微组织和显微硬度。结果表明,搅拌区的晶粒尺寸最小,硬度最低,分别为2~6μm和HV 80.9。为研究焊接板的弹道性能,采用7.62 mm穿甲弹对基体、热影响区、热力影响区+搅拌区进行射击,获得了这些区域的弹道极限值(v_(50))。基体、热力影响区+搅拌区和热影响区的弹道极限值(v_(50))分别比相同厚度普通板材的降低了14.7%、15.3%和17.9%。穿甲弹在装甲板上形成花瓣状和延性孔状失效。经挤压和颗粒增强后,热轧-冷轧可提高板材的弹道和力学性能。
Preparation of armored 7039 aluminum alloy sheet by powder metallurgy. The raw material powder is pressed and extruded into a sheet. After T6 heat treatment, using friction stir welding plate welding double-sided. Studied the microstructure and microhardness of welded plates. The results show that the stirring zone has the smallest grain size and the lowest hardness of 2 ~ 6μm and HV 80.9, respectively. In order to study the ballistic performance of the welded plate, the ballistic limit (v_ (50)) of these regions was obtained by shooting the base, the heat affected zone and the heat affected zone + the stirring zone with a 7.62 mm armor piercing bomb. The ballistic limit (v_ (50)) of the base, heat affected zone + stirring zone and heat affected zone were reduced by 14.7%, 15.3% and 17.9% respectively compared with those of the same thickness. Armor penetrators formed petal-like and ductile perforations on the armor plate. After extrusion and particle strengthening, hot-rolled cold-rolled sheet can improve the ballistic and mechanical properties.