3003铝合金铸锭均匀化退火工艺及力学性能

Homogenizing annealing process and mechanical properties of 3003 aluminum alloy ingot

为了节能减排,利用光学显微镜、扫描电镜、万能力学试验机等手段,研究分析了3003铝合金不同均匀化退火工艺后的组织演变及力学性能变化。结果表明:随均匀化退火温度的升高,对应的最佳工艺时间减少;620℃下退火5 h时的组织与610℃下退火7 h时基本相同,晶界处无偏析第二相粒子且晶内弥散分布第二相粒子;常温及高温瞬时拉伸时,620℃退火5 h的合金拉伸强度、延伸率均高于610℃退火7 h的。该研究通过升高退火温度、减少时间改善了3003合金铸锭均匀化退火工艺,最佳工艺为650℃下保温5 h。

This paper deals with an investigation into homogenizing annealing process of 3003 aluminum alloy ingot to accomplish energy saving and emission reduction and use of optical microscopy and universal mechanical testing machine to examine the evolution of microstructures and the change of room tem- perature tensile and high temperature instantaneous tensile properties before and after homogenizing annealing of 3003 aluminum alloy ingot. The results indicate that the optimum annealing time depends on the annealing temperature. The increasing annealing temperature triggers decreasing optimum annealing time. The ingot after 5 h annealing at 620 ℃ has a basically same microstructure as that after 7 h annealing at 61. There occurs no segregation of second phase particles at grain boundary and transgranular disper- sive second phase particles were existed. Both room temperature tensile and high temperature instantaneous tensile produce a better tensile strength and elongation by 5 h annealing process at 620 ℃ than by 7 h annealing one at 610℃. It follows that a method of increasing temperature and decreasing time contributes to improving the homogenizing annealing process of 3003 aluminum alloy ingot. The optimistic homogenizing annealing process of 3003 aluminum alloy involves keeping the alloys annealed for 5 h at 650℃.